diff options
Diffstat (limited to 'contrib/llvm/lib/Target/ARM/ARMISelLowering.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/ARM/ARMISelLowering.cpp | 4886 |
1 files changed, 4886 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/ARM/ARMISelLowering.cpp b/contrib/llvm/lib/Target/ARM/ARMISelLowering.cpp new file mode 100644 index 0000000..b8126a3 --- /dev/null +++ b/contrib/llvm/lib/Target/ARM/ARMISelLowering.cpp @@ -0,0 +1,4886 @@ +//===-- ARMISelLowering.cpp - ARM DAG Lowering Implementation -------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file defines the interfaces that ARM uses to lower LLVM code into a +// selection DAG. +// +//===----------------------------------------------------------------------===// + +#include "ARM.h" +#include "ARMAddressingModes.h" +#include "ARMConstantPoolValue.h" +#include "ARMISelLowering.h" +#include "ARMMachineFunctionInfo.h" +#include "ARMPerfectShuffle.h" +#include "ARMRegisterInfo.h" +#include "ARMSubtarget.h" +#include "ARMTargetMachine.h" +#include "ARMTargetObjectFile.h" +#include "llvm/CallingConv.h" +#include "llvm/Constants.h" +#include "llvm/Function.h" +#include "llvm/GlobalValue.h" +#include "llvm/Instruction.h" +#include "llvm/Intrinsics.h" +#include "llvm/Type.h" +#include "llvm/CodeGen/CallingConvLower.h" +#include "llvm/CodeGen/MachineBasicBlock.h" +#include "llvm/CodeGen/MachineFrameInfo.h" +#include "llvm/CodeGen/MachineFunction.h" +#include "llvm/CodeGen/MachineInstrBuilder.h" +#include "llvm/CodeGen/MachineRegisterInfo.h" +#include "llvm/CodeGen/PseudoSourceValue.h" +#include "llvm/CodeGen/SelectionDAG.h" +#include "llvm/MC/MCSectionMachO.h" +#include "llvm/Target/TargetOptions.h" +#include "llvm/ADT/VectorExtras.h" +#include "llvm/Support/CommandLine.h" +#include "llvm/Support/ErrorHandling.h" +#include "llvm/Support/MathExtras.h" +#include "llvm/Support/raw_ostream.h" +#include <sstream> +using namespace llvm; + +static cl::opt<bool> +EnableARMLongCalls("arm-long-calls", cl::Hidden, + cl::desc("Generate calls via indirect call instructions."), + cl::init(false)); + +static bool CC_ARM_APCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT, + CCValAssign::LocInfo &LocInfo, + ISD::ArgFlagsTy &ArgFlags, + CCState &State); +static bool CC_ARM_AAPCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT, + CCValAssign::LocInfo &LocInfo, + ISD::ArgFlagsTy &ArgFlags, + CCState &State); +static bool RetCC_ARM_APCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT, + CCValAssign::LocInfo &LocInfo, + ISD::ArgFlagsTy &ArgFlags, + CCState &State); +static bool RetCC_ARM_AAPCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT, + CCValAssign::LocInfo &LocInfo, + ISD::ArgFlagsTy &ArgFlags, + CCState &State); + +void ARMTargetLowering::addTypeForNEON(EVT VT, EVT PromotedLdStVT, + EVT PromotedBitwiseVT) { + if (VT != PromotedLdStVT) { + setOperationAction(ISD::LOAD, VT.getSimpleVT(), Promote); + AddPromotedToType (ISD::LOAD, VT.getSimpleVT(), + PromotedLdStVT.getSimpleVT()); + + setOperationAction(ISD::STORE, VT.getSimpleVT(), Promote); + AddPromotedToType (ISD::STORE, VT.getSimpleVT(), + PromotedLdStVT.getSimpleVT()); + } + + EVT ElemTy = VT.getVectorElementType(); + if (ElemTy != MVT::i64 && ElemTy != MVT::f64) + setOperationAction(ISD::VSETCC, VT.getSimpleVT(), Custom); + if (ElemTy == MVT::i8 || ElemTy == MVT::i16) + setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT.getSimpleVT(), Custom); + if (ElemTy != MVT::i32) { + setOperationAction(ISD::SINT_TO_FP, VT.getSimpleVT(), Expand); + setOperationAction(ISD::UINT_TO_FP, VT.getSimpleVT(), Expand); + setOperationAction(ISD::FP_TO_SINT, VT.getSimpleVT(), Expand); + setOperationAction(ISD::FP_TO_UINT, VT.getSimpleVT(), Expand); + } + setOperationAction(ISD::BUILD_VECTOR, VT.getSimpleVT(), Custom); + setOperationAction(ISD::VECTOR_SHUFFLE, VT.getSimpleVT(), Custom); + if (llvm::ModelWithRegSequence()) + setOperationAction(ISD::CONCAT_VECTORS, VT.getSimpleVT(), Legal); + else + setOperationAction(ISD::CONCAT_VECTORS, VT.getSimpleVT(), Custom); + setOperationAction(ISD::EXTRACT_SUBVECTOR, VT.getSimpleVT(), Expand); + setOperationAction(ISD::SELECT, VT.getSimpleVT(), Expand); + setOperationAction(ISD::SELECT_CC, VT.getSimpleVT(), Expand); + if (VT.isInteger()) { + setOperationAction(ISD::SHL, VT.getSimpleVT(), Custom); + setOperationAction(ISD::SRA, VT.getSimpleVT(), Custom); + setOperationAction(ISD::SRL, VT.getSimpleVT(), Custom); + } + + // Promote all bit-wise operations. + if (VT.isInteger() && VT != PromotedBitwiseVT) { + setOperationAction(ISD::AND, VT.getSimpleVT(), Promote); + AddPromotedToType (ISD::AND, VT.getSimpleVT(), + PromotedBitwiseVT.getSimpleVT()); + setOperationAction(ISD::OR, VT.getSimpleVT(), Promote); + AddPromotedToType (ISD::OR, VT.getSimpleVT(), + PromotedBitwiseVT.getSimpleVT()); + setOperationAction(ISD::XOR, VT.getSimpleVT(), Promote); + AddPromotedToType (ISD::XOR, VT.getSimpleVT(), + PromotedBitwiseVT.getSimpleVT()); + } + + // Neon does not support vector divide/remainder operations. + setOperationAction(ISD::SDIV, VT.getSimpleVT(), Expand); + setOperationAction(ISD::UDIV, VT.getSimpleVT(), Expand); + setOperationAction(ISD::FDIV, VT.getSimpleVT(), Expand); + setOperationAction(ISD::SREM, VT.getSimpleVT(), Expand); + setOperationAction(ISD::UREM, VT.getSimpleVT(), Expand); + setOperationAction(ISD::FREM, VT.getSimpleVT(), Expand); +} + +void ARMTargetLowering::addDRTypeForNEON(EVT VT) { + addRegisterClass(VT, ARM::DPRRegisterClass); + addTypeForNEON(VT, MVT::f64, MVT::v2i32); +} + +void ARMTargetLowering::addQRTypeForNEON(EVT VT) { + addRegisterClass(VT, ARM::QPRRegisterClass); + addTypeForNEON(VT, MVT::v2f64, MVT::v4i32); +} + +static TargetLoweringObjectFile *createTLOF(TargetMachine &TM) { + if (TM.getSubtarget<ARMSubtarget>().isTargetDarwin()) + return new TargetLoweringObjectFileMachO(); + + return new ARMElfTargetObjectFile(); +} + +ARMTargetLowering::ARMTargetLowering(TargetMachine &TM) + : TargetLowering(TM, createTLOF(TM)) { + Subtarget = &TM.getSubtarget<ARMSubtarget>(); + + if (Subtarget->isTargetDarwin()) { + // Uses VFP for Thumb libfuncs if available. + if (Subtarget->isThumb() && Subtarget->hasVFP2()) { + // Single-precision floating-point arithmetic. + setLibcallName(RTLIB::ADD_F32, "__addsf3vfp"); + setLibcallName(RTLIB::SUB_F32, "__subsf3vfp"); + setLibcallName(RTLIB::MUL_F32, "__mulsf3vfp"); + setLibcallName(RTLIB::DIV_F32, "__divsf3vfp"); + + // Double-precision floating-point arithmetic. + setLibcallName(RTLIB::ADD_F64, "__adddf3vfp"); + setLibcallName(RTLIB::SUB_F64, "__subdf3vfp"); + setLibcallName(RTLIB::MUL_F64, "__muldf3vfp"); + setLibcallName(RTLIB::DIV_F64, "__divdf3vfp"); + + // Single-precision comparisons. + setLibcallName(RTLIB::OEQ_F32, "__eqsf2vfp"); + setLibcallName(RTLIB::UNE_F32, "__nesf2vfp"); + setLibcallName(RTLIB::OLT_F32, "__ltsf2vfp"); + setLibcallName(RTLIB::OLE_F32, "__lesf2vfp"); + setLibcallName(RTLIB::OGE_F32, "__gesf2vfp"); + setLibcallName(RTLIB::OGT_F32, "__gtsf2vfp"); + setLibcallName(RTLIB::UO_F32, "__unordsf2vfp"); + setLibcallName(RTLIB::O_F32, "__unordsf2vfp"); + + setCmpLibcallCC(RTLIB::OEQ_F32, ISD::SETNE); + setCmpLibcallCC(RTLIB::UNE_F32, ISD::SETNE); + setCmpLibcallCC(RTLIB::OLT_F32, ISD::SETNE); + setCmpLibcallCC(RTLIB::OLE_F32, ISD::SETNE); + setCmpLibcallCC(RTLIB::OGE_F32, ISD::SETNE); + setCmpLibcallCC(RTLIB::OGT_F32, ISD::SETNE); + setCmpLibcallCC(RTLIB::UO_F32, ISD::SETNE); + setCmpLibcallCC(RTLIB::O_F32, ISD::SETEQ); + + // Double-precision comparisons. + setLibcallName(RTLIB::OEQ_F64, "__eqdf2vfp"); + setLibcallName(RTLIB::UNE_F64, "__nedf2vfp"); + setLibcallName(RTLIB::OLT_F64, "__ltdf2vfp"); + setLibcallName(RTLIB::OLE_F64, "__ledf2vfp"); + setLibcallName(RTLIB::OGE_F64, "__gedf2vfp"); + setLibcallName(RTLIB::OGT_F64, "__gtdf2vfp"); + setLibcallName(RTLIB::UO_F64, "__unorddf2vfp"); + setLibcallName(RTLIB::O_F64, "__unorddf2vfp"); + + setCmpLibcallCC(RTLIB::OEQ_F64, ISD::SETNE); + setCmpLibcallCC(RTLIB::UNE_F64, ISD::SETNE); + setCmpLibcallCC(RTLIB::OLT_F64, ISD::SETNE); + setCmpLibcallCC(RTLIB::OLE_F64, ISD::SETNE); + setCmpLibcallCC(RTLIB::OGE_F64, ISD::SETNE); + setCmpLibcallCC(RTLIB::OGT_F64, ISD::SETNE); + setCmpLibcallCC(RTLIB::UO_F64, ISD::SETNE); + setCmpLibcallCC(RTLIB::O_F64, ISD::SETEQ); + + // Floating-point to integer conversions. + // i64 conversions are done via library routines even when generating VFP + // instructions, so use the same ones. + setLibcallName(RTLIB::FPTOSINT_F64_I32, "__fixdfsivfp"); + setLibcallName(RTLIB::FPTOUINT_F64_I32, "__fixunsdfsivfp"); + setLibcallName(RTLIB::FPTOSINT_F32_I32, "__fixsfsivfp"); + setLibcallName(RTLIB::FPTOUINT_F32_I32, "__fixunssfsivfp"); + + // Conversions between floating types. + setLibcallName(RTLIB::FPROUND_F64_F32, "__truncdfsf2vfp"); + setLibcallName(RTLIB::FPEXT_F32_F64, "__extendsfdf2vfp"); + + // Integer to floating-point conversions. + // i64 conversions are done via library routines even when generating VFP + // instructions, so use the same ones. + // FIXME: There appears to be some naming inconsistency in ARM libgcc: + // e.g., __floatunsidf vs. __floatunssidfvfp. + setLibcallName(RTLIB::SINTTOFP_I32_F64, "__floatsidfvfp"); + setLibcallName(RTLIB::UINTTOFP_I32_F64, "__floatunssidfvfp"); + setLibcallName(RTLIB::SINTTOFP_I32_F32, "__floatsisfvfp"); + setLibcallName(RTLIB::UINTTOFP_I32_F32, "__floatunssisfvfp"); + } + } + + // These libcalls are not available in 32-bit. + setLibcallName(RTLIB::SHL_I128, 0); + setLibcallName(RTLIB::SRL_I128, 0); + setLibcallName(RTLIB::SRA_I128, 0); + + // Libcalls should use the AAPCS base standard ABI, even if hard float + // is in effect, as per the ARM RTABI specification, section 4.1.2. + if (Subtarget->isAAPCS_ABI()) { + for (int i = 0; i < RTLIB::UNKNOWN_LIBCALL; ++i) { + setLibcallCallingConv(static_cast<RTLIB::Libcall>(i), + CallingConv::ARM_AAPCS); + } + } + + if (Subtarget->isThumb1Only()) + addRegisterClass(MVT::i32, ARM::tGPRRegisterClass); + else + addRegisterClass(MVT::i32, ARM::GPRRegisterClass); + if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only()) { + addRegisterClass(MVT::f32, ARM::SPRRegisterClass); + addRegisterClass(MVT::f64, ARM::DPRRegisterClass); + + setTruncStoreAction(MVT::f64, MVT::f32, Expand); + } + + if (Subtarget->hasNEON()) { + addDRTypeForNEON(MVT::v2f32); + addDRTypeForNEON(MVT::v8i8); + addDRTypeForNEON(MVT::v4i16); + addDRTypeForNEON(MVT::v2i32); + addDRTypeForNEON(MVT::v1i64); + + addQRTypeForNEON(MVT::v4f32); + addQRTypeForNEON(MVT::v2f64); + addQRTypeForNEON(MVT::v16i8); + addQRTypeForNEON(MVT::v8i16); + addQRTypeForNEON(MVT::v4i32); + addQRTypeForNEON(MVT::v2i64); + + // v2f64 is legal so that QR subregs can be extracted as f64 elements, but + // neither Neon nor VFP support any arithmetic operations on it. + setOperationAction(ISD::FADD, MVT::v2f64, Expand); + setOperationAction(ISD::FSUB, MVT::v2f64, Expand); + setOperationAction(ISD::FMUL, MVT::v2f64, Expand); + setOperationAction(ISD::FDIV, MVT::v2f64, Expand); + setOperationAction(ISD::FREM, MVT::v2f64, Expand); + setOperationAction(ISD::FCOPYSIGN, MVT::v2f64, Expand); + setOperationAction(ISD::VSETCC, MVT::v2f64, Expand); + setOperationAction(ISD::FNEG, MVT::v2f64, Expand); + setOperationAction(ISD::FABS, MVT::v2f64, Expand); + setOperationAction(ISD::FSQRT, MVT::v2f64, Expand); + setOperationAction(ISD::FSIN, MVT::v2f64, Expand); + setOperationAction(ISD::FCOS, MVT::v2f64, Expand); + setOperationAction(ISD::FPOWI, MVT::v2f64, Expand); + setOperationAction(ISD::FPOW, MVT::v2f64, Expand); + setOperationAction(ISD::FLOG, MVT::v2f64, Expand); + setOperationAction(ISD::FLOG2, MVT::v2f64, Expand); + setOperationAction(ISD::FLOG10, MVT::v2f64, Expand); + setOperationAction(ISD::FEXP, MVT::v2f64, Expand); + setOperationAction(ISD::FEXP2, MVT::v2f64, Expand); + setOperationAction(ISD::FCEIL, MVT::v2f64, Expand); + setOperationAction(ISD::FTRUNC, MVT::v2f64, Expand); + setOperationAction(ISD::FRINT, MVT::v2f64, Expand); + setOperationAction(ISD::FNEARBYINT, MVT::v2f64, Expand); + setOperationAction(ISD::FFLOOR, MVT::v2f64, Expand); + + // Neon does not support some operations on v1i64 and v2i64 types. + setOperationAction(ISD::MUL, MVT::v1i64, Expand); + setOperationAction(ISD::MUL, MVT::v2i64, Expand); + setOperationAction(ISD::VSETCC, MVT::v1i64, Expand); + setOperationAction(ISD::VSETCC, MVT::v2i64, Expand); + + setTargetDAGCombine(ISD::INTRINSIC_WO_CHAIN); + setTargetDAGCombine(ISD::SHL); + setTargetDAGCombine(ISD::SRL); + setTargetDAGCombine(ISD::SRA); + setTargetDAGCombine(ISD::SIGN_EXTEND); + setTargetDAGCombine(ISD::ZERO_EXTEND); + setTargetDAGCombine(ISD::ANY_EXTEND); + setTargetDAGCombine(ISD::SELECT_CC); + } + + computeRegisterProperties(); + + // ARM does not have f32 extending load. + setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand); + + // ARM does not have i1 sign extending load. + setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote); + + // ARM supports all 4 flavors of integer indexed load / store. + if (!Subtarget->isThumb1Only()) { + for (unsigned im = (unsigned)ISD::PRE_INC; + im != (unsigned)ISD::LAST_INDEXED_MODE; ++im) { + setIndexedLoadAction(im, MVT::i1, Legal); + setIndexedLoadAction(im, MVT::i8, Legal); + setIndexedLoadAction(im, MVT::i16, Legal); + setIndexedLoadAction(im, MVT::i32, Legal); + setIndexedStoreAction(im, MVT::i1, Legal); + setIndexedStoreAction(im, MVT::i8, Legal); + setIndexedStoreAction(im, MVT::i16, Legal); + setIndexedStoreAction(im, MVT::i32, Legal); + } + } + + // i64 operation support. + if (Subtarget->isThumb1Only()) { + setOperationAction(ISD::MUL, MVT::i64, Expand); + setOperationAction(ISD::MULHU, MVT::i32, Expand); + setOperationAction(ISD::MULHS, MVT::i32, Expand); + setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand); + setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand); + } else { + setOperationAction(ISD::MUL, MVT::i64, Expand); + setOperationAction(ISD::MULHU, MVT::i32, Expand); + if (!Subtarget->hasV6Ops()) + setOperationAction(ISD::MULHS, MVT::i32, Expand); + } + setOperationAction(ISD::SHL_PARTS, MVT::i32, Custom); + setOperationAction(ISD::SRA_PARTS, MVT::i32, Custom); + setOperationAction(ISD::SRL_PARTS, MVT::i32, Custom); + setOperationAction(ISD::SRL, MVT::i64, Custom); + setOperationAction(ISD::SRA, MVT::i64, Custom); + + // ARM does not have ROTL. + setOperationAction(ISD::ROTL, MVT::i32, Expand); + setOperationAction(ISD::CTTZ, MVT::i32, Custom); + setOperationAction(ISD::CTPOP, MVT::i32, Expand); + if (!Subtarget->hasV5TOps() || Subtarget->isThumb1Only()) + setOperationAction(ISD::CTLZ, MVT::i32, Expand); + + // Only ARMv6 has BSWAP. + if (!Subtarget->hasV6Ops()) + setOperationAction(ISD::BSWAP, MVT::i32, Expand); + + // These are expanded into libcalls. + if (!Subtarget->hasDivide()) { + // v7M has a hardware divider + setOperationAction(ISD::SDIV, MVT::i32, Expand); + setOperationAction(ISD::UDIV, MVT::i32, Expand); + } + setOperationAction(ISD::SREM, MVT::i32, Expand); + setOperationAction(ISD::UREM, MVT::i32, Expand); + setOperationAction(ISD::SDIVREM, MVT::i32, Expand); + setOperationAction(ISD::UDIVREM, MVT::i32, Expand); + + setOperationAction(ISD::GlobalAddress, MVT::i32, Custom); + setOperationAction(ISD::ConstantPool, MVT::i32, Custom); + setOperationAction(ISD::GLOBAL_OFFSET_TABLE, MVT::i32, Custom); + setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom); + setOperationAction(ISD::BlockAddress, MVT::i32, Custom); + + setOperationAction(ISD::TRAP, MVT::Other, Legal); + + // Use the default implementation. + setOperationAction(ISD::VASTART, MVT::Other, Custom); + setOperationAction(ISD::VAARG, MVT::Other, Expand); + setOperationAction(ISD::VACOPY, MVT::Other, Expand); + setOperationAction(ISD::VAEND, MVT::Other, Expand); + setOperationAction(ISD::STACKSAVE, MVT::Other, Expand); + setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand); + setOperationAction(ISD::EHSELECTION, MVT::i32, Expand); + // FIXME: Shouldn't need this, since no register is used, but the legalizer + // doesn't yet know how to not do that for SjLj. + setExceptionSelectorRegister(ARM::R0); + setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand); + setOperationAction(ISD::MEMBARRIER, MVT::Other, Custom); + + // If the subtarget does not have extract instructions, sign_extend_inreg + // needs to be expanded. Extract is available in ARM mode on v6 and up, + // and on most Thumb2 implementations. + if ((!Subtarget->isThumb() && !Subtarget->hasV6Ops()) + || (Subtarget->isThumb2() && !Subtarget->hasT2ExtractPack())) { + setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand); + setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8, Expand); + } + setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand); + + if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only()) + // Turn f64->i64 into VMOVRRD, i64 -> f64 to VMOVDRR + // iff target supports vfp2. + setOperationAction(ISD::BIT_CONVERT, MVT::i64, Custom); + + // We want to custom lower some of our intrinsics. + setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom); + setOperationAction(ISD::EH_SJLJ_SETJMP, MVT::i32, Custom); + setOperationAction(ISD::EH_SJLJ_LONGJMP, MVT::Other, Custom); + + setOperationAction(ISD::SETCC, MVT::i32, Expand); + setOperationAction(ISD::SETCC, MVT::f32, Expand); + setOperationAction(ISD::SETCC, MVT::f64, Expand); + setOperationAction(ISD::SELECT, MVT::i32, Expand); + setOperationAction(ISD::SELECT, MVT::f32, Expand); + setOperationAction(ISD::SELECT, MVT::f64, Expand); + setOperationAction(ISD::SELECT_CC, MVT::i32, Custom); + setOperationAction(ISD::SELECT_CC, MVT::f32, Custom); + setOperationAction(ISD::SELECT_CC, MVT::f64, Custom); + + setOperationAction(ISD::BRCOND, MVT::Other, Expand); + setOperationAction(ISD::BR_CC, MVT::i32, Custom); + setOperationAction(ISD::BR_CC, MVT::f32, Custom); + setOperationAction(ISD::BR_CC, MVT::f64, Custom); + setOperationAction(ISD::BR_JT, MVT::Other, Custom); + + // We don't support sin/cos/fmod/copysign/pow + setOperationAction(ISD::FSIN, MVT::f64, Expand); + setOperationAction(ISD::FSIN, MVT::f32, Expand); + setOperationAction(ISD::FCOS, MVT::f32, Expand); + setOperationAction(ISD::FCOS, MVT::f64, Expand); + setOperationAction(ISD::FREM, MVT::f64, Expand); + setOperationAction(ISD::FREM, MVT::f32, Expand); + if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only()) { + setOperationAction(ISD::FCOPYSIGN, MVT::f64, Custom); + setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom); + } + setOperationAction(ISD::FPOW, MVT::f64, Expand); + setOperationAction(ISD::FPOW, MVT::f32, Expand); + + // Various VFP goodness + if (!UseSoftFloat && !Subtarget->isThumb1Only()) { + // int <-> fp are custom expanded into bit_convert + ARMISD ops. + if (Subtarget->hasVFP2()) { + setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom); + setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom); + setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom); + setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom); + } + // Special handling for half-precision FP. + if (!Subtarget->hasFP16()) { + setOperationAction(ISD::FP16_TO_FP32, MVT::f32, Expand); + setOperationAction(ISD::FP32_TO_FP16, MVT::i32, Expand); + } + } + + // We have target-specific dag combine patterns for the following nodes: + // ARMISD::VMOVRRD - No need to call setTargetDAGCombine + setTargetDAGCombine(ISD::ADD); + setTargetDAGCombine(ISD::SUB); + setTargetDAGCombine(ISD::MUL); + + setStackPointerRegisterToSaveRestore(ARM::SP); + + if (UseSoftFloat || Subtarget->isThumb1Only() || !Subtarget->hasVFP2()) + setSchedulingPreference(Sched::RegPressure); + else + setSchedulingPreference(Sched::Hybrid); + + // FIXME: If-converter should use instruction latency to determine + // profitability rather than relying on fixed limits. + if (Subtarget->getCPUString() == "generic") { + // Generic (and overly aggressive) if-conversion limits. + setIfCvtBlockSizeLimit(10); + setIfCvtDupBlockSizeLimit(2); + } else if (Subtarget->hasV7Ops()) { + setIfCvtBlockSizeLimit(3); + setIfCvtDupBlockSizeLimit(1); + } else if (Subtarget->hasV6Ops()) { + setIfCvtBlockSizeLimit(2); + setIfCvtDupBlockSizeLimit(1); + } else { + setIfCvtBlockSizeLimit(3); + setIfCvtDupBlockSizeLimit(2); + } + + maxStoresPerMemcpy = 1; //// temporary - rewrite interface to use type + // Do not enable CodePlacementOpt for now: it currently runs after the + // ARMConstantIslandPass and messes up branch relaxation and placement + // of constant islands. + // benefitFromCodePlacementOpt = true; +} + +const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const { + switch (Opcode) { + default: return 0; + case ARMISD::Wrapper: return "ARMISD::Wrapper"; + case ARMISD::WrapperJT: return "ARMISD::WrapperJT"; + case ARMISD::CALL: return "ARMISD::CALL"; + case ARMISD::CALL_PRED: return "ARMISD::CALL_PRED"; + case ARMISD::CALL_NOLINK: return "ARMISD::CALL_NOLINK"; + case ARMISD::tCALL: return "ARMISD::tCALL"; + case ARMISD::BRCOND: return "ARMISD::BRCOND"; + case ARMISD::BR_JT: return "ARMISD::BR_JT"; + case ARMISD::BR2_JT: return "ARMISD::BR2_JT"; + case ARMISD::RET_FLAG: return "ARMISD::RET_FLAG"; + case ARMISD::PIC_ADD: return "ARMISD::PIC_ADD"; + case ARMISD::CMP: return "ARMISD::CMP"; + case ARMISD::CMPZ: return "ARMISD::CMPZ"; + case ARMISD::CMPFP: return "ARMISD::CMPFP"; + case ARMISD::CMPFPw0: return "ARMISD::CMPFPw0"; + case ARMISD::FMSTAT: return "ARMISD::FMSTAT"; + case ARMISD::CMOV: return "ARMISD::CMOV"; + case ARMISD::CNEG: return "ARMISD::CNEG"; + + case ARMISD::RBIT: return "ARMISD::RBIT"; + + case ARMISD::FTOSI: return "ARMISD::FTOSI"; + case ARMISD::FTOUI: return "ARMISD::FTOUI"; + case ARMISD::SITOF: return "ARMISD::SITOF"; + case ARMISD::UITOF: return "ARMISD::UITOF"; + + case ARMISD::SRL_FLAG: return "ARMISD::SRL_FLAG"; + case ARMISD::SRA_FLAG: return "ARMISD::SRA_FLAG"; + case ARMISD::RRX: return "ARMISD::RRX"; + + case ARMISD::VMOVRRD: return "ARMISD::VMOVRRD"; + case ARMISD::VMOVDRR: return "ARMISD::VMOVDRR"; + + case ARMISD::EH_SJLJ_SETJMP: return "ARMISD::EH_SJLJ_SETJMP"; + case ARMISD::EH_SJLJ_LONGJMP:return "ARMISD::EH_SJLJ_LONGJMP"; + + case ARMISD::THREAD_POINTER:return "ARMISD::THREAD_POINTER"; + + case ARMISD::DYN_ALLOC: return "ARMISD::DYN_ALLOC"; + + case ARMISD::MEMBARRIER: return "ARMISD::MEMBARRIER"; + case ARMISD::SYNCBARRIER: return "ARMISD::SYNCBARRIER"; + + case ARMISD::VCEQ: return "ARMISD::VCEQ"; + case ARMISD::VCGE: return "ARMISD::VCGE"; + case ARMISD::VCGEU: return "ARMISD::VCGEU"; + case ARMISD::VCGT: return "ARMISD::VCGT"; + case ARMISD::VCGTU: return "ARMISD::VCGTU"; + case ARMISD::VTST: return "ARMISD::VTST"; + + case ARMISD::VSHL: return "ARMISD::VSHL"; + case ARMISD::VSHRs: return "ARMISD::VSHRs"; + case ARMISD::VSHRu: return "ARMISD::VSHRu"; + case ARMISD::VSHLLs: return "ARMISD::VSHLLs"; + case ARMISD::VSHLLu: return "ARMISD::VSHLLu"; + case ARMISD::VSHLLi: return "ARMISD::VSHLLi"; + case ARMISD::VSHRN: return "ARMISD::VSHRN"; + case ARMISD::VRSHRs: return "ARMISD::VRSHRs"; + case ARMISD::VRSHRu: return "ARMISD::VRSHRu"; + case ARMISD::VRSHRN: return "ARMISD::VRSHRN"; + case ARMISD::VQSHLs: return "ARMISD::VQSHLs"; + case ARMISD::VQSHLu: return "ARMISD::VQSHLu"; + case ARMISD::VQSHLsu: return "ARMISD::VQSHLsu"; + case ARMISD::VQSHRNs: return "ARMISD::VQSHRNs"; + case ARMISD::VQSHRNu: return "ARMISD::VQSHRNu"; + case ARMISD::VQSHRNsu: return "ARMISD::VQSHRNsu"; + case ARMISD::VQRSHRNs: return "ARMISD::VQRSHRNs"; + case ARMISD::VQRSHRNu: return "ARMISD::VQRSHRNu"; + case ARMISD::VQRSHRNsu: return "ARMISD::VQRSHRNsu"; + case ARMISD::VGETLANEu: return "ARMISD::VGETLANEu"; + case ARMISD::VGETLANEs: return "ARMISD::VGETLANEs"; + case ARMISD::VDUP: return "ARMISD::VDUP"; + case ARMISD::VDUPLANE: return "ARMISD::VDUPLANE"; + case ARMISD::VEXT: return "ARMISD::VEXT"; + case ARMISD::VREV64: return "ARMISD::VREV64"; + case ARMISD::VREV32: return "ARMISD::VREV32"; + case ARMISD::VREV16: return "ARMISD::VREV16"; + case ARMISD::VZIP: return "ARMISD::VZIP"; + case ARMISD::VUZP: return "ARMISD::VUZP"; + case ARMISD::VTRN: return "ARMISD::VTRN"; + case ARMISD::FMAX: return "ARMISD::FMAX"; + case ARMISD::FMIN: return "ARMISD::FMIN"; + } +} + +/// getRegClassFor - Return the register class that should be used for the +/// specified value type. +TargetRegisterClass *ARMTargetLowering::getRegClassFor(EVT VT) const { + // Map v4i64 to QQ registers but do not make the type legal. Similarly map + // v8i64 to QQQQ registers. v4i64 and v8i64 are only used for REG_SEQUENCE to + // load / store 4 to 8 consecutive D registers. + if (Subtarget->hasNEON()) { + if (VT == MVT::v4i64) + return ARM::QQPRRegisterClass; + else if (VT == MVT::v8i64) + return ARM::QQQQPRRegisterClass; + } + return TargetLowering::getRegClassFor(VT); +} + +/// getFunctionAlignment - Return the Log2 alignment of this function. +unsigned ARMTargetLowering::getFunctionAlignment(const Function *F) const { + return getTargetMachine().getSubtarget<ARMSubtarget>().isThumb() ? 0 : 1; +} + +Sched::Preference ARMTargetLowering::getSchedulingPreference(SDNode *N) const { + for (unsigned i = 0, e = N->getNumValues(); i != e; ++i) { + EVT VT = N->getValueType(i); + if (VT.isFloatingPoint() || VT.isVector()) + return Sched::Latency; + } + return Sched::RegPressure; +} + +//===----------------------------------------------------------------------===// +// Lowering Code +//===----------------------------------------------------------------------===// + +/// IntCCToARMCC - Convert a DAG integer condition code to an ARM CC +static ARMCC::CondCodes IntCCToARMCC(ISD::CondCode CC) { + switch (CC) { + default: llvm_unreachable("Unknown condition code!"); + case ISD::SETNE: return ARMCC::NE; + case ISD::SETEQ: return ARMCC::EQ; + case ISD::SETGT: return ARMCC::GT; + case ISD::SETGE: return ARMCC::GE; + case ISD::SETLT: return ARMCC::LT; + case ISD::SETLE: return ARMCC::LE; + case ISD::SETUGT: return ARMCC::HI; + case ISD::SETUGE: return ARMCC::HS; + case ISD::SETULT: return ARMCC::LO; + case ISD::SETULE: return ARMCC::LS; + } +} + +/// FPCCToARMCC - Convert a DAG fp condition code to an ARM CC. +static void FPCCToARMCC(ISD::CondCode CC, ARMCC::CondCodes &CondCode, + ARMCC::CondCodes &CondCode2) { + CondCode2 = ARMCC::AL; + switch (CC) { + default: llvm_unreachable("Unknown FP condition!"); + case ISD::SETEQ: + case ISD::SETOEQ: CondCode = ARMCC::EQ; break; + case ISD::SETGT: + case ISD::SETOGT: CondCode = ARMCC::GT; break; + case ISD::SETGE: + case ISD::SETOGE: CondCode = ARMCC::GE; break; + case ISD::SETOLT: CondCode = ARMCC::MI; break; + case ISD::SETOLE: CondCode = ARMCC::LS; break; + case ISD::SETONE: CondCode = ARMCC::MI; CondCode2 = ARMCC::GT; break; + case ISD::SETO: CondCode = ARMCC::VC; break; + case ISD::SETUO: CondCode = ARMCC::VS; break; + case ISD::SETUEQ: CondCode = ARMCC::EQ; CondCode2 = ARMCC::VS; break; + case ISD::SETUGT: CondCode = ARMCC::HI; break; + case ISD::SETUGE: CondCode = ARMCC::PL; break; + case ISD::SETLT: + case ISD::SETULT: CondCode = ARMCC::LT; break; + case ISD::SETLE: + case ISD::SETULE: CondCode = ARMCC::LE; break; + case ISD::SETNE: + case ISD::SETUNE: CondCode = ARMCC::NE; break; + } +} + +//===----------------------------------------------------------------------===// +// Calling Convention Implementation +//===----------------------------------------------------------------------===// + +#include "ARMGenCallingConv.inc" + +// APCS f64 is in register pairs, possibly split to stack +static bool f64AssignAPCS(unsigned &ValNo, EVT &ValVT, EVT &LocVT, + CCValAssign::LocInfo &LocInfo, + CCState &State, bool CanFail) { + static const unsigned RegList[] = { ARM::R0, ARM::R1, ARM::R2, ARM::R3 }; + + // Try to get the first register. + if (unsigned Reg = State.AllocateReg(RegList, 4)) + State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo)); + else { + // For the 2nd half of a v2f64, do not fail. + if (CanFail) + return false; + + // Put the whole thing on the stack. + State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT, + State.AllocateStack(8, 4), + LocVT, LocInfo)); + return true; + } + + // Try to get the second register. + if (unsigned Reg = State.AllocateReg(RegList, 4)) + State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo)); + else + State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT, + State.AllocateStack(4, 4), + LocVT, LocInfo)); + return true; +} + +static bool CC_ARM_APCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT, + CCValAssign::LocInfo &LocInfo, + ISD::ArgFlagsTy &ArgFlags, + CCState &State) { + if (!f64AssignAPCS(ValNo, ValVT, LocVT, LocInfo, State, true)) + return false; + if (LocVT == MVT::v2f64 && + !f64AssignAPCS(ValNo, ValVT, LocVT, LocInfo, State, false)) + return false; + return true; // we handled it +} + +// AAPCS f64 is in aligned register pairs +static bool f64AssignAAPCS(unsigned &ValNo, EVT &ValVT, EVT &LocVT, + CCValAssign::LocInfo &LocInfo, + CCState &State, bool CanFail) { + static const unsigned HiRegList[] = { ARM::R0, ARM::R2 }; + static const unsigned LoRegList[] = { ARM::R1, ARM::R3 }; + + unsigned Reg = State.AllocateReg(HiRegList, LoRegList, 2); + if (Reg == 0) { + // For the 2nd half of a v2f64, do not just fail. + if (CanFail) + return false; + + // Put the whole thing on the stack. + State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT, + State.AllocateStack(8, 8), + LocVT, LocInfo)); + return true; + } + + unsigned i; + for (i = 0; i < 2; ++i) + if (HiRegList[i] == Reg) + break; + + State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo)); + State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, LoRegList[i], + LocVT, LocInfo)); + return true; +} + +static bool CC_ARM_AAPCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT, + CCValAssign::LocInfo &LocInfo, + ISD::ArgFlagsTy &ArgFlags, + CCState &State) { + if (!f64AssignAAPCS(ValNo, ValVT, LocVT, LocInfo, State, true)) + return false; + if (LocVT == MVT::v2f64 && + !f64AssignAAPCS(ValNo, ValVT, LocVT, LocInfo, State, false)) + return false; + return true; // we handled it +} + +static bool f64RetAssign(unsigned &ValNo, EVT &ValVT, EVT &LocVT, + CCValAssign::LocInfo &LocInfo, CCState &State) { + static const unsigned HiRegList[] = { ARM::R0, ARM::R2 }; + static const unsigned LoRegList[] = { ARM::R1, ARM::R3 }; + + unsigned Reg = State.AllocateReg(HiRegList, LoRegList, 2); + if (Reg == 0) + return false; // we didn't handle it + + unsigned i; + for (i = 0; i < 2; ++i) + if (HiRegList[i] == Reg) + break; + + State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo)); + State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, LoRegList[i], + LocVT, LocInfo)); + return true; +} + +static bool RetCC_ARM_APCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT, + CCValAssign::LocInfo &LocInfo, + ISD::ArgFlagsTy &ArgFlags, + CCState &State) { + if (!f64RetAssign(ValNo, ValVT, LocVT, LocInfo, State)) + return false; + if (LocVT == MVT::v2f64 && !f64RetAssign(ValNo, ValVT, LocVT, LocInfo, State)) + return false; + return true; // we handled it +} + +static bool RetCC_ARM_AAPCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT, + CCValAssign::LocInfo &LocInfo, + ISD::ArgFlagsTy &ArgFlags, + CCState &State) { + return RetCC_ARM_APCS_Custom_f64(ValNo, ValVT, LocVT, LocInfo, ArgFlags, + State); +} + +/// CCAssignFnForNode - Selects the correct CCAssignFn for a the +/// given CallingConvention value. +CCAssignFn *ARMTargetLowering::CCAssignFnForNode(CallingConv::ID CC, + bool Return, + bool isVarArg) const { + switch (CC) { + default: + llvm_unreachable("Unsupported calling convention"); + case CallingConv::C: + case CallingConv::Fast: + // Use target triple & subtarget features to do actual dispatch. + if (Subtarget->isAAPCS_ABI()) { + if (Subtarget->hasVFP2() && + FloatABIType == FloatABI::Hard && !isVarArg) + return (Return ? RetCC_ARM_AAPCS_VFP: CC_ARM_AAPCS_VFP); + else + return (Return ? RetCC_ARM_AAPCS: CC_ARM_AAPCS); + } else + return (Return ? RetCC_ARM_APCS: CC_ARM_APCS); + case CallingConv::ARM_AAPCS_VFP: + return (Return ? RetCC_ARM_AAPCS_VFP: CC_ARM_AAPCS_VFP); + case CallingConv::ARM_AAPCS: + return (Return ? RetCC_ARM_AAPCS: CC_ARM_AAPCS); + case CallingConv::ARM_APCS: + return (Return ? RetCC_ARM_APCS: CC_ARM_APCS); + } +} + +/// LowerCallResult - Lower the result values of a call into the +/// appropriate copies out of appropriate physical registers. +SDValue +ARMTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag, + CallingConv::ID CallConv, bool isVarArg, + const SmallVectorImpl<ISD::InputArg> &Ins, + DebugLoc dl, SelectionDAG &DAG, + SmallVectorImpl<SDValue> &InVals) const { + + // Assign locations to each value returned by this call. + SmallVector<CCValAssign, 16> RVLocs; + CCState CCInfo(CallConv, isVarArg, getTargetMachine(), + RVLocs, *DAG.getContext()); + CCInfo.AnalyzeCallResult(Ins, + CCAssignFnForNode(CallConv, /* Return*/ true, + isVarArg)); + + // Copy all of the result registers out of their specified physreg. + for (unsigned i = 0; i != RVLocs.size(); ++i) { + CCValAssign VA = RVLocs[i]; + + SDValue Val; + if (VA.needsCustom()) { + // Handle f64 or half of a v2f64. + SDValue Lo = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32, + InFlag); + Chain = Lo.getValue(1); + InFlag = Lo.getValue(2); + VA = RVLocs[++i]; // skip ahead to next loc + SDValue Hi = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32, + InFlag); + Chain = Hi.getValue(1); + InFlag = Hi.getValue(2); + Val = DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi); + + if (VA.getLocVT() == MVT::v2f64) { + SDValue Vec = DAG.getNode(ISD::UNDEF, dl, MVT::v2f64); + Vec = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Vec, Val, + DAG.getConstant(0, MVT::i32)); + + VA = RVLocs[++i]; // skip ahead to next loc + Lo = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32, InFlag); + Chain = Lo.getValue(1); + InFlag = Lo.getValue(2); + VA = RVLocs[++i]; // skip ahead to next loc + Hi = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32, InFlag); + Chain = Hi.getValue(1); + InFlag = Hi.getValue(2); + Val = DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi); + Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Vec, Val, + DAG.getConstant(1, MVT::i32)); + } + } else { + Val = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), VA.getLocVT(), + InFlag); + Chain = Val.getValue(1); + InFlag = Val.getValue(2); + } + + switch (VA.getLocInfo()) { + default: llvm_unreachable("Unknown loc info!"); + case CCValAssign::Full: break; + case CCValAssign::BCvt: + Val = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getValVT(), Val); + break; + } + + InVals.push_back(Val); + } + + return Chain; +} + +/// CreateCopyOfByValArgument - Make a copy of an aggregate at address specified +/// by "Src" to address "Dst" of size "Size". Alignment information is +/// specified by the specific parameter attribute. The copy will be passed as +/// a byval function parameter. +/// Sometimes what we are copying is the end of a larger object, the part that +/// does not fit in registers. +static SDValue +CreateCopyOfByValArgument(SDValue Src, SDValue Dst, SDValue Chain, + ISD::ArgFlagsTy Flags, SelectionDAG &DAG, + DebugLoc dl) { + SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), MVT::i32); + return DAG.getMemcpy(Chain, dl, Dst, Src, SizeNode, Flags.getByValAlign(), + /*isVolatile=*/false, /*AlwaysInline=*/false, + NULL, 0, NULL, 0); +} + +/// LowerMemOpCallTo - Store the argument to the stack. +SDValue +ARMTargetLowering::LowerMemOpCallTo(SDValue Chain, + SDValue StackPtr, SDValue Arg, + DebugLoc dl, SelectionDAG &DAG, + const CCValAssign &VA, + ISD::ArgFlagsTy Flags) const { + unsigned LocMemOffset = VA.getLocMemOffset(); + SDValue PtrOff = DAG.getIntPtrConstant(LocMemOffset); + PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(), StackPtr, PtrOff); + if (Flags.isByVal()) { + return CreateCopyOfByValArgument(Arg, PtrOff, Chain, Flags, DAG, dl); + } + return DAG.getStore(Chain, dl, Arg, PtrOff, + PseudoSourceValue::getStack(), LocMemOffset, + false, false, 0); +} + +void ARMTargetLowering::PassF64ArgInRegs(DebugLoc dl, SelectionDAG &DAG, + SDValue Chain, SDValue &Arg, + RegsToPassVector &RegsToPass, + CCValAssign &VA, CCValAssign &NextVA, + SDValue &StackPtr, + SmallVector<SDValue, 8> &MemOpChains, + ISD::ArgFlagsTy Flags) const { + + SDValue fmrrd = DAG.getNode(ARMISD::VMOVRRD, dl, + DAG.getVTList(MVT::i32, MVT::i32), Arg); + RegsToPass.push_back(std::make_pair(VA.getLocReg(), fmrrd)); + + if (NextVA.isRegLoc()) + RegsToPass.push_back(std::make_pair(NextVA.getLocReg(), fmrrd.getValue(1))); + else { + assert(NextVA.isMemLoc()); + if (StackPtr.getNode() == 0) + StackPtr = DAG.getCopyFromReg(Chain, dl, ARM::SP, getPointerTy()); + + MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, fmrrd.getValue(1), + dl, DAG, NextVA, + Flags)); + } +} + +/// LowerCall - Lowering a call into a callseq_start <- +/// ARMISD:CALL <- callseq_end chain. Also add input and output parameter +/// nodes. +SDValue +ARMTargetLowering::LowerCall(SDValue Chain, SDValue Callee, + CallingConv::ID CallConv, bool isVarArg, + bool &isTailCall, + const SmallVectorImpl<ISD::OutputArg> &Outs, + const SmallVectorImpl<ISD::InputArg> &Ins, + DebugLoc dl, SelectionDAG &DAG, + SmallVectorImpl<SDValue> &InVals) const { + // ARM target does not yet support tail call optimization. + isTailCall = false; + + // Analyze operands of the call, assigning locations to each operand. + SmallVector<CCValAssign, 16> ArgLocs; + CCState CCInfo(CallConv, isVarArg, getTargetMachine(), ArgLocs, + *DAG.getContext()); + CCInfo.AnalyzeCallOperands(Outs, + CCAssignFnForNode(CallConv, /* Return*/ false, + isVarArg)); + + // Get a count of how many bytes are to be pushed on the stack. + unsigned NumBytes = CCInfo.getNextStackOffset(); + + // Adjust the stack pointer for the new arguments... + // These operations are automatically eliminated by the prolog/epilog pass + Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true)); + + SDValue StackPtr = DAG.getCopyFromReg(Chain, dl, ARM::SP, getPointerTy()); + + RegsToPassVector RegsToPass; + SmallVector<SDValue, 8> MemOpChains; + + // Walk the register/memloc assignments, inserting copies/loads. In the case + // of tail call optimization, arguments are handled later. + for (unsigned i = 0, realArgIdx = 0, e = ArgLocs.size(); + i != e; + ++i, ++realArgIdx) { + CCValAssign &VA = ArgLocs[i]; + SDValue Arg = Outs[realArgIdx].Val; + ISD::ArgFlagsTy Flags = Outs[realArgIdx].Flags; + + // Promote the value if needed. + switch (VA.getLocInfo()) { + default: llvm_unreachable("Unknown loc info!"); + case CCValAssign::Full: break; + case CCValAssign::SExt: + Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg); + break; + case CCValAssign::ZExt: + Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg); + break; + case CCValAssign::AExt: + Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg); + break; + case CCValAssign::BCvt: + Arg = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getLocVT(), Arg); + break; + } + + // f64 and v2f64 might be passed in i32 pairs and must be split into pieces + if (VA.needsCustom()) { + if (VA.getLocVT() == MVT::v2f64) { + SDValue Op0 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg, + DAG.getConstant(0, MVT::i32)); + SDValue Op1 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg, + DAG.getConstant(1, MVT::i32)); + + PassF64ArgInRegs(dl, DAG, Chain, Op0, RegsToPass, + VA, ArgLocs[++i], StackPtr, MemOpChains, Flags); + + VA = ArgLocs[++i]; // skip ahead to next loc + if (VA.isRegLoc()) { + PassF64ArgInRegs(dl, DAG, Chain, Op1, RegsToPass, + VA, ArgLocs[++i], StackPtr, MemOpChains, Flags); + } else { + assert(VA.isMemLoc()); + + MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, Op1, + dl, DAG, VA, Flags)); + } + } else { + PassF64ArgInRegs(dl, DAG, Chain, Arg, RegsToPass, VA, ArgLocs[++i], + StackPtr, MemOpChains, Flags); + } + } else if (VA.isRegLoc()) { + RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg)); + } else { + assert(VA.isMemLoc()); + + MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, Arg, + dl, DAG, VA, Flags)); + } + } + + if (!MemOpChains.empty()) + Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, + &MemOpChains[0], MemOpChains.size()); + + // Build a sequence of copy-to-reg nodes chained together with token chain + // and flag operands which copy the outgoing args into the appropriate regs. + SDValue InFlag; + for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) { + Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first, + RegsToPass[i].second, InFlag); + InFlag = Chain.getValue(1); + } + + // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every + // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol + // node so that legalize doesn't hack it. + bool isDirect = false; + bool isARMFunc = false; + bool isLocalARMFunc = false; + MachineFunction &MF = DAG.getMachineFunction(); + ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>(); + + if (EnableARMLongCalls) { + assert (getTargetMachine().getRelocationModel() == Reloc::Static + && "long-calls with non-static relocation model!"); + // Handle a global address or an external symbol. If it's not one of + // those, the target's already in a register, so we don't need to do + // anything extra. + if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) { + const GlobalValue *GV = G->getGlobal(); + // Create a constant pool entry for the callee address + unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId(); + ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, + ARMPCLabelIndex, + ARMCP::CPValue, 0); + // Get the address of the callee into a register + SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4); + CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr); + Callee = DAG.getLoad(getPointerTy(), dl, + DAG.getEntryNode(), CPAddr, + PseudoSourceValue::getConstantPool(), 0, + false, false, 0); + } else if (ExternalSymbolSDNode *S=dyn_cast<ExternalSymbolSDNode>(Callee)) { + const char *Sym = S->getSymbol(); + + // Create a constant pool entry for the callee address + unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId(); + ARMConstantPoolValue *CPV = new ARMConstantPoolValue(*DAG.getContext(), + Sym, ARMPCLabelIndex, 0); + // Get the address of the callee into a register + SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4); + CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr); + Callee = DAG.getLoad(getPointerTy(), dl, + DAG.getEntryNode(), CPAddr, + PseudoSourceValue::getConstantPool(), 0, + false, false, 0); + } + } else if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) { + const GlobalValue *GV = G->getGlobal(); + isDirect = true; + bool isExt = GV->isDeclaration() || GV->isWeakForLinker(); + bool isStub = (isExt && Subtarget->isTargetDarwin()) && + getTargetMachine().getRelocationModel() != Reloc::Static; + isARMFunc = !Subtarget->isThumb() || isStub; + // ARM call to a local ARM function is predicable. + isLocalARMFunc = !Subtarget->isThumb() && !isExt; + // tBX takes a register source operand. + if (isARMFunc && Subtarget->isThumb1Only() && !Subtarget->hasV5TOps()) { + unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId(); + ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, + ARMPCLabelIndex, + ARMCP::CPValue, 4); + SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4); + CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr); + Callee = DAG.getLoad(getPointerTy(), dl, + DAG.getEntryNode(), CPAddr, + PseudoSourceValue::getConstantPool(), 0, + false, false, 0); + SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32); + Callee = DAG.getNode(ARMISD::PIC_ADD, dl, + getPointerTy(), Callee, PICLabel); + } else + Callee = DAG.getTargetGlobalAddress(GV, getPointerTy()); + } else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) { + isDirect = true; + bool isStub = Subtarget->isTargetDarwin() && + getTargetMachine().getRelocationModel() != Reloc::Static; + isARMFunc = !Subtarget->isThumb() || isStub; + // tBX takes a register source operand. + const char *Sym = S->getSymbol(); + if (isARMFunc && Subtarget->isThumb1Only() && !Subtarget->hasV5TOps()) { + unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId(); + ARMConstantPoolValue *CPV = new ARMConstantPoolValue(*DAG.getContext(), + Sym, ARMPCLabelIndex, 4); + SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4); + CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr); + Callee = DAG.getLoad(getPointerTy(), dl, + DAG.getEntryNode(), CPAddr, + PseudoSourceValue::getConstantPool(), 0, + false, false, 0); + SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32); + Callee = DAG.getNode(ARMISD::PIC_ADD, dl, + getPointerTy(), Callee, PICLabel); + } else + Callee = DAG.getTargetExternalSymbol(Sym, getPointerTy()); + } + + // FIXME: handle tail calls differently. + unsigned CallOpc; + if (Subtarget->isThumb()) { + if ((!isDirect || isARMFunc) && !Subtarget->hasV5TOps()) + CallOpc = ARMISD::CALL_NOLINK; + else + CallOpc = isARMFunc ? ARMISD::CALL : ARMISD::tCALL; + } else { + CallOpc = (isDirect || Subtarget->hasV5TOps()) + ? (isLocalARMFunc ? ARMISD::CALL_PRED : ARMISD::CALL) + : ARMISD::CALL_NOLINK; + } + if (CallOpc == ARMISD::CALL_NOLINK && !Subtarget->isThumb1Only()) { + // implicit def LR - LR mustn't be allocated as GRP:$dst of CALL_NOLINK + Chain = DAG.getCopyToReg(Chain, dl, ARM::LR, DAG.getUNDEF(MVT::i32),InFlag); + InFlag = Chain.getValue(1); + } + + std::vector<SDValue> Ops; + Ops.push_back(Chain); + Ops.push_back(Callee); + + // Add argument registers to the end of the list so that they are known live + // into the call. + for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) + Ops.push_back(DAG.getRegister(RegsToPass[i].first, + RegsToPass[i].second.getValueType())); + + if (InFlag.getNode()) + Ops.push_back(InFlag); + // Returns a chain and a flag for retval copy to use. + Chain = DAG.getNode(CallOpc, dl, DAG.getVTList(MVT::Other, MVT::Flag), + &Ops[0], Ops.size()); + InFlag = Chain.getValue(1); + + Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true), + DAG.getIntPtrConstant(0, true), InFlag); + if (!Ins.empty()) + InFlag = Chain.getValue(1); + + // Handle result values, copying them out of physregs into vregs that we + // return. + return LowerCallResult(Chain, InFlag, CallConv, isVarArg, Ins, + dl, DAG, InVals); +} + +SDValue +ARMTargetLowering::LowerReturn(SDValue Chain, + CallingConv::ID CallConv, bool isVarArg, + const SmallVectorImpl<ISD::OutputArg> &Outs, + DebugLoc dl, SelectionDAG &DAG) const { + + // CCValAssign - represent the assignment of the return value to a location. + SmallVector<CCValAssign, 16> RVLocs; + + // CCState - Info about the registers and stack slots. + CCState CCInfo(CallConv, isVarArg, getTargetMachine(), RVLocs, + *DAG.getContext()); + + // Analyze outgoing return values. + CCInfo.AnalyzeReturn(Outs, CCAssignFnForNode(CallConv, /* Return */ true, + isVarArg)); + + // If this is the first return lowered for this function, add + // the regs to the liveout set for the function. + if (DAG.getMachineFunction().getRegInfo().liveout_empty()) { + for (unsigned i = 0; i != RVLocs.size(); ++i) + if (RVLocs[i].isRegLoc()) + DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg()); + } + + SDValue Flag; + + // Copy the result values into the output registers. + for (unsigned i = 0, realRVLocIdx = 0; + i != RVLocs.size(); + ++i, ++realRVLocIdx) { + CCValAssign &VA = RVLocs[i]; + assert(VA.isRegLoc() && "Can only return in registers!"); + + SDValue Arg = Outs[realRVLocIdx].Val; + + switch (VA.getLocInfo()) { + default: llvm_unreachable("Unknown loc info!"); + case CCValAssign::Full: break; + case CCValAssign::BCvt: + Arg = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getLocVT(), Arg); + break; + } + + if (VA.needsCustom()) { + if (VA.getLocVT() == MVT::v2f64) { + // Extract the first half and return it in two registers. + SDValue Half = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg, + DAG.getConstant(0, MVT::i32)); + SDValue HalfGPRs = DAG.getNode(ARMISD::VMOVRRD, dl, + DAG.getVTList(MVT::i32, MVT::i32), Half); + + Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), HalfGPRs, Flag); + Flag = Chain.getValue(1); + VA = RVLocs[++i]; // skip ahead to next loc + Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), + HalfGPRs.getValue(1), Flag); + Flag = Chain.getValue(1); + VA = RVLocs[++i]; // skip ahead to next loc + + // Extract the 2nd half and fall through to handle it as an f64 value. + Arg = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg, + DAG.getConstant(1, MVT::i32)); + } + // Legalize ret f64 -> ret 2 x i32. We always have fmrrd if f64 is + // available. + SDValue fmrrd = DAG.getNode(ARMISD::VMOVRRD, dl, + DAG.getVTList(MVT::i32, MVT::i32), &Arg, 1); + Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), fmrrd, Flag); + Flag = Chain.getValue(1); + VA = RVLocs[++i]; // skip ahead to next loc + Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), fmrrd.getValue(1), + Flag); + } else + Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), Arg, Flag); + + // Guarantee that all emitted copies are + // stuck together, avoiding something bad. + Flag = Chain.getValue(1); + } + + SDValue result; + if (Flag.getNode()) + result = DAG.getNode(ARMISD::RET_FLAG, dl, MVT::Other, Chain, Flag); + else // Return Void + result = DAG.getNode(ARMISD::RET_FLAG, dl, MVT::Other, Chain); + + return result; +} + +// ConstantPool, JumpTable, GlobalAddress, and ExternalSymbol are lowered as +// their target counterpart wrapped in the ARMISD::Wrapper node. Suppose N is +// one of the above mentioned nodes. It has to be wrapped because otherwise +// Select(N) returns N. So the raw TargetGlobalAddress nodes, etc. can only +// be used to form addressing mode. These wrapped nodes will be selected +// into MOVi. +static SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) { + EVT PtrVT = Op.getValueType(); + // FIXME there is no actual debug info here + DebugLoc dl = Op.getDebugLoc(); + ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op); + SDValue Res; + if (CP->isMachineConstantPoolEntry()) + Res = DAG.getTargetConstantPool(CP->getMachineCPVal(), PtrVT, + CP->getAlignment()); + else + Res = DAG.getTargetConstantPool(CP->getConstVal(), PtrVT, + CP->getAlignment()); + return DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Res); +} + +SDValue ARMTargetLowering::LowerBlockAddress(SDValue Op, + SelectionDAG &DAG) const { + MachineFunction &MF = DAG.getMachineFunction(); + ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>(); + unsigned ARMPCLabelIndex = 0; + DebugLoc DL = Op.getDebugLoc(); + EVT PtrVT = getPointerTy(); + const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress(); + Reloc::Model RelocM = getTargetMachine().getRelocationModel(); + SDValue CPAddr; + if (RelocM == Reloc::Static) { + CPAddr = DAG.getTargetConstantPool(BA, PtrVT, 4); + } else { + unsigned PCAdj = Subtarget->isThumb() ? 4 : 8; + ARMPCLabelIndex = AFI->createConstPoolEntryUId(); + ARMConstantPoolValue *CPV = new ARMConstantPoolValue(BA, ARMPCLabelIndex, + ARMCP::CPBlockAddress, + PCAdj); + CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4); + } + CPAddr = DAG.getNode(ARMISD::Wrapper, DL, PtrVT, CPAddr); + SDValue Result = DAG.getLoad(PtrVT, DL, DAG.getEntryNode(), CPAddr, + PseudoSourceValue::getConstantPool(), 0, + false, false, 0); + if (RelocM == Reloc::Static) + return Result; + SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32); + return DAG.getNode(ARMISD::PIC_ADD, DL, PtrVT, Result, PICLabel); +} + +// Lower ISD::GlobalTLSAddress using the "general dynamic" model +SDValue +ARMTargetLowering::LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA, + SelectionDAG &DAG) const { + DebugLoc dl = GA->getDebugLoc(); + EVT PtrVT = getPointerTy(); + unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8; + MachineFunction &MF = DAG.getMachineFunction(); + ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>(); + unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId(); + ARMConstantPoolValue *CPV = + new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex, + ARMCP::CPValue, PCAdj, "tlsgd", true); + SDValue Argument = DAG.getTargetConstantPool(CPV, PtrVT, 4); + Argument = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Argument); + Argument = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), Argument, + PseudoSourceValue::getConstantPool(), 0, + false, false, 0); + SDValue Chain = Argument.getValue(1); + + SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32); + Argument = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Argument, PICLabel); + + // call __tls_get_addr. + ArgListTy Args; + ArgListEntry Entry; + Entry.Node = Argument; + Entry.Ty = (const Type *) Type::getInt32Ty(*DAG.getContext()); + Args.push_back(Entry); + // FIXME: is there useful debug info available here? + std::pair<SDValue, SDValue> CallResult = + LowerCallTo(Chain, (const Type *) Type::getInt32Ty(*DAG.getContext()), + false, false, false, false, + 0, CallingConv::C, false, /*isReturnValueUsed=*/true, + DAG.getExternalSymbol("__tls_get_addr", PtrVT), Args, DAG, dl); + return CallResult.first; +} + +// Lower ISD::GlobalTLSAddress using the "initial exec" or +// "local exec" model. +SDValue +ARMTargetLowering::LowerToTLSExecModels(GlobalAddressSDNode *GA, + SelectionDAG &DAG) const { + const GlobalValue *GV = GA->getGlobal(); + DebugLoc dl = GA->getDebugLoc(); + SDValue Offset; + SDValue Chain = DAG.getEntryNode(); + EVT PtrVT = getPointerTy(); + // Get the Thread Pointer + SDValue ThreadPointer = DAG.getNode(ARMISD::THREAD_POINTER, dl, PtrVT); + + if (GV->isDeclaration()) { + MachineFunction &MF = DAG.getMachineFunction(); + ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>(); + unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId(); + // Initial exec model. + unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8; + ARMConstantPoolValue *CPV = + new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex, + ARMCP::CPValue, PCAdj, "gottpoff", true); + Offset = DAG.getTargetConstantPool(CPV, PtrVT, 4); + Offset = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Offset); + Offset = DAG.getLoad(PtrVT, dl, Chain, Offset, + PseudoSourceValue::getConstantPool(), 0, + false, false, 0); + Chain = Offset.getValue(1); + + SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32); + Offset = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Offset, PICLabel); + + Offset = DAG.getLoad(PtrVT, dl, Chain, Offset, + PseudoSourceValue::getConstantPool(), 0, + false, false, 0); + } else { + // local exec model + ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, "tpoff"); + Offset = DAG.getTargetConstantPool(CPV, PtrVT, 4); + Offset = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Offset); + Offset = DAG.getLoad(PtrVT, dl, Chain, Offset, + PseudoSourceValue::getConstantPool(), 0, + false, false, 0); + } + + // The address of the thread local variable is the add of the thread + // pointer with the offset of the variable. + return DAG.getNode(ISD::ADD, dl, PtrVT, ThreadPointer, Offset); +} + +SDValue +ARMTargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const { + // TODO: implement the "local dynamic" model + assert(Subtarget->isTargetELF() && + "TLS not implemented for non-ELF targets"); + GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op); + // If the relocation model is PIC, use the "General Dynamic" TLS Model, + // otherwise use the "Local Exec" TLS Model + if (getTargetMachine().getRelocationModel() == Reloc::PIC_) + return LowerToTLSGeneralDynamicModel(GA, DAG); + else + return LowerToTLSExecModels(GA, DAG); +} + +SDValue ARMTargetLowering::LowerGlobalAddressELF(SDValue Op, + SelectionDAG &DAG) const { + EVT PtrVT = getPointerTy(); + DebugLoc dl = Op.getDebugLoc(); + const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal(); + Reloc::Model RelocM = getTargetMachine().getRelocationModel(); + if (RelocM == Reloc::PIC_) { + bool UseGOTOFF = GV->hasLocalLinkage() || GV->hasHiddenVisibility(); + ARMConstantPoolValue *CPV = + new ARMConstantPoolValue(GV, UseGOTOFF ? "GOTOFF" : "GOT"); + SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4); + CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr); + SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), + CPAddr, + PseudoSourceValue::getConstantPool(), 0, + false, false, 0); + SDValue Chain = Result.getValue(1); + SDValue GOT = DAG.getGLOBAL_OFFSET_TABLE(PtrVT); + Result = DAG.getNode(ISD::ADD, dl, PtrVT, Result, GOT); + if (!UseGOTOFF) + Result = DAG.getLoad(PtrVT, dl, Chain, Result, + PseudoSourceValue::getGOT(), 0, + false, false, 0); + return Result; + } else { + // If we have T2 ops, we can materialize the address directly via movt/movw + // pair. This is always cheaper. + if (Subtarget->useMovt()) { + return DAG.getNode(ARMISD::Wrapper, dl, PtrVT, + DAG.getTargetGlobalAddress(GV, PtrVT)); + } else { + SDValue CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 4); + CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr); + return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr, + PseudoSourceValue::getConstantPool(), 0, + false, false, 0); + } + } +} + +SDValue ARMTargetLowering::LowerGlobalAddressDarwin(SDValue Op, + SelectionDAG &DAG) const { + MachineFunction &MF = DAG.getMachineFunction(); + ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>(); + unsigned ARMPCLabelIndex = 0; + EVT PtrVT = getPointerTy(); + DebugLoc dl = Op.getDebugLoc(); + const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal(); + Reloc::Model RelocM = getTargetMachine().getRelocationModel(); + SDValue CPAddr; + if (RelocM == Reloc::Static) + CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 4); + else { + ARMPCLabelIndex = AFI->createConstPoolEntryUId(); + unsigned PCAdj = (RelocM != Reloc::PIC_) ? 0 : (Subtarget->isThumb()?4:8); + ARMConstantPoolValue *CPV = + new ARMConstantPoolValue(GV, ARMPCLabelIndex, ARMCP::CPValue, PCAdj); + CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4); + } + CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr); + + SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr, + PseudoSourceValue::getConstantPool(), 0, + false, false, 0); + SDValue Chain = Result.getValue(1); + + if (RelocM == Reloc::PIC_) { + SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32); + Result = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel); + } + + if (Subtarget->GVIsIndirectSymbol(GV, RelocM)) + Result = DAG.getLoad(PtrVT, dl, Chain, Result, + PseudoSourceValue::getGOT(), 0, + false, false, 0); + + return Result; +} + +SDValue ARMTargetLowering::LowerGLOBAL_OFFSET_TABLE(SDValue Op, + SelectionDAG &DAG) const { + assert(Subtarget->isTargetELF() && + "GLOBAL OFFSET TABLE not implemented for non-ELF targets"); + MachineFunction &MF = DAG.getMachineFunction(); + ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>(); + unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId(); + EVT PtrVT = getPointerTy(); + DebugLoc dl = Op.getDebugLoc(); + unsigned PCAdj = Subtarget->isThumb() ? 4 : 8; + ARMConstantPoolValue *CPV = new ARMConstantPoolValue(*DAG.getContext(), + "_GLOBAL_OFFSET_TABLE_", + ARMPCLabelIndex, PCAdj); + SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4); + CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr); + SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr, + PseudoSourceValue::getConstantPool(), 0, + false, false, 0); + SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32); + return DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel); +} + +SDValue +ARMTargetLowering::LowerEH_SJLJ_SETJMP(SDValue Op, SelectionDAG &DAG) const { + DebugLoc dl = Op.getDebugLoc(); + SDValue Val = Subtarget->isThumb() ? + DAG.getCopyFromReg(DAG.getEntryNode(), dl, ARM::SP, MVT::i32) : + DAG.getConstant(0, MVT::i32); + return DAG.getNode(ARMISD::EH_SJLJ_SETJMP, dl, MVT::i32, Op.getOperand(0), + Op.getOperand(1), Val); +} + +SDValue +ARMTargetLowering::LowerEH_SJLJ_LONGJMP(SDValue Op, SelectionDAG &DAG) const { + DebugLoc dl = Op.getDebugLoc(); + return DAG.getNode(ARMISD::EH_SJLJ_LONGJMP, dl, MVT::Other, Op.getOperand(0), + Op.getOperand(1), DAG.getConstant(0, MVT::i32)); +} + +SDValue +ARMTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG, + const ARMSubtarget *Subtarget) + const { + unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue(); + DebugLoc dl = Op.getDebugLoc(); + switch (IntNo) { + default: return SDValue(); // Don't custom lower most intrinsics. + case Intrinsic::arm_thread_pointer: { + EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy(); + return DAG.getNode(ARMISD::THREAD_POINTER, dl, PtrVT); + } + case Intrinsic::eh_sjlj_lsda: { + MachineFunction &MF = DAG.getMachineFunction(); + ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>(); + unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId(); + EVT PtrVT = getPointerTy(); + DebugLoc dl = Op.getDebugLoc(); + Reloc::Model RelocM = getTargetMachine().getRelocationModel(); + SDValue CPAddr; + unsigned PCAdj = (RelocM != Reloc::PIC_) + ? 0 : (Subtarget->isThumb() ? 4 : 8); + ARMConstantPoolValue *CPV = + new ARMConstantPoolValue(MF.getFunction(), ARMPCLabelIndex, + ARMCP::CPLSDA, PCAdj); + CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4); + CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr); + SDValue Result = + DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr, + PseudoSourceValue::getConstantPool(), 0, + false, false, 0); + SDValue Chain = Result.getValue(1); + + if (RelocM == Reloc::PIC_) { + SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32); + Result = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel); + } + return Result; + } + } +} + +static SDValue LowerMEMBARRIER(SDValue Op, SelectionDAG &DAG, + const ARMSubtarget *Subtarget) { + DebugLoc dl = Op.getDebugLoc(); + SDValue Op5 = Op.getOperand(5); + SDValue Res; + unsigned isDeviceBarrier = cast<ConstantSDNode>(Op5)->getZExtValue(); + if (isDeviceBarrier) { + if (Subtarget->hasV7Ops()) + Res = DAG.getNode(ARMISD::SYNCBARRIER, dl, MVT::Other, Op.getOperand(0)); + else + Res = DAG.getNode(ARMISD::SYNCBARRIER, dl, MVT::Other, Op.getOperand(0), + DAG.getConstant(0, MVT::i32)); + } else { + if (Subtarget->hasV7Ops()) + Res = DAG.getNode(ARMISD::MEMBARRIER, dl, MVT::Other, Op.getOperand(0)); + else + Res = DAG.getNode(ARMISD::MEMBARRIER, dl, MVT::Other, Op.getOperand(0), + DAG.getConstant(0, MVT::i32)); + } + return Res; +} + +static SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) { + MachineFunction &MF = DAG.getMachineFunction(); + ARMFunctionInfo *FuncInfo = MF.getInfo<ARMFunctionInfo>(); + + // vastart just stores the address of the VarArgsFrameIndex slot into the + // memory location argument. + DebugLoc dl = Op.getDebugLoc(); + EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy(); + SDValue FR = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT); + const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue(); + return DAG.getStore(Op.getOperand(0), dl, FR, Op.getOperand(1), SV, 0, + false, false, 0); +} + +SDValue +ARMTargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op, + SelectionDAG &DAG) const { + SDNode *Node = Op.getNode(); + DebugLoc dl = Node->getDebugLoc(); + EVT VT = Node->getValueType(0); + SDValue Chain = Op.getOperand(0); + SDValue Size = Op.getOperand(1); + SDValue Align = Op.getOperand(2); + + // Chain the dynamic stack allocation so that it doesn't modify the stack + // pointer when other instructions are using the stack. + Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(0, true)); + + unsigned AlignVal = cast<ConstantSDNode>(Align)->getZExtValue(); + unsigned StackAlign = getTargetMachine().getFrameInfo()->getStackAlignment(); + if (AlignVal > StackAlign) + // Do this now since selection pass cannot introduce new target + // independent node. + Align = DAG.getConstant(-(uint64_t)AlignVal, VT); + + // In Thumb1 mode, there isn't a "sub r, sp, r" instruction, we will end up + // using a "add r, sp, r" instead. Negate the size now so we don't have to + // do even more horrible hack later. + MachineFunction &MF = DAG.getMachineFunction(); + ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>(); + if (AFI->isThumb1OnlyFunction()) { + bool Negate = true; + ConstantSDNode *C = dyn_cast<ConstantSDNode>(Size); + if (C) { + uint32_t Val = C->getZExtValue(); + if (Val <= 508 && ((Val & 3) == 0)) + Negate = false; + } + if (Negate) + Size = DAG.getNode(ISD::SUB, dl, VT, DAG.getConstant(0, VT), Size); + } + + SDVTList VTList = DAG.getVTList(VT, MVT::Other); + SDValue Ops1[] = { Chain, Size, Align }; + SDValue Res = DAG.getNode(ARMISD::DYN_ALLOC, dl, VTList, Ops1, 3); + Chain = Res.getValue(1); + Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(0, true), + DAG.getIntPtrConstant(0, true), SDValue()); + SDValue Ops2[] = { Res, Chain }; + return DAG.getMergeValues(Ops2, 2, dl); +} + +SDValue +ARMTargetLowering::GetF64FormalArgument(CCValAssign &VA, CCValAssign &NextVA, + SDValue &Root, SelectionDAG &DAG, + DebugLoc dl) const { + MachineFunction &MF = DAG.getMachineFunction(); + ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>(); + + TargetRegisterClass *RC; + if (AFI->isThumb1OnlyFunction()) + RC = ARM::tGPRRegisterClass; + else + RC = ARM::GPRRegisterClass; + + // Transform the arguments stored in physical registers into virtual ones. + unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC); + SDValue ArgValue = DAG.getCopyFromReg(Root, dl, Reg, MVT::i32); + + SDValue ArgValue2; + if (NextVA.isMemLoc()) { + MachineFrameInfo *MFI = MF.getFrameInfo(); + int FI = MFI->CreateFixedObject(4, NextVA.getLocMemOffset(), true, false); + + // Create load node to retrieve arguments from the stack. + SDValue FIN = DAG.getFrameIndex(FI, getPointerTy()); + ArgValue2 = DAG.getLoad(MVT::i32, dl, Root, FIN, + PseudoSourceValue::getFixedStack(FI), 0, + false, false, 0); + } else { + Reg = MF.addLiveIn(NextVA.getLocReg(), RC); + ArgValue2 = DAG.getCopyFromReg(Root, dl, Reg, MVT::i32); + } + + return DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, ArgValue, ArgValue2); +} + +SDValue +ARMTargetLowering::LowerFormalArguments(SDValue Chain, + CallingConv::ID CallConv, bool isVarArg, + const SmallVectorImpl<ISD::InputArg> + &Ins, + DebugLoc dl, SelectionDAG &DAG, + SmallVectorImpl<SDValue> &InVals) + const { + + MachineFunction &MF = DAG.getMachineFunction(); + MachineFrameInfo *MFI = MF.getFrameInfo(); + + ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>(); + + // Assign locations to all of the incoming arguments. + SmallVector<CCValAssign, 16> ArgLocs; + CCState CCInfo(CallConv, isVarArg, getTargetMachine(), ArgLocs, + *DAG.getContext()); + CCInfo.AnalyzeFormalArguments(Ins, + CCAssignFnForNode(CallConv, /* Return*/ false, + isVarArg)); + + SmallVector<SDValue, 16> ArgValues; + + for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { + CCValAssign &VA = ArgLocs[i]; + + // Arguments stored in registers. + if (VA.isRegLoc()) { + EVT RegVT = VA.getLocVT(); + + SDValue ArgValue; + if (VA.needsCustom()) { + // f64 and vector types are split up into multiple registers or + // combinations of registers and stack slots. + if (VA.getLocVT() == MVT::v2f64) { + SDValue ArgValue1 = GetF64FormalArgument(VA, ArgLocs[++i], + Chain, DAG, dl); + VA = ArgLocs[++i]; // skip ahead to next loc + SDValue ArgValue2; + if (VA.isMemLoc()) { + int FI = MFI->CreateFixedObject(8, VA.getLocMemOffset(), + true, false); + SDValue FIN = DAG.getFrameIndex(FI, getPointerTy()); + ArgValue2 = DAG.getLoad(MVT::f64, dl, Chain, FIN, + PseudoSourceValue::getFixedStack(FI), 0, + false, false, 0); + } else { + ArgValue2 = GetF64FormalArgument(VA, ArgLocs[++i], + Chain, DAG, dl); + } + ArgValue = DAG.getNode(ISD::UNDEF, dl, MVT::v2f64); + ArgValue = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, + ArgValue, ArgValue1, DAG.getIntPtrConstant(0)); + ArgValue = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, + ArgValue, ArgValue2, DAG.getIntPtrConstant(1)); + } else + ArgValue = GetF64FormalArgument(VA, ArgLocs[++i], Chain, DAG, dl); + + } else { + TargetRegisterClass *RC; + + if (RegVT == MVT::f32) + RC = ARM::SPRRegisterClass; + else if (RegVT == MVT::f64) + RC = ARM::DPRRegisterClass; + else if (RegVT == MVT::v2f64) + RC = ARM::QPRRegisterClass; + else if (RegVT == MVT::i32) + RC = (AFI->isThumb1OnlyFunction() ? + ARM::tGPRRegisterClass : ARM::GPRRegisterClass); + else + llvm_unreachable("RegVT not supported by FORMAL_ARGUMENTS Lowering"); + + // Transform the arguments in physical registers into virtual ones. + unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC); + ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, RegVT); + } + + // If this is an 8 or 16-bit value, it is really passed promoted + // to 32 bits. Insert an assert[sz]ext to capture this, then + // truncate to the right size. + switch (VA.getLocInfo()) { + default: llvm_unreachable("Unknown loc info!"); + case CCValAssign::Full: break; + case CCValAssign::BCvt: + ArgValue = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getValVT(), ArgValue); + break; + case CCValAssign::SExt: + ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue, + DAG.getValueType(VA.getValVT())); + ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue); + break; + case CCValAssign::ZExt: + ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue, + DAG.getValueType(VA.getValVT())); + ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue); + break; + } + + InVals.push_back(ArgValue); + + } else { // VA.isRegLoc() + + // sanity check + assert(VA.isMemLoc()); + assert(VA.getValVT() != MVT::i64 && "i64 should already be lowered"); + + unsigned ArgSize = VA.getLocVT().getSizeInBits()/8; + int FI = MFI->CreateFixedObject(ArgSize, VA.getLocMemOffset(), + true, false); + + // Create load nodes to retrieve arguments from the stack. + SDValue FIN = DAG.getFrameIndex(FI, getPointerTy()); + InVals.push_back(DAG.getLoad(VA.getValVT(), dl, Chain, FIN, + PseudoSourceValue::getFixedStack(FI), 0, + false, false, 0)); + } + } + + // varargs + if (isVarArg) { + static const unsigned GPRArgRegs[] = { + ARM::R0, ARM::R1, ARM::R2, ARM::R3 + }; + + unsigned NumGPRs = CCInfo.getFirstUnallocated + (GPRArgRegs, sizeof(GPRArgRegs) / sizeof(GPRArgRegs[0])); + + unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment(); + unsigned VARegSize = (4 - NumGPRs) * 4; + unsigned VARegSaveSize = (VARegSize + Align - 1) & ~(Align - 1); + unsigned ArgOffset = CCInfo.getNextStackOffset(); + if (VARegSaveSize) { + // If this function is vararg, store any remaining integer argument regs + // to their spots on the stack so that they may be loaded by deferencing + // the result of va_next. + AFI->setVarArgsRegSaveSize(VARegSaveSize); + AFI->setVarArgsFrameIndex( + MFI->CreateFixedObject(VARegSaveSize, + ArgOffset + VARegSaveSize - VARegSize, + true, false)); + SDValue FIN = DAG.getFrameIndex(AFI->getVarArgsFrameIndex(), + getPointerTy()); + + SmallVector<SDValue, 4> MemOps; + for (; NumGPRs < 4; ++NumGPRs) { + TargetRegisterClass *RC; + if (AFI->isThumb1OnlyFunction()) + RC = ARM::tGPRRegisterClass; + else + RC = ARM::GPRRegisterClass; + + unsigned VReg = MF.addLiveIn(GPRArgRegs[NumGPRs], RC); + SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i32); + SDValue Store = + DAG.getStore(Val.getValue(1), dl, Val, FIN, + PseudoSourceValue::getFixedStack(AFI->getVarArgsFrameIndex()), 0, + false, false, 0); + MemOps.push_back(Store); + FIN = DAG.getNode(ISD::ADD, dl, getPointerTy(), FIN, + DAG.getConstant(4, getPointerTy())); + } + if (!MemOps.empty()) + Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, + &MemOps[0], MemOps.size()); + } else + // This will point to the next argument passed via stack. + AFI->setVarArgsFrameIndex(MFI->CreateFixedObject(4, ArgOffset, + true, false)); + } + + return Chain; +} + +/// isFloatingPointZero - Return true if this is +0.0. +static bool isFloatingPointZero(SDValue Op) { + if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op)) + return CFP->getValueAPF().isPosZero(); + else if (ISD::isEXTLoad(Op.getNode()) || ISD::isNON_EXTLoad(Op.getNode())) { + // Maybe this has already been legalized into the constant pool? + if (Op.getOperand(1).getOpcode() == ARMISD::Wrapper) { + SDValue WrapperOp = Op.getOperand(1).getOperand(0); + if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(WrapperOp)) + if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal())) + return CFP->getValueAPF().isPosZero(); + } + } + return false; +} + +/// Returns appropriate ARM CMP (cmp) and corresponding condition code for +/// the given operands. +SDValue +ARMTargetLowering::getARMCmp(SDValue LHS, SDValue RHS, ISD::CondCode CC, + SDValue &ARMCC, SelectionDAG &DAG, + DebugLoc dl) const { + if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS.getNode())) { + unsigned C = RHSC->getZExtValue(); + if (!isLegalICmpImmediate(C)) { + // Constant does not fit, try adjusting it by one? + switch (CC) { + default: break; + case ISD::SETLT: + case ISD::SETGE: + if (isLegalICmpImmediate(C-1)) { + CC = (CC == ISD::SETLT) ? ISD::SETLE : ISD::SETGT; + RHS = DAG.getConstant(C-1, MVT::i32); + } + break; + case ISD::SETULT: + case ISD::SETUGE: + if (C > 0 && isLegalICmpImmediate(C-1)) { + CC = (CC == ISD::SETULT) ? ISD::SETULE : ISD::SETUGT; + RHS = DAG.getConstant(C-1, MVT::i32); + } + break; + case ISD::SETLE: + case ISD::SETGT: + if (isLegalICmpImmediate(C+1)) { + CC = (CC == ISD::SETLE) ? ISD::SETLT : ISD::SETGE; + RHS = DAG.getConstant(C+1, MVT::i32); + } + break; + case ISD::SETULE: + case ISD::SETUGT: + if (C < 0xffffffff && isLegalICmpImmediate(C+1)) { + CC = (CC == ISD::SETULE) ? ISD::SETULT : ISD::SETUGE; + RHS = DAG.getConstant(C+1, MVT::i32); + } + break; + } + } + } + + ARMCC::CondCodes CondCode = IntCCToARMCC(CC); + ARMISD::NodeType CompareType; + switch (CondCode) { + default: + CompareType = ARMISD::CMP; + break; + case ARMCC::EQ: + case ARMCC::NE: + // Uses only Z Flag + CompareType = ARMISD::CMPZ; + break; + } + ARMCC = DAG.getConstant(CondCode, MVT::i32); + return DAG.getNode(CompareType, dl, MVT::Flag, LHS, RHS); +} + +/// Returns a appropriate VFP CMP (fcmp{s|d}+fmstat) for the given operands. +static SDValue getVFPCmp(SDValue LHS, SDValue RHS, SelectionDAG &DAG, + DebugLoc dl) { + SDValue Cmp; + if (!isFloatingPointZero(RHS)) + Cmp = DAG.getNode(ARMISD::CMPFP, dl, MVT::Flag, LHS, RHS); + else + Cmp = DAG.getNode(ARMISD::CMPFPw0, dl, MVT::Flag, LHS); + return DAG.getNode(ARMISD::FMSTAT, dl, MVT::Flag, Cmp); +} + +SDValue ARMTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const { + EVT VT = Op.getValueType(); + SDValue LHS = Op.getOperand(0); + SDValue RHS = Op.getOperand(1); + ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get(); + SDValue TrueVal = Op.getOperand(2); + SDValue FalseVal = Op.getOperand(3); + DebugLoc dl = Op.getDebugLoc(); + + if (LHS.getValueType() == MVT::i32) { + SDValue ARMCC; + SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32); + SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, dl); + return DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal, ARMCC, CCR,Cmp); + } + + ARMCC::CondCodes CondCode, CondCode2; + FPCCToARMCC(CC, CondCode, CondCode2); + + SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32); + SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32); + SDValue Cmp = getVFPCmp(LHS, RHS, DAG, dl); + SDValue Result = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal, + ARMCC, CCR, Cmp); + if (CondCode2 != ARMCC::AL) { + SDValue ARMCC2 = DAG.getConstant(CondCode2, MVT::i32); + // FIXME: Needs another CMP because flag can have but one use. + SDValue Cmp2 = getVFPCmp(LHS, RHS, DAG, dl); + Result = DAG.getNode(ARMISD::CMOV, dl, VT, + Result, TrueVal, ARMCC2, CCR, Cmp2); + } + return Result; +} + +SDValue ARMTargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) const { + SDValue Chain = Op.getOperand(0); + ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get(); + SDValue LHS = Op.getOperand(2); + SDValue RHS = Op.getOperand(3); + SDValue Dest = Op.getOperand(4); + DebugLoc dl = Op.getDebugLoc(); + + if (LHS.getValueType() == MVT::i32) { + SDValue ARMCC; + SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32); + SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, dl); + return DAG.getNode(ARMISD::BRCOND, dl, MVT::Other, + Chain, Dest, ARMCC, CCR,Cmp); + } + + assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64); + ARMCC::CondCodes CondCode, CondCode2; + FPCCToARMCC(CC, CondCode, CondCode2); + + SDValue Cmp = getVFPCmp(LHS, RHS, DAG, dl); + SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32); + SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32); + SDVTList VTList = DAG.getVTList(MVT::Other, MVT::Flag); + SDValue Ops[] = { Chain, Dest, ARMCC, CCR, Cmp }; + SDValue Res = DAG.getNode(ARMISD::BRCOND, dl, VTList, Ops, 5); + if (CondCode2 != ARMCC::AL) { + ARMCC = DAG.getConstant(CondCode2, MVT::i32); + SDValue Ops[] = { Res, Dest, ARMCC, CCR, Res.getValue(1) }; + Res = DAG.getNode(ARMISD::BRCOND, dl, VTList, Ops, 5); + } + return Res; +} + +SDValue ARMTargetLowering::LowerBR_JT(SDValue Op, SelectionDAG &DAG) const { + SDValue Chain = Op.getOperand(0); + SDValue Table = Op.getOperand(1); + SDValue Index = Op.getOperand(2); + DebugLoc dl = Op.getDebugLoc(); + + EVT PTy = getPointerTy(); + JumpTableSDNode *JT = cast<JumpTableSDNode>(Table); + ARMFunctionInfo *AFI = DAG.getMachineFunction().getInfo<ARMFunctionInfo>(); + SDValue UId = DAG.getConstant(AFI->createJumpTableUId(), PTy); + SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PTy); + Table = DAG.getNode(ARMISD::WrapperJT, dl, MVT::i32, JTI, UId); + Index = DAG.getNode(ISD::MUL, dl, PTy, Index, DAG.getConstant(4, PTy)); + SDValue Addr = DAG.getNode(ISD::ADD, dl, PTy, Index, Table); + if (Subtarget->isThumb2()) { + // Thumb2 uses a two-level jump. That is, it jumps into the jump table + // which does another jump to the destination. This also makes it easier + // to translate it to TBB / TBH later. + // FIXME: This might not work if the function is extremely large. + return DAG.getNode(ARMISD::BR2_JT, dl, MVT::Other, Chain, + Addr, Op.getOperand(2), JTI, UId); + } + if (getTargetMachine().getRelocationModel() == Reloc::PIC_) { + Addr = DAG.getLoad((EVT)MVT::i32, dl, Chain, Addr, + PseudoSourceValue::getJumpTable(), 0, + false, false, 0); + Chain = Addr.getValue(1); + Addr = DAG.getNode(ISD::ADD, dl, PTy, Addr, Table); + return DAG.getNode(ARMISD::BR_JT, dl, MVT::Other, Chain, Addr, JTI, UId); + } else { + Addr = DAG.getLoad(PTy, dl, Chain, Addr, + PseudoSourceValue::getJumpTable(), 0, false, false, 0); + Chain = Addr.getValue(1); + return DAG.getNode(ARMISD::BR_JT, dl, MVT::Other, Chain, Addr, JTI, UId); + } +} + +static SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG) { + DebugLoc dl = Op.getDebugLoc(); + unsigned Opc; + + switch (Op.getOpcode()) { + default: + assert(0 && "Invalid opcode!"); + case ISD::FP_TO_SINT: + Opc = ARMISD::FTOSI; + break; + case ISD::FP_TO_UINT: + Opc = ARMISD::FTOUI; + break; + } + Op = DAG.getNode(Opc, dl, MVT::f32, Op.getOperand(0)); + return DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i32, Op); +} + +static SDValue LowerINT_TO_FP(SDValue Op, SelectionDAG &DAG) { + EVT VT = Op.getValueType(); + DebugLoc dl = Op.getDebugLoc(); + unsigned Opc; + + switch (Op.getOpcode()) { + default: + assert(0 && "Invalid opcode!"); + case ISD::SINT_TO_FP: + Opc = ARMISD::SITOF; + break; + case ISD::UINT_TO_FP: + Opc = ARMISD::UITOF; + break; + } + + Op = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f32, Op.getOperand(0)); + return DAG.getNode(Opc, dl, VT, Op); +} + +static SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) { + // Implement fcopysign with a fabs and a conditional fneg. + SDValue Tmp0 = Op.getOperand(0); + SDValue Tmp1 = Op.getOperand(1); + DebugLoc dl = Op.getDebugLoc(); + EVT VT = Op.getValueType(); + EVT SrcVT = Tmp1.getValueType(); + SDValue AbsVal = DAG.getNode(ISD::FABS, dl, VT, Tmp0); + SDValue Cmp = getVFPCmp(Tmp1, DAG.getConstantFP(0.0, SrcVT), DAG, dl); + SDValue ARMCC = DAG.getConstant(ARMCC::LT, MVT::i32); + SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32); + return DAG.getNode(ARMISD::CNEG, dl, VT, AbsVal, AbsVal, ARMCC, CCR, Cmp); +} + +SDValue ARMTargetLowering::LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const{ + MachineFunction &MF = DAG.getMachineFunction(); + MachineFrameInfo *MFI = MF.getFrameInfo(); + MFI->setReturnAddressIsTaken(true); + + EVT VT = Op.getValueType(); + DebugLoc dl = Op.getDebugLoc(); + unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue(); + if (Depth) { + SDValue FrameAddr = LowerFRAMEADDR(Op, DAG); + SDValue Offset = DAG.getConstant(4, MVT::i32); + return DAG.getLoad(VT, dl, DAG.getEntryNode(), + DAG.getNode(ISD::ADD, dl, VT, FrameAddr, Offset), + NULL, 0, false, false, 0); + } + + // Return LR, which contains the return address. Mark it an implicit live-in. + unsigned Reg = MF.addLiveIn(ARM::LR, ARM::GPRRegisterClass); + return DAG.getCopyFromReg(DAG.getEntryNode(), dl, Reg, VT); +} + +SDValue ARMTargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const { + MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo(); + MFI->setFrameAddressIsTaken(true); + + EVT VT = Op.getValueType(); + DebugLoc dl = Op.getDebugLoc(); // FIXME probably not meaningful + unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue(); + unsigned FrameReg = (Subtarget->isThumb() || Subtarget->isTargetDarwin()) + ? ARM::R7 : ARM::R11; + SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg, VT); + while (Depth--) + FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr, NULL, 0, + false, false, 0); + return FrameAddr; +} + +/// ExpandBIT_CONVERT - If the target supports VFP, this function is called to +/// expand a bit convert where either the source or destination type is i64 to +/// use a VMOVDRR or VMOVRRD node. This should not be done when the non-i64 +/// operand type is illegal (e.g., v2f32 for a target that doesn't support +/// vectors), since the legalizer won't know what to do with that. +static SDValue ExpandBIT_CONVERT(SDNode *N, SelectionDAG &DAG) { + const TargetLowering &TLI = DAG.getTargetLoweringInfo(); + DebugLoc dl = N->getDebugLoc(); + SDValue Op = N->getOperand(0); + + // This function is only supposed to be called for i64 types, either as the + // source or destination of the bit convert. + EVT SrcVT = Op.getValueType(); + EVT DstVT = N->getValueType(0); + assert((SrcVT == MVT::i64 || DstVT == MVT::i64) && + "ExpandBIT_CONVERT called for non-i64 type"); + + // Turn i64->f64 into VMOVDRR. + if (SrcVT == MVT::i64 && TLI.isTypeLegal(DstVT)) { + SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Op, + DAG.getConstant(0, MVT::i32)); + SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Op, + DAG.getConstant(1, MVT::i32)); + return DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi); + } + + // Turn f64->i64 into VMOVRRD. + if (DstVT == MVT::i64 && TLI.isTypeLegal(SrcVT)) { + SDValue Cvt = DAG.getNode(ARMISD::VMOVRRD, dl, + DAG.getVTList(MVT::i32, MVT::i32), &Op, 1); + // Merge the pieces into a single i64 value. + return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Cvt, Cvt.getValue(1)); + } + + return SDValue(); +} + +/// getZeroVector - Returns a vector of specified type with all zero elements. +/// +static SDValue getZeroVector(EVT VT, SelectionDAG &DAG, DebugLoc dl) { + assert(VT.isVector() && "Expected a vector type"); + + // Zero vectors are used to represent vector negation and in those cases + // will be implemented with the NEON VNEG instruction. However, VNEG does + // not support i64 elements, so sometimes the zero vectors will need to be + // explicitly constructed. For those cases, and potentially other uses in + // the future, always build zero vectors as <16 x i8> or <8 x i8> bitcasted + // to their dest type. This ensures they get CSE'd. + SDValue Vec; + SDValue Cst = DAG.getTargetConstant(0, MVT::i8); + SmallVector<SDValue, 8> Ops; + MVT TVT; + + if (VT.getSizeInBits() == 64) { + Ops.assign(8, Cst); TVT = MVT::v8i8; + } else { + Ops.assign(16, Cst); TVT = MVT::v16i8; + } + Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, TVT, &Ops[0], Ops.size()); + + return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Vec); +} + +/// getOnesVector - Returns a vector of specified type with all bits set. +/// +static SDValue getOnesVector(EVT VT, SelectionDAG &DAG, DebugLoc dl) { + assert(VT.isVector() && "Expected a vector type"); + + // Always build ones vectors as <16 x i8> or <8 x i8> bitcasted to their + // dest type. This ensures they get CSE'd. + SDValue Vec; + SDValue Cst = DAG.getTargetConstant(0xFF, MVT::i8); + SmallVector<SDValue, 8> Ops; + MVT TVT; + + if (VT.getSizeInBits() == 64) { + Ops.assign(8, Cst); TVT = MVT::v8i8; + } else { + Ops.assign(16, Cst); TVT = MVT::v16i8; + } + Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, TVT, &Ops[0], Ops.size()); + + return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Vec); +} + +/// LowerShiftRightParts - Lower SRA_PARTS, which returns two +/// i32 values and take a 2 x i32 value to shift plus a shift amount. +SDValue ARMTargetLowering::LowerShiftRightParts(SDValue Op, + SelectionDAG &DAG) const { + assert(Op.getNumOperands() == 3 && "Not a double-shift!"); + EVT VT = Op.getValueType(); + unsigned VTBits = VT.getSizeInBits(); + DebugLoc dl = Op.getDebugLoc(); + SDValue ShOpLo = Op.getOperand(0); + SDValue ShOpHi = Op.getOperand(1); + SDValue ShAmt = Op.getOperand(2); + SDValue ARMCC; + unsigned Opc = (Op.getOpcode() == ISD::SRA_PARTS) ? ISD::SRA : ISD::SRL; + + assert(Op.getOpcode() == ISD::SRA_PARTS || Op.getOpcode() == ISD::SRL_PARTS); + + SDValue RevShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32, + DAG.getConstant(VTBits, MVT::i32), ShAmt); + SDValue Tmp1 = DAG.getNode(ISD::SRL, dl, VT, ShOpLo, ShAmt); + SDValue ExtraShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32, ShAmt, + DAG.getConstant(VTBits, MVT::i32)); + SDValue Tmp2 = DAG.getNode(ISD::SHL, dl, VT, ShOpHi, RevShAmt); + SDValue FalseVal = DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2); + SDValue TrueVal = DAG.getNode(Opc, dl, VT, ShOpHi, ExtraShAmt); + + SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32); + SDValue Cmp = getARMCmp(ExtraShAmt, DAG.getConstant(0, MVT::i32), ISD::SETGE, + ARMCC, DAG, dl); + SDValue Hi = DAG.getNode(Opc, dl, VT, ShOpHi, ShAmt); + SDValue Lo = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal, ARMCC, + CCR, Cmp); + + SDValue Ops[2] = { Lo, Hi }; + return DAG.getMergeValues(Ops, 2, dl); +} + +/// LowerShiftLeftParts - Lower SHL_PARTS, which returns two +/// i32 values and take a 2 x i32 value to shift plus a shift amount. +SDValue ARMTargetLowering::LowerShiftLeftParts(SDValue Op, + SelectionDAG &DAG) const { + assert(Op.getNumOperands() == 3 && "Not a double-shift!"); + EVT VT = Op.getValueType(); + unsigned VTBits = VT.getSizeInBits(); + DebugLoc dl = Op.getDebugLoc(); + SDValue ShOpLo = Op.getOperand(0); + SDValue ShOpHi = Op.getOperand(1); + SDValue ShAmt = Op.getOperand(2); + SDValue ARMCC; + + assert(Op.getOpcode() == ISD::SHL_PARTS); + SDValue RevShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32, + DAG.getConstant(VTBits, MVT::i32), ShAmt); + SDValue Tmp1 = DAG.getNode(ISD::SRL, dl, VT, ShOpLo, RevShAmt); + SDValue ExtraShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32, ShAmt, + DAG.getConstant(VTBits, MVT::i32)); + SDValue Tmp2 = DAG.getNode(ISD::SHL, dl, VT, ShOpHi, ShAmt); + SDValue Tmp3 = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, ExtraShAmt); + + SDValue FalseVal = DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2); + SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32); + SDValue Cmp = getARMCmp(ExtraShAmt, DAG.getConstant(0, MVT::i32), ISD::SETGE, + ARMCC, DAG, dl); + SDValue Lo = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, ShAmt); + SDValue Hi = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, Tmp3, ARMCC, + CCR, Cmp); + + SDValue Ops[2] = { Lo, Hi }; + return DAG.getMergeValues(Ops, 2, dl); +} + +static SDValue LowerCTTZ(SDNode *N, SelectionDAG &DAG, + const ARMSubtarget *ST) { + EVT VT = N->getValueType(0); + DebugLoc dl = N->getDebugLoc(); + + if (!ST->hasV6T2Ops()) + return SDValue(); + + SDValue rbit = DAG.getNode(ARMISD::RBIT, dl, VT, N->getOperand(0)); + return DAG.getNode(ISD::CTLZ, dl, VT, rbit); +} + +static SDValue LowerShift(SDNode *N, SelectionDAG &DAG, + const ARMSubtarget *ST) { + EVT VT = N->getValueType(0); + DebugLoc dl = N->getDebugLoc(); + + // Lower vector shifts on NEON to use VSHL. + if (VT.isVector()) { + assert(ST->hasNEON() && "unexpected vector shift"); + + // Left shifts translate directly to the vshiftu intrinsic. + if (N->getOpcode() == ISD::SHL) + return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, VT, + DAG.getConstant(Intrinsic::arm_neon_vshiftu, MVT::i32), + N->getOperand(0), N->getOperand(1)); + + assert((N->getOpcode() == ISD::SRA || + N->getOpcode() == ISD::SRL) && "unexpected vector shift opcode"); + + // NEON uses the same intrinsics for both left and right shifts. For + // right shifts, the shift amounts are negative, so negate the vector of + // shift amounts. + EVT ShiftVT = N->getOperand(1).getValueType(); + SDValue NegatedCount = DAG.getNode(ISD::SUB, dl, ShiftVT, + getZeroVector(ShiftVT, DAG, dl), + N->getOperand(1)); + Intrinsic::ID vshiftInt = (N->getOpcode() == ISD::SRA ? + Intrinsic::arm_neon_vshifts : + Intrinsic::arm_neon_vshiftu); + return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, VT, + DAG.getConstant(vshiftInt, MVT::i32), + N->getOperand(0), NegatedCount); + } + + // We can get here for a node like i32 = ISD::SHL i32, i64 + if (VT != MVT::i64) + return SDValue(); + + assert((N->getOpcode() == ISD::SRL || N->getOpcode() == ISD::SRA) && + "Unknown shift to lower!"); + + // We only lower SRA, SRL of 1 here, all others use generic lowering. + if (!isa<ConstantSDNode>(N->getOperand(1)) || + cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() != 1) + return SDValue(); + + // If we are in thumb mode, we don't have RRX. + if (ST->isThumb1Only()) return SDValue(); + + // Okay, we have a 64-bit SRA or SRL of 1. Lower this to an RRX expr. + SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, N->getOperand(0), + DAG.getConstant(0, MVT::i32)); + SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, N->getOperand(0), + DAG.getConstant(1, MVT::i32)); + + // First, build a SRA_FLAG/SRL_FLAG op, which shifts the top part by one and + // captures the result into a carry flag. + unsigned Opc = N->getOpcode() == ISD::SRL ? ARMISD::SRL_FLAG:ARMISD::SRA_FLAG; + Hi = DAG.getNode(Opc, dl, DAG.getVTList(MVT::i32, MVT::Flag), &Hi, 1); + + // The low part is an ARMISD::RRX operand, which shifts the carry in. + Lo = DAG.getNode(ARMISD::RRX, dl, MVT::i32, Lo, Hi.getValue(1)); + + // Merge the pieces into a single i64 value. + return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi); +} + +static SDValue LowerVSETCC(SDValue Op, SelectionDAG &DAG) { + SDValue TmpOp0, TmpOp1; + bool Invert = false; + bool Swap = false; + unsigned Opc = 0; + + SDValue Op0 = Op.getOperand(0); + SDValue Op1 = Op.getOperand(1); + SDValue CC = Op.getOperand(2); + EVT VT = Op.getValueType(); + ISD::CondCode SetCCOpcode = cast<CondCodeSDNode>(CC)->get(); + DebugLoc dl = Op.getDebugLoc(); + + if (Op.getOperand(1).getValueType().isFloatingPoint()) { + switch (SetCCOpcode) { + default: llvm_unreachable("Illegal FP comparison"); break; + case ISD::SETUNE: + case ISD::SETNE: Invert = true; // Fallthrough + case ISD::SETOEQ: + case ISD::SETEQ: Opc = ARMISD::VCEQ; break; + case ISD::SETOLT: + case ISD::SETLT: Swap = true; // Fallthrough + case ISD::SETOGT: + case ISD::SETGT: Opc = ARMISD::VCGT; break; + case ISD::SETOLE: + case ISD::SETLE: Swap = true; // Fallthrough + case ISD::SETOGE: + case ISD::SETGE: Opc = ARMISD::VCGE; break; + case ISD::SETUGE: Swap = true; // Fallthrough + case ISD::SETULE: Invert = true; Opc = ARMISD::VCGT; break; + case ISD::SETUGT: Swap = true; // Fallthrough + case ISD::SETULT: Invert = true; Opc = ARMISD::VCGE; break; + case ISD::SETUEQ: Invert = true; // Fallthrough + case ISD::SETONE: + // Expand this to (OLT | OGT). + TmpOp0 = Op0; + TmpOp1 = Op1; + Opc = ISD::OR; + Op0 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp1, TmpOp0); + Op1 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp0, TmpOp1); + break; + case ISD::SETUO: Invert = true; // Fallthrough + case ISD::SETO: + // Expand this to (OLT | OGE). + TmpOp0 = Op0; + TmpOp1 = Op1; + Opc = ISD::OR; + Op0 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp1, TmpOp0); + Op1 = DAG.getNode(ARMISD::VCGE, dl, VT, TmpOp0, TmpOp1); + break; + } + } else { + // Integer comparisons. + switch (SetCCOpcode) { + default: llvm_unreachable("Illegal integer comparison"); break; + case ISD::SETNE: Invert = true; + case ISD::SETEQ: Opc = ARMISD::VCEQ; break; + case ISD::SETLT: Swap = true; + case ISD::SETGT: Opc = ARMISD::VCGT; break; + case ISD::SETLE: Swap = true; + case ISD::SETGE: Opc = ARMISD::VCGE; break; + case ISD::SETULT: Swap = true; + case ISD::SETUGT: Opc = ARMISD::VCGTU; break; + case ISD::SETULE: Swap = true; + case ISD::SETUGE: Opc = ARMISD::VCGEU; break; + } + + // Detect VTST (Vector Test Bits) = icmp ne (and (op0, op1), zero). + if (Opc == ARMISD::VCEQ) { + + SDValue AndOp; + if (ISD::isBuildVectorAllZeros(Op1.getNode())) + AndOp = Op0; + else if (ISD::isBuildVectorAllZeros(Op0.getNode())) + AndOp = Op1; + + // Ignore bitconvert. + if (AndOp.getNode() && AndOp.getOpcode() == ISD::BIT_CONVERT) + AndOp = AndOp.getOperand(0); + + if (AndOp.getNode() && AndOp.getOpcode() == ISD::AND) { + Opc = ARMISD::VTST; + Op0 = DAG.getNode(ISD::BIT_CONVERT, dl, VT, AndOp.getOperand(0)); + Op1 = DAG.getNode(ISD::BIT_CONVERT, dl, VT, AndOp.getOperand(1)); + Invert = !Invert; + } + } + } + + if (Swap) + std::swap(Op0, Op1); + + SDValue Result = DAG.getNode(Opc, dl, VT, Op0, Op1); + + if (Invert) + Result = DAG.getNOT(dl, Result, VT); + + return Result; +} + +/// isVMOVSplat - Check if the specified splat value corresponds to an immediate +/// VMOV instruction, and if so, return the constant being splatted. +static SDValue isVMOVSplat(uint64_t SplatBits, uint64_t SplatUndef, + unsigned SplatBitSize, SelectionDAG &DAG) { + switch (SplatBitSize) { + case 8: + // Any 1-byte value is OK. + assert((SplatBits & ~0xff) == 0 && "one byte splat value is too big"); + return DAG.getTargetConstant(SplatBits, MVT::i8); + + case 16: + // NEON's 16-bit VMOV supports splat values where only one byte is nonzero. + if ((SplatBits & ~0xff) == 0 || + (SplatBits & ~0xff00) == 0) + return DAG.getTargetConstant(SplatBits, MVT::i16); + break; + + case 32: + // NEON's 32-bit VMOV supports splat values where: + // * only one byte is nonzero, or + // * the least significant byte is 0xff and the second byte is nonzero, or + // * the least significant 2 bytes are 0xff and the third is nonzero. + if ((SplatBits & ~0xff) == 0 || + (SplatBits & ~0xff00) == 0 || + (SplatBits & ~0xff0000) == 0 || + (SplatBits & ~0xff000000) == 0) + return DAG.getTargetConstant(SplatBits, MVT::i32); + + if ((SplatBits & ~0xffff) == 0 && + ((SplatBits | SplatUndef) & 0xff) == 0xff) + return DAG.getTargetConstant(SplatBits | 0xff, MVT::i32); + + if ((SplatBits & ~0xffffff) == 0 && + ((SplatBits | SplatUndef) & 0xffff) == 0xffff) + return DAG.getTargetConstant(SplatBits | 0xffff, MVT::i32); + + // Note: there are a few 32-bit splat values (specifically: 00ffff00, + // ff000000, ff0000ff, and ffff00ff) that are valid for VMOV.I64 but not + // VMOV.I32. A (very) minor optimization would be to replicate the value + // and fall through here to test for a valid 64-bit splat. But, then the + // caller would also need to check and handle the change in size. + break; + + case 64: { + // NEON has a 64-bit VMOV splat where each byte is either 0 or 0xff. + uint64_t BitMask = 0xff; + uint64_t Val = 0; + for (int ByteNum = 0; ByteNum < 8; ++ByteNum) { + if (((SplatBits | SplatUndef) & BitMask) == BitMask) + Val |= BitMask; + else if ((SplatBits & BitMask) != 0) + return SDValue(); + BitMask <<= 8; + } + return DAG.getTargetConstant(Val, MVT::i64); + } + + default: + llvm_unreachable("unexpected size for isVMOVSplat"); + break; + } + + return SDValue(); +} + +/// getVMOVImm - If this is a build_vector of constants which can be +/// formed by using a VMOV instruction of the specified element size, +/// return the constant being splatted. The ByteSize field indicates the +/// number of bytes of each element [1248]. +SDValue ARM::getVMOVImm(SDNode *N, unsigned ByteSize, SelectionDAG &DAG) { + BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(N); + APInt SplatBits, SplatUndef; + unsigned SplatBitSize; + bool HasAnyUndefs; + if (! BVN || ! BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize, + HasAnyUndefs, ByteSize * 8)) + return SDValue(); + + if (SplatBitSize > ByteSize * 8) + return SDValue(); + + return isVMOVSplat(SplatBits.getZExtValue(), SplatUndef.getZExtValue(), + SplatBitSize, DAG); +} + +static bool isVEXTMask(const SmallVectorImpl<int> &M, EVT VT, + bool &ReverseVEXT, unsigned &Imm) { + unsigned NumElts = VT.getVectorNumElements(); + ReverseVEXT = false; + Imm = M[0]; + + // If this is a VEXT shuffle, the immediate value is the index of the first + // element. The other shuffle indices must be the successive elements after + // the first one. + unsigned ExpectedElt = Imm; + for (unsigned i = 1; i < NumElts; ++i) { + // Increment the expected index. If it wraps around, it may still be + // a VEXT but the source vectors must be swapped. + ExpectedElt += 1; + if (ExpectedElt == NumElts * 2) { + ExpectedElt = 0; + ReverseVEXT = true; + } + + if (ExpectedElt != static_cast<unsigned>(M[i])) + return false; + } + + // Adjust the index value if the source operands will be swapped. + if (ReverseVEXT) + Imm -= NumElts; + + return true; +} + +/// isVREVMask - Check if a vector shuffle corresponds to a VREV +/// instruction with the specified blocksize. (The order of the elements +/// within each block of the vector is reversed.) +static bool isVREVMask(const SmallVectorImpl<int> &M, EVT VT, + unsigned BlockSize) { + assert((BlockSize==16 || BlockSize==32 || BlockSize==64) && + "Only possible block sizes for VREV are: 16, 32, 64"); + + unsigned EltSz = VT.getVectorElementType().getSizeInBits(); + if (EltSz == 64) + return false; + + unsigned NumElts = VT.getVectorNumElements(); + unsigned BlockElts = M[0] + 1; + + if (BlockSize <= EltSz || BlockSize != BlockElts * EltSz) + return false; + + for (unsigned i = 0; i < NumElts; ++i) { + if ((unsigned) M[i] != + (i - i%BlockElts) + (BlockElts - 1 - i%BlockElts)) + return false; + } + + return true; +} + +static bool isVTRNMask(const SmallVectorImpl<int> &M, EVT VT, + unsigned &WhichResult) { + unsigned EltSz = VT.getVectorElementType().getSizeInBits(); + if (EltSz == 64) + return false; + + unsigned NumElts = VT.getVectorNumElements(); + WhichResult = (M[0] == 0 ? 0 : 1); + for (unsigned i = 0; i < NumElts; i += 2) { + if ((unsigned) M[i] != i + WhichResult || + (unsigned) M[i+1] != i + NumElts + WhichResult) + return false; + } + return true; +} + +/// isVTRN_v_undef_Mask - Special case of isVTRNMask for canonical form of +/// "vector_shuffle v, v", i.e., "vector_shuffle v, undef". +/// Mask is e.g., <0, 0, 2, 2> instead of <0, 4, 2, 6>. +static bool isVTRN_v_undef_Mask(const SmallVectorImpl<int> &M, EVT VT, + unsigned &WhichResult) { + unsigned EltSz = VT.getVectorElementType().getSizeInBits(); + if (EltSz == 64) + return false; + + unsigned NumElts = VT.getVectorNumElements(); + WhichResult = (M[0] == 0 ? 0 : 1); + for (unsigned i = 0; i < NumElts; i += 2) { + if ((unsigned) M[i] != i + WhichResult || + (unsigned) M[i+1] != i + WhichResult) + return false; + } + return true; +} + +static bool isVUZPMask(const SmallVectorImpl<int> &M, EVT VT, + unsigned &WhichResult) { + unsigned EltSz = VT.getVectorElementType().getSizeInBits(); + if (EltSz == 64) + return false; + + unsigned NumElts = VT.getVectorNumElements(); + WhichResult = (M[0] == 0 ? 0 : 1); + for (unsigned i = 0; i != NumElts; ++i) { + if ((unsigned) M[i] != 2 * i + WhichResult) + return false; + } + + // VUZP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32. + if (VT.is64BitVector() && EltSz == 32) + return false; + + return true; +} + +/// isVUZP_v_undef_Mask - Special case of isVUZPMask for canonical form of +/// "vector_shuffle v, v", i.e., "vector_shuffle v, undef". +/// Mask is e.g., <0, 2, 0, 2> instead of <0, 2, 4, 6>, +static bool isVUZP_v_undef_Mask(const SmallVectorImpl<int> &M, EVT VT, + unsigned &WhichResult) { + unsigned EltSz = VT.getVectorElementType().getSizeInBits(); + if (EltSz == 64) + return false; + + unsigned Half = VT.getVectorNumElements() / 2; + WhichResult = (M[0] == 0 ? 0 : 1); + for (unsigned j = 0; j != 2; ++j) { + unsigned Idx = WhichResult; + for (unsigned i = 0; i != Half; ++i) { + if ((unsigned) M[i + j * Half] != Idx) + return false; + Idx += 2; + } + } + + // VUZP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32. + if (VT.is64BitVector() && EltSz == 32) + return false; + + return true; +} + +static bool isVZIPMask(const SmallVectorImpl<int> &M, EVT VT, + unsigned &WhichResult) { + unsigned EltSz = VT.getVectorElementType().getSizeInBits(); + if (EltSz == 64) + return false; + + unsigned NumElts = VT.getVectorNumElements(); + WhichResult = (M[0] == 0 ? 0 : 1); + unsigned Idx = WhichResult * NumElts / 2; + for (unsigned i = 0; i != NumElts; i += 2) { + if ((unsigned) M[i] != Idx || + (unsigned) M[i+1] != Idx + NumElts) + return false; + Idx += 1; + } + + // VZIP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32. + if (VT.is64BitVector() && EltSz == 32) + return false; + + return true; +} + +/// isVZIP_v_undef_Mask - Special case of isVZIPMask for canonical form of +/// "vector_shuffle v, v", i.e., "vector_shuffle v, undef". +/// Mask is e.g., <0, 0, 1, 1> instead of <0, 4, 1, 5>. +static bool isVZIP_v_undef_Mask(const SmallVectorImpl<int> &M, EVT VT, + unsigned &WhichResult) { + unsigned EltSz = VT.getVectorElementType().getSizeInBits(); + if (EltSz == 64) + return false; + + unsigned NumElts = VT.getVectorNumElements(); + WhichResult = (M[0] == 0 ? 0 : 1); + unsigned Idx = WhichResult * NumElts / 2; + for (unsigned i = 0; i != NumElts; i += 2) { + if ((unsigned) M[i] != Idx || + (unsigned) M[i+1] != Idx) + return false; + Idx += 1; + } + + // VZIP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32. + if (VT.is64BitVector() && EltSz == 32) + return false; + + return true; +} + + +static SDValue BuildSplat(SDValue Val, EVT VT, SelectionDAG &DAG, DebugLoc dl) { + // Canonicalize all-zeros and all-ones vectors. + ConstantSDNode *ConstVal = cast<ConstantSDNode>(Val.getNode()); + if (ConstVal->isNullValue()) + return getZeroVector(VT, DAG, dl); + if (ConstVal->isAllOnesValue()) + return getOnesVector(VT, DAG, dl); + + EVT CanonicalVT; + if (VT.is64BitVector()) { + switch (Val.getValueType().getSizeInBits()) { + case 8: CanonicalVT = MVT::v8i8; break; + case 16: CanonicalVT = MVT::v4i16; break; + case 32: CanonicalVT = MVT::v2i32; break; + case 64: CanonicalVT = MVT::v1i64; break; + default: llvm_unreachable("unexpected splat element type"); break; + } + } else { + assert(VT.is128BitVector() && "unknown splat vector size"); + switch (Val.getValueType().getSizeInBits()) { + case 8: CanonicalVT = MVT::v16i8; break; + case 16: CanonicalVT = MVT::v8i16; break; + case 32: CanonicalVT = MVT::v4i32; break; + case 64: CanonicalVT = MVT::v2i64; break; + default: llvm_unreachable("unexpected splat element type"); break; + } + } + + // Build a canonical splat for this value. + SmallVector<SDValue, 8> Ops; + Ops.assign(CanonicalVT.getVectorNumElements(), Val); + SDValue Res = DAG.getNode(ISD::BUILD_VECTOR, dl, CanonicalVT, &Ops[0], + Ops.size()); + return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Res); +} + +// If this is a case we can't handle, return null and let the default +// expansion code take care of it. +static SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) { + BuildVectorSDNode *BVN = cast<BuildVectorSDNode>(Op.getNode()); + DebugLoc dl = Op.getDebugLoc(); + EVT VT = Op.getValueType(); + + APInt SplatBits, SplatUndef; + unsigned SplatBitSize; + bool HasAnyUndefs; + if (BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize, HasAnyUndefs)) { + if (SplatBitSize <= 64) { + SDValue Val = isVMOVSplat(SplatBits.getZExtValue(), + SplatUndef.getZExtValue(), SplatBitSize, DAG); + if (Val.getNode()) + return BuildSplat(Val, VT, DAG, dl); + } + } + + // Scan through the operands to see if only one value is used. + unsigned NumElts = VT.getVectorNumElements(); + bool isOnlyLowElement = true; + bool usesOnlyOneValue = true; + bool isConstant = true; + SDValue Value; + for (unsigned i = 0; i < NumElts; ++i) { + SDValue V = Op.getOperand(i); + if (V.getOpcode() == ISD::UNDEF) + continue; + if (i > 0) + isOnlyLowElement = false; + if (!isa<ConstantFPSDNode>(V) && !isa<ConstantSDNode>(V)) + isConstant = false; + + if (!Value.getNode()) + Value = V; + else if (V != Value) + usesOnlyOneValue = false; + } + + if (!Value.getNode()) + return DAG.getUNDEF(VT); + + if (isOnlyLowElement) + return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Value); + + // If all elements are constants, fall back to the default expansion, which + // will generate a load from the constant pool. + if (isConstant) + return SDValue(); + + // Use VDUP for non-constant splats. + unsigned EltSize = VT.getVectorElementType().getSizeInBits(); + if (usesOnlyOneValue && EltSize <= 32) + return DAG.getNode(ARMISD::VDUP, dl, VT, Value); + + // Vectors with 32- or 64-bit elements can be built by directly assigning + // the subregisters. + if (EltSize >= 32) { + // Do the expansion with floating-point types, since that is what the VFP + // registers are defined to use, and since i64 is not legal. + EVT EltVT = EVT::getFloatingPointVT(EltSize); + EVT VecVT = EVT::getVectorVT(*DAG.getContext(), EltVT, NumElts); + SDValue Val = DAG.getUNDEF(VecVT); + for (unsigned i = 0; i < NumElts; ++i) { + SDValue Elt = Op.getOperand(i); + if (Elt.getOpcode() == ISD::UNDEF) + continue; + Elt = DAG.getNode(ISD::BIT_CONVERT, dl, EltVT, Elt); + Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VecVT, Val, Elt, + DAG.getConstant(i, MVT::i32)); + } + return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Val); + } + + return SDValue(); +} + +/// isShuffleMaskLegal - Targets can use this to indicate that they only +/// support *some* VECTOR_SHUFFLE operations, those with specific masks. +/// By default, if a target supports the VECTOR_SHUFFLE node, all mask values +/// are assumed to be legal. +bool +ARMTargetLowering::isShuffleMaskLegal(const SmallVectorImpl<int> &M, + EVT VT) const { + if (VT.getVectorNumElements() == 4 && + (VT.is128BitVector() || VT.is64BitVector())) { + unsigned PFIndexes[4]; + for (unsigned i = 0; i != 4; ++i) { + if (M[i] < 0) + PFIndexes[i] = 8; + else + PFIndexes[i] = M[i]; + } + + // Compute the index in the perfect shuffle table. + unsigned PFTableIndex = + PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3]; + unsigned PFEntry = PerfectShuffleTable[PFTableIndex]; + unsigned Cost = (PFEntry >> 30); + + if (Cost <= 4) + return true; + } + + bool ReverseVEXT; + unsigned Imm, WhichResult; + + return (ShuffleVectorSDNode::isSplatMask(&M[0], VT) || + isVREVMask(M, VT, 64) || + isVREVMask(M, VT, 32) || + isVREVMask(M, VT, 16) || + isVEXTMask(M, VT, ReverseVEXT, Imm) || + isVTRNMask(M, VT, WhichResult) || + isVUZPMask(M, VT, WhichResult) || + isVZIPMask(M, VT, WhichResult) || + isVTRN_v_undef_Mask(M, VT, WhichResult) || + isVUZP_v_undef_Mask(M, VT, WhichResult) || + isVZIP_v_undef_Mask(M, VT, WhichResult)); +} + +/// GeneratePerfectShuffle - Given an entry in the perfect-shuffle table, emit +/// the specified operations to build the shuffle. +static SDValue GeneratePerfectShuffle(unsigned PFEntry, SDValue LHS, + SDValue RHS, SelectionDAG &DAG, + DebugLoc dl) { + unsigned OpNum = (PFEntry >> 26) & 0x0F; + unsigned LHSID = (PFEntry >> 13) & ((1 << 13)-1); + unsigned RHSID = (PFEntry >> 0) & ((1 << 13)-1); + + enum { + OP_COPY = 0, // Copy, used for things like <u,u,u,3> to say it is <0,1,2,3> + OP_VREV, + OP_VDUP0, + OP_VDUP1, + OP_VDUP2, + OP_VDUP3, + OP_VEXT1, + OP_VEXT2, + OP_VEXT3, + OP_VUZPL, // VUZP, left result + OP_VUZPR, // VUZP, right result + OP_VZIPL, // VZIP, left result + OP_VZIPR, // VZIP, right result + OP_VTRNL, // VTRN, left result + OP_VTRNR // VTRN, right result + }; + + if (OpNum == OP_COPY) { + if (LHSID == (1*9+2)*9+3) return LHS; + assert(LHSID == ((4*9+5)*9+6)*9+7 && "Illegal OP_COPY!"); + return RHS; + } + + SDValue OpLHS, OpRHS; + OpLHS = GeneratePerfectShuffle(PerfectShuffleTable[LHSID], LHS, RHS, DAG, dl); + OpRHS = GeneratePerfectShuffle(PerfectShuffleTable[RHSID], LHS, RHS, DAG, dl); + EVT VT = OpLHS.getValueType(); + + switch (OpNum) { + default: llvm_unreachable("Unknown shuffle opcode!"); + case OP_VREV: + return DAG.getNode(ARMISD::VREV64, dl, VT, OpLHS); + case OP_VDUP0: + case OP_VDUP1: + case OP_VDUP2: + case OP_VDUP3: + return DAG.getNode(ARMISD::VDUPLANE, dl, VT, + OpLHS, DAG.getConstant(OpNum-OP_VDUP0, MVT::i32)); + case OP_VEXT1: + case OP_VEXT2: + case OP_VEXT3: + return DAG.getNode(ARMISD::VEXT, dl, VT, + OpLHS, OpRHS, + DAG.getConstant(OpNum-OP_VEXT1+1, MVT::i32)); + case OP_VUZPL: + case OP_VUZPR: + return DAG.getNode(ARMISD::VUZP, dl, DAG.getVTList(VT, VT), + OpLHS, OpRHS).getValue(OpNum-OP_VUZPL); + case OP_VZIPL: + case OP_VZIPR: + return DAG.getNode(ARMISD::VZIP, dl, DAG.getVTList(VT, VT), + OpLHS, OpRHS).getValue(OpNum-OP_VZIPL); + case OP_VTRNL: + case OP_VTRNR: + return DAG.getNode(ARMISD::VTRN, dl, DAG.getVTList(VT, VT), + OpLHS, OpRHS).getValue(OpNum-OP_VTRNL); + } +} + +static SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) { + SDValue V1 = Op.getOperand(0); + SDValue V2 = Op.getOperand(1); + DebugLoc dl = Op.getDebugLoc(); + EVT VT = Op.getValueType(); + ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(Op.getNode()); + SmallVector<int, 8> ShuffleMask; + + // Convert shuffles that are directly supported on NEON to target-specific + // DAG nodes, instead of keeping them as shuffles and matching them again + // during code selection. This is more efficient and avoids the possibility + // of inconsistencies between legalization and selection. + // FIXME: floating-point vectors should be canonicalized to integer vectors + // of the same time so that they get CSEd properly. + SVN->getMask(ShuffleMask); + + if (ShuffleVectorSDNode::isSplatMask(&ShuffleMask[0], VT)) { + int Lane = SVN->getSplatIndex(); + // If this is undef splat, generate it via "just" vdup, if possible. + if (Lane == -1) Lane = 0; + + if (Lane == 0 && V1.getOpcode() == ISD::SCALAR_TO_VECTOR) { + return DAG.getNode(ARMISD::VDUP, dl, VT, V1.getOperand(0)); + } + return DAG.getNode(ARMISD::VDUPLANE, dl, VT, V1, + DAG.getConstant(Lane, MVT::i32)); + } + + bool ReverseVEXT; + unsigned Imm; + if (isVEXTMask(ShuffleMask, VT, ReverseVEXT, Imm)) { + if (ReverseVEXT) + std::swap(V1, V2); + return DAG.getNode(ARMISD::VEXT, dl, VT, V1, V2, + DAG.getConstant(Imm, MVT::i32)); + } + + if (isVREVMask(ShuffleMask, VT, 64)) + return DAG.getNode(ARMISD::VREV64, dl, VT, V1); + if (isVREVMask(ShuffleMask, VT, 32)) + return DAG.getNode(ARMISD::VREV32, dl, VT, V1); + if (isVREVMask(ShuffleMask, VT, 16)) + return DAG.getNode(ARMISD::VREV16, dl, VT, V1); + + // Check for Neon shuffles that modify both input vectors in place. + // If both results are used, i.e., if there are two shuffles with the same + // source operands and with masks corresponding to both results of one of + // these operations, DAG memoization will ensure that a single node is + // used for both shuffles. + unsigned WhichResult; + if (isVTRNMask(ShuffleMask, VT, WhichResult)) + return DAG.getNode(ARMISD::VTRN, dl, DAG.getVTList(VT, VT), + V1, V2).getValue(WhichResult); + if (isVUZPMask(ShuffleMask, VT, WhichResult)) + return DAG.getNode(ARMISD::VUZP, dl, DAG.getVTList(VT, VT), + V1, V2).getValue(WhichResult); + if (isVZIPMask(ShuffleMask, VT, WhichResult)) + return DAG.getNode(ARMISD::VZIP, dl, DAG.getVTList(VT, VT), + V1, V2).getValue(WhichResult); + + if (isVTRN_v_undef_Mask(ShuffleMask, VT, WhichResult)) + return DAG.getNode(ARMISD::VTRN, dl, DAG.getVTList(VT, VT), + V1, V1).getValue(WhichResult); + if (isVUZP_v_undef_Mask(ShuffleMask, VT, WhichResult)) + return DAG.getNode(ARMISD::VUZP, dl, DAG.getVTList(VT, VT), + V1, V1).getValue(WhichResult); + if (isVZIP_v_undef_Mask(ShuffleMask, VT, WhichResult)) + return DAG.getNode(ARMISD::VZIP, dl, DAG.getVTList(VT, VT), + V1, V1).getValue(WhichResult); + + // If the shuffle is not directly supported and it has 4 elements, use + // the PerfectShuffle-generated table to synthesize it from other shuffles. + unsigned NumElts = VT.getVectorNumElements(); + if (NumElts == 4) { + unsigned PFIndexes[4]; + for (unsigned i = 0; i != 4; ++i) { + if (ShuffleMask[i] < 0) + PFIndexes[i] = 8; + else + PFIndexes[i] = ShuffleMask[i]; + } + + // Compute the index in the perfect shuffle table. + unsigned PFTableIndex = + PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3]; + unsigned PFEntry = PerfectShuffleTable[PFTableIndex]; + unsigned Cost = (PFEntry >> 30); + + if (Cost <= 4) + return GeneratePerfectShuffle(PFEntry, V1, V2, DAG, dl); + } + + // Implement shuffles with 32- or 64-bit elements as subreg copies. + unsigned EltSize = VT.getVectorElementType().getSizeInBits(); + if (EltSize >= 32) { + // Do the expansion with floating-point types, since that is what the VFP + // registers are defined to use, and since i64 is not legal. + EVT EltVT = EVT::getFloatingPointVT(EltSize); + EVT VecVT = EVT::getVectorVT(*DAG.getContext(), EltVT, NumElts); + V1 = DAG.getNode(ISD::BIT_CONVERT, dl, VecVT, V1); + V2 = DAG.getNode(ISD::BIT_CONVERT, dl, VecVT, V2); + SDValue Val = DAG.getUNDEF(VecVT); + for (unsigned i = 0; i < NumElts; ++i) { + if (ShuffleMask[i] < 0) + continue; + SDValue Elt = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, EltVT, + ShuffleMask[i] < (int)NumElts ? V1 : V2, + DAG.getConstant(ShuffleMask[i] & (NumElts-1), + MVT::i32)); + Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VecVT, Val, + Elt, DAG.getConstant(i, MVT::i32)); + } + return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Val); + } + + return SDValue(); +} + +static SDValue LowerEXTRACT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) { + EVT VT = Op.getValueType(); + DebugLoc dl = Op.getDebugLoc(); + SDValue Vec = Op.getOperand(0); + SDValue Lane = Op.getOperand(1); + assert(VT == MVT::i32 && + Vec.getValueType().getVectorElementType().getSizeInBits() < 32 && + "unexpected type for custom-lowering vector extract"); + return DAG.getNode(ARMISD::VGETLANEu, dl, MVT::i32, Vec, Lane); +} + +static SDValue LowerCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) { + // The only time a CONCAT_VECTORS operation can have legal types is when + // two 64-bit vectors are concatenated to a 128-bit vector. + assert(Op.getValueType().is128BitVector() && Op.getNumOperands() == 2 && + "unexpected CONCAT_VECTORS"); + DebugLoc dl = Op.getDebugLoc(); + SDValue Val = DAG.getUNDEF(MVT::v2f64); + SDValue Op0 = Op.getOperand(0); + SDValue Op1 = Op.getOperand(1); + if (Op0.getOpcode() != ISD::UNDEF) + Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Val, + DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, Op0), + DAG.getIntPtrConstant(0)); + if (Op1.getOpcode() != ISD::UNDEF) + Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Val, + DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, Op1), + DAG.getIntPtrConstant(1)); + return DAG.getNode(ISD::BIT_CONVERT, dl, Op.getValueType(), Val); +} + +SDValue ARMTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const { + switch (Op.getOpcode()) { + default: llvm_unreachable("Don't know how to custom lower this!"); + case ISD::ConstantPool: return LowerConstantPool(Op, DAG); + case ISD::BlockAddress: return LowerBlockAddress(Op, DAG); + case ISD::GlobalAddress: + return Subtarget->isTargetDarwin() ? LowerGlobalAddressDarwin(Op, DAG) : + LowerGlobalAddressELF(Op, DAG); + case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG); + case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG); + case ISD::BR_CC: return LowerBR_CC(Op, DAG); + case ISD::BR_JT: return LowerBR_JT(Op, DAG); + case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG); + case ISD::VASTART: return LowerVASTART(Op, DAG); + case ISD::MEMBARRIER: return LowerMEMBARRIER(Op, DAG, Subtarget); + case ISD::SINT_TO_FP: + case ISD::UINT_TO_FP: return LowerINT_TO_FP(Op, DAG); + case ISD::FP_TO_SINT: + case ISD::FP_TO_UINT: return LowerFP_TO_INT(Op, DAG); + case ISD::FCOPYSIGN: return LowerFCOPYSIGN(Op, DAG); + case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG); + case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG); + case ISD::GLOBAL_OFFSET_TABLE: return LowerGLOBAL_OFFSET_TABLE(Op, DAG); + case ISD::EH_SJLJ_SETJMP: return LowerEH_SJLJ_SETJMP(Op, DAG); + case ISD::EH_SJLJ_LONGJMP: return LowerEH_SJLJ_LONGJMP(Op, DAG); + case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG, + Subtarget); + case ISD::BIT_CONVERT: return ExpandBIT_CONVERT(Op.getNode(), DAG); + case ISD::SHL: + case ISD::SRL: + case ISD::SRA: return LowerShift(Op.getNode(), DAG, Subtarget); + case ISD::SHL_PARTS: return LowerShiftLeftParts(Op, DAG); + case ISD::SRL_PARTS: + case ISD::SRA_PARTS: return LowerShiftRightParts(Op, DAG); + case ISD::CTTZ: return LowerCTTZ(Op.getNode(), DAG, Subtarget); + case ISD::VSETCC: return LowerVSETCC(Op, DAG); + case ISD::BUILD_VECTOR: return LowerBUILD_VECTOR(Op, DAG); + case ISD::VECTOR_SHUFFLE: return LowerVECTOR_SHUFFLE(Op, DAG); + case ISD::EXTRACT_VECTOR_ELT: return LowerEXTRACT_VECTOR_ELT(Op, DAG); + case ISD::CONCAT_VECTORS: return LowerCONCAT_VECTORS(Op, DAG); + } + return SDValue(); +} + +/// ReplaceNodeResults - Replace the results of node with an illegal result +/// type with new values built out of custom code. +void ARMTargetLowering::ReplaceNodeResults(SDNode *N, + SmallVectorImpl<SDValue>&Results, + SelectionDAG &DAG) const { + SDValue Res; + switch (N->getOpcode()) { + default: + llvm_unreachable("Don't know how to custom expand this!"); + break; + case ISD::BIT_CONVERT: + Res = ExpandBIT_CONVERT(N, DAG); + break; + case ISD::SRL: + case ISD::SRA: + Res = LowerShift(N, DAG, Subtarget); + break; + } + if (Res.getNode()) + Results.push_back(Res); +} + +//===----------------------------------------------------------------------===// +// ARM Scheduler Hooks +//===----------------------------------------------------------------------===// + +MachineBasicBlock * +ARMTargetLowering::EmitAtomicCmpSwap(MachineInstr *MI, + MachineBasicBlock *BB, + unsigned Size) const { + unsigned dest = MI->getOperand(0).getReg(); + unsigned ptr = MI->getOperand(1).getReg(); + unsigned oldval = MI->getOperand(2).getReg(); + unsigned newval = MI->getOperand(3).getReg(); + unsigned scratch = BB->getParent()->getRegInfo() + .createVirtualRegister(ARM::GPRRegisterClass); + const TargetInstrInfo *TII = getTargetMachine().getInstrInfo(); + DebugLoc dl = MI->getDebugLoc(); + bool isThumb2 = Subtarget->isThumb2(); + + unsigned ldrOpc, strOpc; + switch (Size) { + default: llvm_unreachable("unsupported size for AtomicCmpSwap!"); + case 1: + ldrOpc = isThumb2 ? ARM::t2LDREXB : ARM::LDREXB; + strOpc = isThumb2 ? ARM::t2LDREXB : ARM::STREXB; + break; + case 2: + ldrOpc = isThumb2 ? ARM::t2LDREXH : ARM::LDREXH; + strOpc = isThumb2 ? ARM::t2STREXH : ARM::STREXH; + break; + case 4: + ldrOpc = isThumb2 ? ARM::t2LDREX : ARM::LDREX; + strOpc = isThumb2 ? ARM::t2STREX : ARM::STREX; + break; + } + + MachineFunction *MF = BB->getParent(); + const BasicBlock *LLVM_BB = BB->getBasicBlock(); + MachineFunction::iterator It = BB; + ++It; // insert the new blocks after the current block + + MachineBasicBlock *loop1MBB = MF->CreateMachineBasicBlock(LLVM_BB); + MachineBasicBlock *loop2MBB = MF->CreateMachineBasicBlock(LLVM_BB); + MachineBasicBlock *exitMBB = MF->CreateMachineBasicBlock(LLVM_BB); + MF->insert(It, loop1MBB); + MF->insert(It, loop2MBB); + MF->insert(It, exitMBB); + exitMBB->transferSuccessors(BB); + + // thisMBB: + // ... + // fallthrough --> loop1MBB + BB->addSuccessor(loop1MBB); + + // loop1MBB: + // ldrex dest, [ptr] + // cmp dest, oldval + // bne exitMBB + BB = loop1MBB; + AddDefaultPred(BuildMI(BB, dl, TII->get(ldrOpc), dest).addReg(ptr)); + AddDefaultPred(BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2CMPrr : ARM::CMPrr)) + .addReg(dest).addReg(oldval)); + BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2Bcc : ARM::Bcc)) + .addMBB(exitMBB).addImm(ARMCC::NE).addReg(ARM::CPSR); + BB->addSuccessor(loop2MBB); + BB->addSuccessor(exitMBB); + + // loop2MBB: + // strex scratch, newval, [ptr] + // cmp scratch, #0 + // bne loop1MBB + BB = loop2MBB; + AddDefaultPred(BuildMI(BB, dl, TII->get(strOpc), scratch).addReg(newval) + .addReg(ptr)); + AddDefaultPred(BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2CMPri : ARM::CMPri)) + .addReg(scratch).addImm(0)); + BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2Bcc : ARM::Bcc)) + .addMBB(loop1MBB).addImm(ARMCC::NE).addReg(ARM::CPSR); + BB->addSuccessor(loop1MBB); + BB->addSuccessor(exitMBB); + + // exitMBB: + // ... + BB = exitMBB; + + MF->DeleteMachineInstr(MI); // The instruction is gone now. + + return BB; +} + +MachineBasicBlock * +ARMTargetLowering::EmitAtomicBinary(MachineInstr *MI, MachineBasicBlock *BB, + unsigned Size, unsigned BinOpcode) const { + // This also handles ATOMIC_SWAP, indicated by BinOpcode==0. + const TargetInstrInfo *TII = getTargetMachine().getInstrInfo(); + + const BasicBlock *LLVM_BB = BB->getBasicBlock(); + MachineFunction *MF = BB->getParent(); + MachineFunction::iterator It = BB; + ++It; + + unsigned dest = MI->getOperand(0).getReg(); + unsigned ptr = MI->getOperand(1).getReg(); + unsigned incr = MI->getOperand(2).getReg(); + DebugLoc dl = MI->getDebugLoc(); + + bool isThumb2 = Subtarget->isThumb2(); + unsigned ldrOpc, strOpc; + switch (Size) { + default: llvm_unreachable("unsupported size for AtomicCmpSwap!"); + case 1: + ldrOpc = isThumb2 ? ARM::t2LDREXB : ARM::LDREXB; + strOpc = isThumb2 ? ARM::t2STREXB : ARM::STREXB; + break; + case 2: + ldrOpc = isThumb2 ? ARM::t2LDREXH : ARM::LDREXH; + strOpc = isThumb2 ? ARM::t2STREXH : ARM::STREXH; + break; + case 4: + ldrOpc = isThumb2 ? ARM::t2LDREX : ARM::LDREX; + strOpc = isThumb2 ? ARM::t2STREX : ARM::STREX; + break; + } + + MachineBasicBlock *loopMBB = MF->CreateMachineBasicBlock(LLVM_BB); + MachineBasicBlock *exitMBB = MF->CreateMachineBasicBlock(LLVM_BB); + MF->insert(It, loopMBB); + MF->insert(It, exitMBB); + exitMBB->transferSuccessors(BB); + + MachineRegisterInfo &RegInfo = MF->getRegInfo(); + unsigned scratch = RegInfo.createVirtualRegister(ARM::GPRRegisterClass); + unsigned scratch2 = (!BinOpcode) ? incr : + RegInfo.createVirtualRegister(ARM::GPRRegisterClass); + + // thisMBB: + // ... + // fallthrough --> loopMBB + BB->addSuccessor(loopMBB); + + // loopMBB: + // ldrex dest, ptr + // <binop> scratch2, dest, incr + // strex scratch, scratch2, ptr + // cmp scratch, #0 + // bne- loopMBB + // fallthrough --> exitMBB + BB = loopMBB; + AddDefaultPred(BuildMI(BB, dl, TII->get(ldrOpc), dest).addReg(ptr)); + if (BinOpcode) { + // operand order needs to go the other way for NAND + if (BinOpcode == ARM::BICrr || BinOpcode == ARM::t2BICrr) + AddDefaultPred(BuildMI(BB, dl, TII->get(BinOpcode), scratch2). + addReg(incr).addReg(dest)).addReg(0); + else + AddDefaultPred(BuildMI(BB, dl, TII->get(BinOpcode), scratch2). + addReg(dest).addReg(incr)).addReg(0); + } + + AddDefaultPred(BuildMI(BB, dl, TII->get(strOpc), scratch).addReg(scratch2) + .addReg(ptr)); + AddDefaultPred(BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2CMPri : ARM::CMPri)) + .addReg(scratch).addImm(0)); + BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2Bcc : ARM::Bcc)) + .addMBB(loopMBB).addImm(ARMCC::NE).addReg(ARM::CPSR); + + BB->addSuccessor(loopMBB); + BB->addSuccessor(exitMBB); + + // exitMBB: + // ... + BB = exitMBB; + + MF->DeleteMachineInstr(MI); // The instruction is gone now. + + return BB; +} + +MachineBasicBlock * +ARMTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI, + MachineBasicBlock *BB) const { + const TargetInstrInfo *TII = getTargetMachine().getInstrInfo(); + DebugLoc dl = MI->getDebugLoc(); + bool isThumb2 = Subtarget->isThumb2(); + switch (MI->getOpcode()) { + default: + MI->dump(); + llvm_unreachable("Unexpected instr type to insert"); + + case ARM::ATOMIC_LOAD_ADD_I8: + return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2ADDrr : ARM::ADDrr); + case ARM::ATOMIC_LOAD_ADD_I16: + return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2ADDrr : ARM::ADDrr); + case ARM::ATOMIC_LOAD_ADD_I32: + return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2ADDrr : ARM::ADDrr); + + case ARM::ATOMIC_LOAD_AND_I8: + return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2ANDrr : ARM::ANDrr); + case ARM::ATOMIC_LOAD_AND_I16: + return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2ANDrr : ARM::ANDrr); + case ARM::ATOMIC_LOAD_AND_I32: + return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2ANDrr : ARM::ANDrr); + + case ARM::ATOMIC_LOAD_OR_I8: + return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2ORRrr : ARM::ORRrr); + case ARM::ATOMIC_LOAD_OR_I16: + return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2ORRrr : ARM::ORRrr); + case ARM::ATOMIC_LOAD_OR_I32: + return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2ORRrr : ARM::ORRrr); + + case ARM::ATOMIC_LOAD_XOR_I8: + return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2EORrr : ARM::EORrr); + case ARM::ATOMIC_LOAD_XOR_I16: + return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2EORrr : ARM::EORrr); + case ARM::ATOMIC_LOAD_XOR_I32: + return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2EORrr : ARM::EORrr); + + case ARM::ATOMIC_LOAD_NAND_I8: + return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2BICrr : ARM::BICrr); + case ARM::ATOMIC_LOAD_NAND_I16: + return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2BICrr : ARM::BICrr); + case ARM::ATOMIC_LOAD_NAND_I32: + return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2BICrr : ARM::BICrr); + + case ARM::ATOMIC_LOAD_SUB_I8: + return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2SUBrr : ARM::SUBrr); + case ARM::ATOMIC_LOAD_SUB_I16: + return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2SUBrr : ARM::SUBrr); + case ARM::ATOMIC_LOAD_SUB_I32: + return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2SUBrr : ARM::SUBrr); + + case ARM::ATOMIC_SWAP_I8: return EmitAtomicBinary(MI, BB, 1, 0); + case ARM::ATOMIC_SWAP_I16: return EmitAtomicBinary(MI, BB, 2, 0); + case ARM::ATOMIC_SWAP_I32: return EmitAtomicBinary(MI, BB, 4, 0); + + case ARM::ATOMIC_CMP_SWAP_I8: return EmitAtomicCmpSwap(MI, BB, 1); + case ARM::ATOMIC_CMP_SWAP_I16: return EmitAtomicCmpSwap(MI, BB, 2); + case ARM::ATOMIC_CMP_SWAP_I32: return EmitAtomicCmpSwap(MI, BB, 4); + + case ARM::tMOVCCr_pseudo: { + // To "insert" a SELECT_CC instruction, we actually have to insert the + // diamond control-flow pattern. The incoming instruction knows the + // destination vreg to set, the condition code register to branch on, the + // true/false values to select between, and a branch opcode to use. + const BasicBlock *LLVM_BB = BB->getBasicBlock(); + MachineFunction::iterator It = BB; + ++It; + + // thisMBB: + // ... + // TrueVal = ... + // cmpTY ccX, r1, r2 + // bCC copy1MBB + // fallthrough --> copy0MBB + MachineBasicBlock *thisMBB = BB; + MachineFunction *F = BB->getParent(); + MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB); + MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB); + BuildMI(BB, dl, TII->get(ARM::tBcc)).addMBB(sinkMBB) + .addImm(MI->getOperand(3).getImm()).addReg(MI->getOperand(4).getReg()); + F->insert(It, copy0MBB); + F->insert(It, sinkMBB); + // Update machine-CFG edges by first adding all successors of the current + // block to the new block which will contain the Phi node for the select. + for (MachineBasicBlock::succ_iterator I = BB->succ_begin(), + E = BB->succ_end(); I != E; ++I) + sinkMBB->addSuccessor(*I); + // Next, remove all successors of the current block, and add the true + // and fallthrough blocks as its successors. + while (!BB->succ_empty()) + BB->removeSuccessor(BB->succ_begin()); + BB->addSuccessor(copy0MBB); + BB->addSuccessor(sinkMBB); + + // copy0MBB: + // %FalseValue = ... + // # fallthrough to sinkMBB + BB = copy0MBB; + + // Update machine-CFG edges + BB->addSuccessor(sinkMBB); + + // sinkMBB: + // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ] + // ... + BB = sinkMBB; + BuildMI(BB, dl, TII->get(ARM::PHI), MI->getOperand(0).getReg()) + .addReg(MI->getOperand(1).getReg()).addMBB(copy0MBB) + .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB); + + F->DeleteMachineInstr(MI); // The pseudo instruction is gone now. + return BB; + } + + case ARM::tANDsp: + case ARM::tADDspr_: + case ARM::tSUBspi_: + case ARM::t2SUBrSPi_: + case ARM::t2SUBrSPi12_: + case ARM::t2SUBrSPs_: { + MachineFunction *MF = BB->getParent(); + unsigned DstReg = MI->getOperand(0).getReg(); + unsigned SrcReg = MI->getOperand(1).getReg(); + bool DstIsDead = MI->getOperand(0).isDead(); + bool SrcIsKill = MI->getOperand(1).isKill(); + + if (SrcReg != ARM::SP) { + // Copy the source to SP from virtual register. + const TargetRegisterClass *RC = MF->getRegInfo().getRegClass(SrcReg); + unsigned CopyOpc = (RC == ARM::tGPRRegisterClass) + ? ARM::tMOVtgpr2gpr : ARM::tMOVgpr2gpr; + BuildMI(BB, dl, TII->get(CopyOpc), ARM::SP) + .addReg(SrcReg, getKillRegState(SrcIsKill)); + } + + unsigned OpOpc = 0; + bool NeedPred = false, NeedCC = false, NeedOp3 = false; + switch (MI->getOpcode()) { + default: + llvm_unreachable("Unexpected pseudo instruction!"); + case ARM::tANDsp: + OpOpc = ARM::tAND; + NeedPred = true; + break; + case ARM::tADDspr_: + OpOpc = ARM::tADDspr; + break; + case ARM::tSUBspi_: + OpOpc = ARM::tSUBspi; + break; + case ARM::t2SUBrSPi_: + OpOpc = ARM::t2SUBrSPi; + NeedPred = true; NeedCC = true; + break; + case ARM::t2SUBrSPi12_: + OpOpc = ARM::t2SUBrSPi12; + NeedPred = true; + break; + case ARM::t2SUBrSPs_: + OpOpc = ARM::t2SUBrSPs; + NeedPred = true; NeedCC = true; NeedOp3 = true; + break; + } + MachineInstrBuilder MIB = BuildMI(BB, dl, TII->get(OpOpc), ARM::SP); + if (OpOpc == ARM::tAND) + AddDefaultT1CC(MIB); + MIB.addReg(ARM::SP); + MIB.addOperand(MI->getOperand(2)); + if (NeedOp3) + MIB.addOperand(MI->getOperand(3)); + if (NeedPred) + AddDefaultPred(MIB); + if (NeedCC) + AddDefaultCC(MIB); + + // Copy the result from SP to virtual register. + const TargetRegisterClass *RC = MF->getRegInfo().getRegClass(DstReg); + unsigned CopyOpc = (RC == ARM::tGPRRegisterClass) + ? ARM::tMOVgpr2tgpr : ARM::tMOVgpr2gpr; + BuildMI(BB, dl, TII->get(CopyOpc)) + .addReg(DstReg, getDefRegState(true) | getDeadRegState(DstIsDead)) + .addReg(ARM::SP); + MF->DeleteMachineInstr(MI); // The pseudo instruction is gone now. + return BB; + } + } +} + +//===----------------------------------------------------------------------===// +// ARM Optimization Hooks +//===----------------------------------------------------------------------===// + +static +SDValue combineSelectAndUse(SDNode *N, SDValue Slct, SDValue OtherOp, + TargetLowering::DAGCombinerInfo &DCI) { + SelectionDAG &DAG = DCI.DAG; + const TargetLowering &TLI = DAG.getTargetLoweringInfo(); + EVT VT = N->getValueType(0); + unsigned Opc = N->getOpcode(); + bool isSlctCC = Slct.getOpcode() == ISD::SELECT_CC; + SDValue LHS = isSlctCC ? Slct.getOperand(2) : Slct.getOperand(1); + SDValue RHS = isSlctCC ? Slct.getOperand(3) : Slct.getOperand(2); + ISD::CondCode CC = ISD::SETCC_INVALID; + + if (isSlctCC) { + CC = cast<CondCodeSDNode>(Slct.getOperand(4))->get(); + } else { + SDValue CCOp = Slct.getOperand(0); + if (CCOp.getOpcode() == ISD::SETCC) + CC = cast<CondCodeSDNode>(CCOp.getOperand(2))->get(); + } + + bool DoXform = false; + bool InvCC = false; + assert ((Opc == ISD::ADD || (Opc == ISD::SUB && Slct == N->getOperand(1))) && + "Bad input!"); + + if (LHS.getOpcode() == ISD::Constant && + cast<ConstantSDNode>(LHS)->isNullValue()) { + DoXform = true; + } else if (CC != ISD::SETCC_INVALID && + RHS.getOpcode() == ISD::Constant && + cast<ConstantSDNode>(RHS)->isNullValue()) { + std::swap(LHS, RHS); + SDValue Op0 = Slct.getOperand(0); + EVT OpVT = isSlctCC ? Op0.getValueType() : + Op0.getOperand(0).getValueType(); + bool isInt = OpVT.isInteger(); + CC = ISD::getSetCCInverse(CC, isInt); + + if (!TLI.isCondCodeLegal(CC, OpVT)) + return SDValue(); // Inverse operator isn't legal. + + DoXform = true; + InvCC = true; + } + + if (DoXform) { + SDValue Result = DAG.getNode(Opc, RHS.getDebugLoc(), VT, OtherOp, RHS); + if (isSlctCC) + return DAG.getSelectCC(N->getDebugLoc(), OtherOp, Result, + Slct.getOperand(0), Slct.getOperand(1), CC); + SDValue CCOp = Slct.getOperand(0); + if (InvCC) + CCOp = DAG.getSetCC(Slct.getDebugLoc(), CCOp.getValueType(), + CCOp.getOperand(0), CCOp.getOperand(1), CC); + return DAG.getNode(ISD::SELECT, N->getDebugLoc(), VT, + CCOp, OtherOp, Result); + } + return SDValue(); +} + +/// PerformADDCombine - Target-specific dag combine xforms for ISD::ADD. +static SDValue PerformADDCombine(SDNode *N, + TargetLowering::DAGCombinerInfo &DCI) { + // added by evan in r37685 with no testcase. + SDValue N0 = N->getOperand(0), N1 = N->getOperand(1); + + // fold (add (select cc, 0, c), x) -> (select cc, x, (add, x, c)) + if (N0.getOpcode() == ISD::SELECT && N0.getNode()->hasOneUse()) { + SDValue Result = combineSelectAndUse(N, N0, N1, DCI); + if (Result.getNode()) return Result; + } + if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) { + SDValue Result = combineSelectAndUse(N, N1, N0, DCI); + if (Result.getNode()) return Result; + } + + return SDValue(); +} + +/// PerformSUBCombine - Target-specific dag combine xforms for ISD::SUB. +static SDValue PerformSUBCombine(SDNode *N, + TargetLowering::DAGCombinerInfo &DCI) { + // added by evan in r37685 with no testcase. + SDValue N0 = N->getOperand(0), N1 = N->getOperand(1); + + // fold (sub x, (select cc, 0, c)) -> (select cc, x, (sub, x, c)) + if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) { + SDValue Result = combineSelectAndUse(N, N1, N0, DCI); + if (Result.getNode()) return Result; + } + + return SDValue(); +} + +static SDValue PerformMULCombine(SDNode *N, + TargetLowering::DAGCombinerInfo &DCI, + const ARMSubtarget *Subtarget) { + SelectionDAG &DAG = DCI.DAG; + + if (Subtarget->isThumb1Only()) + return SDValue(); + + if (DAG.getMachineFunction(). + getFunction()->hasFnAttr(Attribute::OptimizeForSize)) + return SDValue(); + + if (DCI.isBeforeLegalize() || DCI.isCalledByLegalizer()) + return SDValue(); + + EVT VT = N->getValueType(0); + if (VT != MVT::i32) + return SDValue(); + + ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(1)); + if (!C) + return SDValue(); + + uint64_t MulAmt = C->getZExtValue(); + unsigned ShiftAmt = CountTrailingZeros_64(MulAmt); + ShiftAmt = ShiftAmt & (32 - 1); + SDValue V = N->getOperand(0); + DebugLoc DL = N->getDebugLoc(); + + SDValue Res; + MulAmt >>= ShiftAmt; + if (isPowerOf2_32(MulAmt - 1)) { + // (mul x, 2^N + 1) => (add (shl x, N), x) + Res = DAG.getNode(ISD::ADD, DL, VT, + V, DAG.getNode(ISD::SHL, DL, VT, + V, DAG.getConstant(Log2_32(MulAmt-1), + MVT::i32))); + } else if (isPowerOf2_32(MulAmt + 1)) { + // (mul x, 2^N - 1) => (sub (shl x, N), x) + Res = DAG.getNode(ISD::SUB, DL, VT, + DAG.getNode(ISD::SHL, DL, VT, + V, DAG.getConstant(Log2_32(MulAmt+1), + MVT::i32)), + V); + } else + return SDValue(); + + if (ShiftAmt != 0) + Res = DAG.getNode(ISD::SHL, DL, VT, Res, + DAG.getConstant(ShiftAmt, MVT::i32)); + + // Do not add new nodes to DAG combiner worklist. + DCI.CombineTo(N, Res, false); + return SDValue(); +} + +/// PerformVMOVRRDCombine - Target-specific dag combine xforms for +/// ARMISD::VMOVRRD. +static SDValue PerformVMOVRRDCombine(SDNode *N, + TargetLowering::DAGCombinerInfo &DCI) { + // fmrrd(fmdrr x, y) -> x,y + SDValue InDouble = N->getOperand(0); + if (InDouble.getOpcode() == ARMISD::VMOVDRR) + return DCI.CombineTo(N, InDouble.getOperand(0), InDouble.getOperand(1)); + return SDValue(); +} + +/// getVShiftImm - Check if this is a valid build_vector for the immediate +/// operand of a vector shift operation, where all the elements of the +/// build_vector must have the same constant integer value. +static bool getVShiftImm(SDValue Op, unsigned ElementBits, int64_t &Cnt) { + // Ignore bit_converts. + while (Op.getOpcode() == ISD::BIT_CONVERT) + Op = Op.getOperand(0); + BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(Op.getNode()); + APInt SplatBits, SplatUndef; + unsigned SplatBitSize; + bool HasAnyUndefs; + if (! BVN || ! BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize, + HasAnyUndefs, ElementBits) || + SplatBitSize > ElementBits) + return false; + Cnt = SplatBits.getSExtValue(); + return true; +} + +/// isVShiftLImm - Check if this is a valid build_vector for the immediate +/// operand of a vector shift left operation. That value must be in the range: +/// 0 <= Value < ElementBits for a left shift; or +/// 0 <= Value <= ElementBits for a long left shift. +static bool isVShiftLImm(SDValue Op, EVT VT, bool isLong, int64_t &Cnt) { + assert(VT.isVector() && "vector shift count is not a vector type"); + unsigned ElementBits = VT.getVectorElementType().getSizeInBits(); + if (! getVShiftImm(Op, ElementBits, Cnt)) + return false; + return (Cnt >= 0 && (isLong ? Cnt-1 : Cnt) < ElementBits); +} + +/// isVShiftRImm - Check if this is a valid build_vector for the immediate +/// operand of a vector shift right operation. For a shift opcode, the value +/// is positive, but for an intrinsic the value count must be negative. The +/// absolute value must be in the range: +/// 1 <= |Value| <= ElementBits for a right shift; or +/// 1 <= |Value| <= ElementBits/2 for a narrow right shift. +static bool isVShiftRImm(SDValue Op, EVT VT, bool isNarrow, bool isIntrinsic, + int64_t &Cnt) { + assert(VT.isVector() && "vector shift count is not a vector type"); + unsigned ElementBits = VT.getVectorElementType().getSizeInBits(); + if (! getVShiftImm(Op, ElementBits, Cnt)) + return false; + if (isIntrinsic) + Cnt = -Cnt; + return (Cnt >= 1 && Cnt <= (isNarrow ? ElementBits/2 : ElementBits)); +} + +/// PerformIntrinsicCombine - ARM-specific DAG combining for intrinsics. +static SDValue PerformIntrinsicCombine(SDNode *N, SelectionDAG &DAG) { + unsigned IntNo = cast<ConstantSDNode>(N->getOperand(0))->getZExtValue(); + switch (IntNo) { + default: + // Don't do anything for most intrinsics. + break; + + // Vector shifts: check for immediate versions and lower them. + // Note: This is done during DAG combining instead of DAG legalizing because + // the build_vectors for 64-bit vector element shift counts are generally + // not legal, and it is hard to see their values after they get legalized to + // loads from a constant pool. + case Intrinsic::arm_neon_vshifts: + case Intrinsic::arm_neon_vshiftu: + case Intrinsic::arm_neon_vshiftls: + case Intrinsic::arm_neon_vshiftlu: + case Intrinsic::arm_neon_vshiftn: + case Intrinsic::arm_neon_vrshifts: + case Intrinsic::arm_neon_vrshiftu: + case Intrinsic::arm_neon_vrshiftn: + case Intrinsic::arm_neon_vqshifts: + case Intrinsic::arm_neon_vqshiftu: + case Intrinsic::arm_neon_vqshiftsu: + case Intrinsic::arm_neon_vqshiftns: + case Intrinsic::arm_neon_vqshiftnu: + case Intrinsic::arm_neon_vqshiftnsu: + case Intrinsic::arm_neon_vqrshiftns: + case Intrinsic::arm_neon_vqrshiftnu: + case Intrinsic::arm_neon_vqrshiftnsu: { + EVT VT = N->getOperand(1).getValueType(); + int64_t Cnt; + unsigned VShiftOpc = 0; + + switch (IntNo) { + case Intrinsic::arm_neon_vshifts: + case Intrinsic::arm_neon_vshiftu: + if (isVShiftLImm(N->getOperand(2), VT, false, Cnt)) { + VShiftOpc = ARMISD::VSHL; + break; + } + if (isVShiftRImm(N->getOperand(2), VT, false, true, Cnt)) { + VShiftOpc = (IntNo == Intrinsic::arm_neon_vshifts ? + ARMISD::VSHRs : ARMISD::VSHRu); + break; + } + return SDValue(); + + case Intrinsic::arm_neon_vshiftls: + case Intrinsic::arm_neon_vshiftlu: + if (isVShiftLImm(N->getOperand(2), VT, true, Cnt)) + break; + llvm_unreachable("invalid shift count for vshll intrinsic"); + + case Intrinsic::arm_neon_vrshifts: + case Intrinsic::arm_neon_vrshiftu: + if (isVShiftRImm(N->getOperand(2), VT, false, true, Cnt)) + break; + return SDValue(); + + case Intrinsic::arm_neon_vqshifts: + case Intrinsic::arm_neon_vqshiftu: + if (isVShiftLImm(N->getOperand(2), VT, false, Cnt)) + break; + return SDValue(); + + case Intrinsic::arm_neon_vqshiftsu: + if (isVShiftLImm(N->getOperand(2), VT, false, Cnt)) + break; + llvm_unreachable("invalid shift count for vqshlu intrinsic"); + + case Intrinsic::arm_neon_vshiftn: + case Intrinsic::arm_neon_vrshiftn: + case Intrinsic::arm_neon_vqshiftns: + case Intrinsic::arm_neon_vqshiftnu: + case Intrinsic::arm_neon_vqshiftnsu: + case Intrinsic::arm_neon_vqrshiftns: + case Intrinsic::arm_neon_vqrshiftnu: + case Intrinsic::arm_neon_vqrshiftnsu: + // Narrowing shifts require an immediate right shift. + if (isVShiftRImm(N->getOperand(2), VT, true, true, Cnt)) + break; + llvm_unreachable("invalid shift count for narrowing vector shift intrinsic"); + + default: + llvm_unreachable("unhandled vector shift"); + } + + switch (IntNo) { + case Intrinsic::arm_neon_vshifts: + case Intrinsic::arm_neon_vshiftu: + // Opcode already set above. + break; + case Intrinsic::arm_neon_vshiftls: + case Intrinsic::arm_neon_vshiftlu: + if (Cnt == VT.getVectorElementType().getSizeInBits()) + VShiftOpc = ARMISD::VSHLLi; + else + VShiftOpc = (IntNo == Intrinsic::arm_neon_vshiftls ? + ARMISD::VSHLLs : ARMISD::VSHLLu); + break; + case Intrinsic::arm_neon_vshiftn: + VShiftOpc = ARMISD::VSHRN; break; + case Intrinsic::arm_neon_vrshifts: + VShiftOpc = ARMISD::VRSHRs; break; + case Intrinsic::arm_neon_vrshiftu: + VShiftOpc = ARMISD::VRSHRu; break; + case Intrinsic::arm_neon_vrshiftn: + VShiftOpc = ARMISD::VRSHRN; break; + case Intrinsic::arm_neon_vqshifts: + VShiftOpc = ARMISD::VQSHLs; break; + case Intrinsic::arm_neon_vqshiftu: + VShiftOpc = ARMISD::VQSHLu; break; + case Intrinsic::arm_neon_vqshiftsu: + VShiftOpc = ARMISD::VQSHLsu; break; + case Intrinsic::arm_neon_vqshiftns: + VShiftOpc = ARMISD::VQSHRNs; break; + case Intrinsic::arm_neon_vqshiftnu: + VShiftOpc = ARMISD::VQSHRNu; break; + case Intrinsic::arm_neon_vqshiftnsu: + VShiftOpc = ARMISD::VQSHRNsu; break; + case Intrinsic::arm_neon_vqrshiftns: + VShiftOpc = ARMISD::VQRSHRNs; break; + case Intrinsic::arm_neon_vqrshiftnu: + VShiftOpc = ARMISD::VQRSHRNu; break; + case Intrinsic::arm_neon_vqrshiftnsu: + VShiftOpc = ARMISD::VQRSHRNsu; break; + } + + return DAG.getNode(VShiftOpc, N->getDebugLoc(), N->getValueType(0), + N->getOperand(1), DAG.getConstant(Cnt, MVT::i32)); + } + + case Intrinsic::arm_neon_vshiftins: { + EVT VT = N->getOperand(1).getValueType(); + int64_t Cnt; + unsigned VShiftOpc = 0; + + if (isVShiftLImm(N->getOperand(3), VT, false, Cnt)) + VShiftOpc = ARMISD::VSLI; + else if (isVShiftRImm(N->getOperand(3), VT, false, true, Cnt)) + VShiftOpc = ARMISD::VSRI; + else { + llvm_unreachable("invalid shift count for vsli/vsri intrinsic"); + } + + return DAG.getNode(VShiftOpc, N->getDebugLoc(), N->getValueType(0), + N->getOperand(1), N->getOperand(2), + DAG.getConstant(Cnt, MVT::i32)); + } + + case Intrinsic::arm_neon_vqrshifts: + case Intrinsic::arm_neon_vqrshiftu: + // No immediate versions of these to check for. + break; + } + + return SDValue(); +} + +/// PerformShiftCombine - Checks for immediate versions of vector shifts and +/// lowers them. As with the vector shift intrinsics, this is done during DAG +/// combining instead of DAG legalizing because the build_vectors for 64-bit +/// vector element shift counts are generally not legal, and it is hard to see +/// their values after they get legalized to loads from a constant pool. +static SDValue PerformShiftCombine(SDNode *N, SelectionDAG &DAG, + const ARMSubtarget *ST) { + EVT VT = N->getValueType(0); + + // Nothing to be done for scalar shifts. + if (! VT.isVector()) + return SDValue(); + + assert(ST->hasNEON() && "unexpected vector shift"); + int64_t Cnt; + + switch (N->getOpcode()) { + default: llvm_unreachable("unexpected shift opcode"); + + case ISD::SHL: + if (isVShiftLImm(N->getOperand(1), VT, false, Cnt)) + return DAG.getNode(ARMISD::VSHL, N->getDebugLoc(), VT, N->getOperand(0), + DAG.getConstant(Cnt, MVT::i32)); + break; + + case ISD::SRA: + case ISD::SRL: + if (isVShiftRImm(N->getOperand(1), VT, false, false, Cnt)) { + unsigned VShiftOpc = (N->getOpcode() == ISD::SRA ? + ARMISD::VSHRs : ARMISD::VSHRu); + return DAG.getNode(VShiftOpc, N->getDebugLoc(), VT, N->getOperand(0), + DAG.getConstant(Cnt, MVT::i32)); + } + } + return SDValue(); +} + +/// PerformExtendCombine - Target-specific DAG combining for ISD::SIGN_EXTEND, +/// ISD::ZERO_EXTEND, and ISD::ANY_EXTEND. +static SDValue PerformExtendCombine(SDNode *N, SelectionDAG &DAG, + const ARMSubtarget *ST) { + SDValue N0 = N->getOperand(0); + + // Check for sign- and zero-extensions of vector extract operations of 8- + // and 16-bit vector elements. NEON supports these directly. They are + // handled during DAG combining because type legalization will promote them + // to 32-bit types and it is messy to recognize the operations after that. + if (ST->hasNEON() && N0.getOpcode() == ISD::EXTRACT_VECTOR_ELT) { + SDValue Vec = N0.getOperand(0); + SDValue Lane = N0.getOperand(1); + EVT VT = N->getValueType(0); + EVT EltVT = N0.getValueType(); + const TargetLowering &TLI = DAG.getTargetLoweringInfo(); + + if (VT == MVT::i32 && + (EltVT == MVT::i8 || EltVT == MVT::i16) && + TLI.isTypeLegal(Vec.getValueType())) { + + unsigned Opc = 0; + switch (N->getOpcode()) { + default: llvm_unreachable("unexpected opcode"); + case ISD::SIGN_EXTEND: + Opc = ARMISD::VGETLANEs; + break; + case ISD::ZERO_EXTEND: + case ISD::ANY_EXTEND: + Opc = ARMISD::VGETLANEu; + break; + } + return DAG.getNode(Opc, N->getDebugLoc(), VT, Vec, Lane); + } + } + + return SDValue(); +} + +/// PerformSELECT_CCCombine - Target-specific DAG combining for ISD::SELECT_CC +/// to match f32 max/min patterns to use NEON vmax/vmin instructions. +static SDValue PerformSELECT_CCCombine(SDNode *N, SelectionDAG &DAG, + const ARMSubtarget *ST) { + // If the target supports NEON, try to use vmax/vmin instructions for f32 + // selects like "x < y ? x : y". Unless the FiniteOnlyFPMath option is set, + // be careful about NaNs: NEON's vmax/vmin return NaN if either operand is + // a NaN; only do the transformation when it matches that behavior. + + // For now only do this when using NEON for FP operations; if using VFP, it + // is not obvious that the benefit outweighs the cost of switching to the + // NEON pipeline. + if (!ST->hasNEON() || !ST->useNEONForSinglePrecisionFP() || + N->getValueType(0) != MVT::f32) + return SDValue(); + + SDValue CondLHS = N->getOperand(0); + SDValue CondRHS = N->getOperand(1); + SDValue LHS = N->getOperand(2); + SDValue RHS = N->getOperand(3); + ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(4))->get(); + + unsigned Opcode = 0; + bool IsReversed; + if (DAG.isEqualTo(LHS, CondLHS) && DAG.isEqualTo(RHS, CondRHS)) { + IsReversed = false; // x CC y ? x : y + } else if (DAG.isEqualTo(LHS, CondRHS) && DAG.isEqualTo(RHS, CondLHS)) { + IsReversed = true ; // x CC y ? y : x + } else { + return SDValue(); + } + + bool IsUnordered; + switch (CC) { + default: break; + case ISD::SETOLT: + case ISD::SETOLE: + case ISD::SETLT: + case ISD::SETLE: + case ISD::SETULT: + case ISD::SETULE: + // If LHS is NaN, an ordered comparison will be false and the result will + // be the RHS, but vmin(NaN, RHS) = NaN. Avoid this by checking that LHS + // != NaN. Likewise, for unordered comparisons, check for RHS != NaN. + IsUnordered = (CC == ISD::SETULT || CC == ISD::SETULE); + if (!DAG.isKnownNeverNaN(IsUnordered ? RHS : LHS)) + break; + // For less-than-or-equal comparisons, "+0 <= -0" will be true but vmin + // will return -0, so vmin can only be used for unsafe math or if one of + // the operands is known to be nonzero. + if ((CC == ISD::SETLE || CC == ISD::SETOLE || CC == ISD::SETULE) && + !UnsafeFPMath && + !(DAG.isKnownNeverZero(LHS) || DAG.isKnownNeverZero(RHS))) + break; + Opcode = IsReversed ? ARMISD::FMAX : ARMISD::FMIN; + break; + + case ISD::SETOGT: + case ISD::SETOGE: + case ISD::SETGT: + case ISD::SETGE: + case ISD::SETUGT: + case ISD::SETUGE: + // If LHS is NaN, an ordered comparison will be false and the result will + // be the RHS, but vmax(NaN, RHS) = NaN. Avoid this by checking that LHS + // != NaN. Likewise, for unordered comparisons, check for RHS != NaN. + IsUnordered = (CC == ISD::SETUGT || CC == ISD::SETUGE); + if (!DAG.isKnownNeverNaN(IsUnordered ? RHS : LHS)) + break; + // For greater-than-or-equal comparisons, "-0 >= +0" will be true but vmax + // will return +0, so vmax can only be used for unsafe math or if one of + // the operands is known to be nonzero. + if ((CC == ISD::SETGE || CC == ISD::SETOGE || CC == ISD::SETUGE) && + !UnsafeFPMath && + !(DAG.isKnownNeverZero(LHS) || DAG.isKnownNeverZero(RHS))) + break; + Opcode = IsReversed ? ARMISD::FMIN : ARMISD::FMAX; + break; + } + + if (!Opcode) + return SDValue(); + return DAG.getNode(Opcode, N->getDebugLoc(), N->getValueType(0), LHS, RHS); +} + +SDValue ARMTargetLowering::PerformDAGCombine(SDNode *N, + DAGCombinerInfo &DCI) const { + switch (N->getOpcode()) { + default: break; + case ISD::ADD: return PerformADDCombine(N, DCI); + case ISD::SUB: return PerformSUBCombine(N, DCI); + case ISD::MUL: return PerformMULCombine(N, DCI, Subtarget); + case ARMISD::VMOVRRD: return PerformVMOVRRDCombine(N, DCI); + case ISD::INTRINSIC_WO_CHAIN: return PerformIntrinsicCombine(N, DCI.DAG); + case ISD::SHL: + case ISD::SRA: + case ISD::SRL: return PerformShiftCombine(N, DCI.DAG, Subtarget); + case ISD::SIGN_EXTEND: + case ISD::ZERO_EXTEND: + case ISD::ANY_EXTEND: return PerformExtendCombine(N, DCI.DAG, Subtarget); + case ISD::SELECT_CC: return PerformSELECT_CCCombine(N, DCI.DAG, Subtarget); + } + return SDValue(); +} + +bool ARMTargetLowering::allowsUnalignedMemoryAccesses(EVT VT) const { + if (!Subtarget->hasV6Ops()) + // Pre-v6 does not support unaligned mem access. + return false; + else { + // v6+ may or may not support unaligned mem access depending on the system + // configuration. + // FIXME: This is pretty conservative. Should we provide cmdline option to + // control the behaviour? + if (!Subtarget->isTargetDarwin()) + return false; + } + + switch (VT.getSimpleVT().SimpleTy) { + default: + return false; + case MVT::i8: + case MVT::i16: + case MVT::i32: + return true; + // FIXME: VLD1 etc with standard alignment is legal. + } +} + +static bool isLegalT1AddressImmediate(int64_t V, EVT VT) { + if (V < 0) + return false; + + unsigned Scale = 1; + switch (VT.getSimpleVT().SimpleTy) { + default: return false; + case MVT::i1: + case MVT::i8: + // Scale == 1; + break; + case MVT::i16: + // Scale == 2; + Scale = 2; + break; + case MVT::i32: + // Scale == 4; + Scale = 4; + break; + } + + if ((V & (Scale - 1)) != 0) + return false; + V /= Scale; + return V == (V & ((1LL << 5) - 1)); +} + +static bool isLegalT2AddressImmediate(int64_t V, EVT VT, + const ARMSubtarget *Subtarget) { + bool isNeg = false; + if (V < 0) { + isNeg = true; + V = - V; + } + + switch (VT.getSimpleVT().SimpleTy) { + default: return false; + case MVT::i1: + case MVT::i8: + case MVT::i16: + case MVT::i32: + // + imm12 or - imm8 + if (isNeg) + return V == (V & ((1LL << 8) - 1)); + return V == (V & ((1LL << 12) - 1)); + case MVT::f32: + case MVT::f64: + // Same as ARM mode. FIXME: NEON? + if (!Subtarget->hasVFP2()) + return false; + if ((V & 3) != 0) + return false; + V >>= 2; + return V == (V & ((1LL << 8) - 1)); + } +} + +/// isLegalAddressImmediate - Return true if the integer value can be used +/// as the offset of the target addressing mode for load / store of the +/// given type. +static bool isLegalAddressImmediate(int64_t V, EVT VT, + const ARMSubtarget *Subtarget) { + if (V == 0) + return true; + + if (!VT.isSimple()) + return false; + + if (Subtarget->isThumb1Only()) + return isLegalT1AddressImmediate(V, VT); + else if (Subtarget->isThumb2()) + return isLegalT2AddressImmediate(V, VT, Subtarget); + + // ARM mode. + if (V < 0) + V = - V; + switch (VT.getSimpleVT().SimpleTy) { + default: return false; + case MVT::i1: + case MVT::i8: + case MVT::i32: + // +- imm12 + return V == (V & ((1LL << 12) - 1)); + case MVT::i16: + // +- imm8 + return V == (V & ((1LL << 8) - 1)); + case MVT::f32: + case MVT::f64: + if (!Subtarget->hasVFP2()) // FIXME: NEON? + return false; + if ((V & 3) != 0) + return false; + V >>= 2; + return V == (V & ((1LL << 8) - 1)); + } +} + +bool ARMTargetLowering::isLegalT2ScaledAddressingMode(const AddrMode &AM, + EVT VT) const { + int Scale = AM.Scale; + if (Scale < 0) + return false; + + switch (VT.getSimpleVT().SimpleTy) { + default: return false; + case MVT::i1: + case MVT::i8: + case MVT::i16: + case MVT::i32: + if (Scale == 1) + return true; + // r + r << imm + Scale = Scale & ~1; + return Scale == 2 || Scale == 4 || Scale == 8; + case MVT::i64: + // r + r + if (((unsigned)AM.HasBaseReg + Scale) <= 2) + return true; + return false; + case MVT::isVoid: + // Note, we allow "void" uses (basically, uses that aren't loads or + // stores), because arm allows folding a scale into many arithmetic + // operations. This should be made more precise and revisited later. + + // Allow r << imm, but the imm has to be a multiple of two. + if (Scale & 1) return false; + return isPowerOf2_32(Scale); + } +} + +/// isLegalAddressingMode - Return true if the addressing mode represented +/// by AM is legal for this target, for a load/store of the specified type. +bool ARMTargetLowering::isLegalAddressingMode(const AddrMode &AM, + const Type *Ty) const { + EVT VT = getValueType(Ty, true); + if (!isLegalAddressImmediate(AM.BaseOffs, VT, Subtarget)) + return false; + + // Can never fold addr of global into load/store. + if (AM.BaseGV) + return false; + + switch (AM.Scale) { + case 0: // no scale reg, must be "r+i" or "r", or "i". + break; + case 1: + if (Subtarget->isThumb1Only()) + return false; + // FALL THROUGH. + default: + // ARM doesn't support any R+R*scale+imm addr modes. + if (AM.BaseOffs) + return false; + + if (!VT.isSimple()) + return false; + + if (Subtarget->isThumb2()) + return isLegalT2ScaledAddressingMode(AM, VT); + + int Scale = AM.Scale; + switch (VT.getSimpleVT().SimpleTy) { + default: return false; + case MVT::i1: + case MVT::i8: + case MVT::i32: + if (Scale < 0) Scale = -Scale; + if (Scale == 1) + return true; + // r + r << imm + return isPowerOf2_32(Scale & ~1); + case MVT::i16: + case MVT::i64: + // r + r + if (((unsigned)AM.HasBaseReg + Scale) <= 2) + return true; + return false; + + case MVT::isVoid: + // Note, we allow "void" uses (basically, uses that aren't loads or + // stores), because arm allows folding a scale into many arithmetic + // operations. This should be made more precise and revisited later. + + // Allow r << imm, but the imm has to be a multiple of two. + if (Scale & 1) return false; + return isPowerOf2_32(Scale); + } + break; + } + return true; +} + +/// isLegalICmpImmediate - Return true if the specified immediate is legal +/// icmp immediate, that is the target has icmp instructions which can compare +/// a register against the immediate without having to materialize the +/// immediate into a register. +bool ARMTargetLowering::isLegalICmpImmediate(int64_t Imm) const { + if (!Subtarget->isThumb()) + return ARM_AM::getSOImmVal(Imm) != -1; + if (Subtarget->isThumb2()) + return ARM_AM::getT2SOImmVal(Imm) != -1; + return Imm >= 0 && Imm <= 255; +} + +static bool getARMIndexedAddressParts(SDNode *Ptr, EVT VT, + bool isSEXTLoad, SDValue &Base, + SDValue &Offset, bool &isInc, + SelectionDAG &DAG) { + if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB) + return false; + + if (VT == MVT::i16 || ((VT == MVT::i8 || VT == MVT::i1) && isSEXTLoad)) { + // AddressingMode 3 + Base = Ptr->getOperand(0); + if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) { + int RHSC = (int)RHS->getZExtValue(); + if (RHSC < 0 && RHSC > -256) { + assert(Ptr->getOpcode() == ISD::ADD); + isInc = false; + Offset = DAG.getConstant(-RHSC, RHS->getValueType(0)); + return true; + } + } + isInc = (Ptr->getOpcode() == ISD::ADD); + Offset = Ptr->getOperand(1); + return true; + } else if (VT == MVT::i32 || VT == MVT::i8 || VT == MVT::i1) { + // AddressingMode 2 + if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) { + int RHSC = (int)RHS->getZExtValue(); + if (RHSC < 0 && RHSC > -0x1000) { + assert(Ptr->getOpcode() == ISD::ADD); + isInc = false; + Offset = DAG.getConstant(-RHSC, RHS->getValueType(0)); + Base = Ptr->getOperand(0); + return true; + } + } + + if (Ptr->getOpcode() == ISD::ADD) { + isInc = true; + ARM_AM::ShiftOpc ShOpcVal= ARM_AM::getShiftOpcForNode(Ptr->getOperand(0)); + if (ShOpcVal != ARM_AM::no_shift) { + Base = Ptr->getOperand(1); + Offset = Ptr->getOperand(0); + } else { + Base = Ptr->getOperand(0); + Offset = Ptr->getOperand(1); + } + return true; + } + + isInc = (Ptr->getOpcode() == ISD::ADD); + Base = Ptr->getOperand(0); + Offset = Ptr->getOperand(1); + return true; + } + + // FIXME: Use VLDM / VSTM to emulate indexed FP load / store. + return false; +} + +static bool getT2IndexedAddressParts(SDNode *Ptr, EVT VT, + bool isSEXTLoad, SDValue &Base, + SDValue &Offset, bool &isInc, + SelectionDAG &DAG) { + if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB) + return false; + + Base = Ptr->getOperand(0); + if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) { + int RHSC = (int)RHS->getZExtValue(); + if (RHSC < 0 && RHSC > -0x100) { // 8 bits. + assert(Ptr->getOpcode() == ISD::ADD); + isInc = false; + Offset = DAG.getConstant(-RHSC, RHS->getValueType(0)); + return true; + } else if (RHSC > 0 && RHSC < 0x100) { // 8 bit, no zero. + isInc = Ptr->getOpcode() == ISD::ADD; + Offset = DAG.getConstant(RHSC, RHS->getValueType(0)); + return true; + } + } + + return false; +} + +/// getPreIndexedAddressParts - returns true by value, base pointer and +/// offset pointer and addressing mode by reference if the node's address +/// can be legally represented as pre-indexed load / store address. +bool +ARMTargetLowering::getPreIndexedAddressParts(SDNode *N, SDValue &Base, + SDValue &Offset, + ISD::MemIndexedMode &AM, + SelectionDAG &DAG) const { + if (Subtarget->isThumb1Only()) + return false; + + EVT VT; + SDValue Ptr; + bool isSEXTLoad = false; + if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) { + Ptr = LD->getBasePtr(); + VT = LD->getMemoryVT(); + isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD; + } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) { + Ptr = ST->getBasePtr(); + VT = ST->getMemoryVT(); + } else + return false; + + bool isInc; + bool isLegal = false; + if (Subtarget->isThumb2()) + isLegal = getT2IndexedAddressParts(Ptr.getNode(), VT, isSEXTLoad, Base, + Offset, isInc, DAG); + else + isLegal = getARMIndexedAddressParts(Ptr.getNode(), VT, isSEXTLoad, Base, + Offset, isInc, DAG); + if (!isLegal) + return false; + + AM = isInc ? ISD::PRE_INC : ISD::PRE_DEC; + return true; +} + +/// getPostIndexedAddressParts - returns true by value, base pointer and +/// offset pointer and addressing mode by reference if this node can be +/// combined with a load / store to form a post-indexed load / store. +bool ARMTargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op, + SDValue &Base, + SDValue &Offset, + ISD::MemIndexedMode &AM, + SelectionDAG &DAG) const { + if (Subtarget->isThumb1Only()) + return false; + + EVT VT; + SDValue Ptr; + bool isSEXTLoad = false; + if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) { + VT = LD->getMemoryVT(); + Ptr = LD->getBasePtr(); + isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD; + } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) { + VT = ST->getMemoryVT(); + Ptr = ST->getBasePtr(); + } else + return false; + + bool isInc; + bool isLegal = false; + if (Subtarget->isThumb2()) + isLegal = getT2IndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset, + isInc, DAG); + else + isLegal = getARMIndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset, + isInc, DAG); + if (!isLegal) + return false; + + if (Ptr != Base) { + // Swap base ptr and offset to catch more post-index load / store when + // it's legal. In Thumb2 mode, offset must be an immediate. + if (Ptr == Offset && Op->getOpcode() == ISD::ADD && + !Subtarget->isThumb2()) + std::swap(Base, Offset); + + // Post-indexed load / store update the base pointer. + if (Ptr != Base) + return false; + } + + AM = isInc ? ISD::POST_INC : ISD::POST_DEC; + return true; +} + +void ARMTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op, + const APInt &Mask, + APInt &KnownZero, + APInt &KnownOne, + const SelectionDAG &DAG, + unsigned Depth) const { + KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0); + switch (Op.getOpcode()) { + default: break; + case ARMISD::CMOV: { + // Bits are known zero/one if known on the LHS and RHS. + DAG.ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1); + if (KnownZero == 0 && KnownOne == 0) return; + + APInt KnownZeroRHS, KnownOneRHS; + DAG.ComputeMaskedBits(Op.getOperand(1), Mask, + KnownZeroRHS, KnownOneRHS, Depth+1); + KnownZero &= KnownZeroRHS; + KnownOne &= KnownOneRHS; + return; + } + } +} + +//===----------------------------------------------------------------------===// +// ARM Inline Assembly Support +//===----------------------------------------------------------------------===// + +/// getConstraintType - Given a constraint letter, return the type of +/// constraint it is for this target. +ARMTargetLowering::ConstraintType +ARMTargetLowering::getConstraintType(const std::string &Constraint) const { + if (Constraint.size() == 1) { + switch (Constraint[0]) { + default: break; + case 'l': return C_RegisterClass; + case 'w': return C_RegisterClass; + } + } + return TargetLowering::getConstraintType(Constraint); +} + +std::pair<unsigned, const TargetRegisterClass*> +ARMTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint, + EVT VT) const { + if (Constraint.size() == 1) { + // GCC ARM Constraint Letters + switch (Constraint[0]) { + case 'l': + if (Subtarget->isThumb()) + return std::make_pair(0U, ARM::tGPRRegisterClass); + else + return std::make_pair(0U, ARM::GPRRegisterClass); + case 'r': + return std::make_pair(0U, ARM::GPRRegisterClass); + case 'w': + if (VT == MVT::f32) + return std::make_pair(0U, ARM::SPRRegisterClass); + if (VT.getSizeInBits() == 64) + return std::make_pair(0U, ARM::DPRRegisterClass); + if (VT.getSizeInBits() == 128) + return std::make_pair(0U, ARM::QPRRegisterClass); + break; + } + } + if (StringRef("{cc}").equals_lower(Constraint)) + return std::make_pair(0U, ARM::CCRRegisterClass); + + return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT); +} + +std::vector<unsigned> ARMTargetLowering:: +getRegClassForInlineAsmConstraint(const std::string &Constraint, + EVT VT) const { + if (Constraint.size() != 1) + return std::vector<unsigned>(); + + switch (Constraint[0]) { // GCC ARM Constraint Letters + default: break; + case 'l': + return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3, + ARM::R4, ARM::R5, ARM::R6, ARM::R7, + 0); + case 'r': + return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3, + ARM::R4, ARM::R5, ARM::R6, ARM::R7, + ARM::R8, ARM::R9, ARM::R10, ARM::R11, + ARM::R12, ARM::LR, 0); + case 'w': + if (VT == MVT::f32) + return make_vector<unsigned>(ARM::S0, ARM::S1, ARM::S2, ARM::S3, + ARM::S4, ARM::S5, ARM::S6, ARM::S7, + ARM::S8, ARM::S9, ARM::S10, ARM::S11, + ARM::S12,ARM::S13,ARM::S14,ARM::S15, + ARM::S16,ARM::S17,ARM::S18,ARM::S19, + ARM::S20,ARM::S21,ARM::S22,ARM::S23, + ARM::S24,ARM::S25,ARM::S26,ARM::S27, + ARM::S28,ARM::S29,ARM::S30,ARM::S31, 0); + if (VT.getSizeInBits() == 64) + return make_vector<unsigned>(ARM::D0, ARM::D1, ARM::D2, ARM::D3, + ARM::D4, ARM::D5, ARM::D6, ARM::D7, + ARM::D8, ARM::D9, ARM::D10,ARM::D11, + ARM::D12,ARM::D13,ARM::D14,ARM::D15, 0); + if (VT.getSizeInBits() == 128) + return make_vector<unsigned>(ARM::Q0, ARM::Q1, ARM::Q2, ARM::Q3, + ARM::Q4, ARM::Q5, ARM::Q6, ARM::Q7, 0); + break; + } + + return std::vector<unsigned>(); +} + +/// LowerAsmOperandForConstraint - Lower the specified operand into the Ops +/// vector. If it is invalid, don't add anything to Ops. +void ARMTargetLowering::LowerAsmOperandForConstraint(SDValue Op, + char Constraint, + bool hasMemory, + std::vector<SDValue>&Ops, + SelectionDAG &DAG) const { + SDValue Result(0, 0); + + switch (Constraint) { + default: break; + case 'I': case 'J': case 'K': case 'L': + case 'M': case 'N': case 'O': + ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op); + if (!C) + return; + + int64_t CVal64 = C->getSExtValue(); + int CVal = (int) CVal64; + // None of these constraints allow values larger than 32 bits. Check + // that the value fits in an int. + if (CVal != CVal64) + return; + + switch (Constraint) { + case 'I': + if (Subtarget->isThumb1Only()) { + // This must be a constant between 0 and 255, for ADD + // immediates. + if (CVal >= 0 && CVal <= 255) + break; + } else if (Subtarget->isThumb2()) { + // A constant that can be used as an immediate value in a + // data-processing instruction. + if (ARM_AM::getT2SOImmVal(CVal) != -1) + break; + } else { + // A constant that can be used as an immediate value in a + // data-processing instruction. + if (ARM_AM::getSOImmVal(CVal) != -1) + break; + } + return; + + case 'J': + if (Subtarget->isThumb()) { // FIXME thumb2 + // This must be a constant between -255 and -1, for negated ADD + // immediates. This can be used in GCC with an "n" modifier that + // prints the negated value, for use with SUB instructions. It is + // not useful otherwise but is implemented for compatibility. + if (CVal >= -255 && CVal <= -1) + break; + } else { + // This must be a constant between -4095 and 4095. It is not clear + // what this constraint is intended for. Implemented for + // compatibility with GCC. + if (CVal >= -4095 && CVal <= 4095) + break; + } + return; + + case 'K': + if (Subtarget->isThumb1Only()) { + // A 32-bit value where only one byte has a nonzero value. Exclude + // zero to match GCC. This constraint is used by GCC internally for + // constants that can be loaded with a move/shift combination. + // It is not useful otherwise but is implemented for compatibility. + if (CVal != 0 && ARM_AM::isThumbImmShiftedVal(CVal)) + break; + } else if (Subtarget->isThumb2()) { + // A constant whose bitwise inverse can be used as an immediate + // value in a data-processing instruction. This can be used in GCC + // with a "B" modifier that prints the inverted value, for use with + // BIC and MVN instructions. It is not useful otherwise but is + // implemented for compatibility. + if (ARM_AM::getT2SOImmVal(~CVal) != -1) + break; + } else { + // A constant whose bitwise inverse can be used as an immediate + // value in a data-processing instruction. This can be used in GCC + // with a "B" modifier that prints the inverted value, for use with + // BIC and MVN instructions. It is not useful otherwise but is + // implemented for compatibility. + if (ARM_AM::getSOImmVal(~CVal) != -1) + break; + } + return; + + case 'L': + if (Subtarget->isThumb1Only()) { + // This must be a constant between -7 and 7, + // for 3-operand ADD/SUB immediate instructions. + if (CVal >= -7 && CVal < 7) + break; + } else if (Subtarget->isThumb2()) { + // A constant whose negation can be used as an immediate value in a + // data-processing instruction. This can be used in GCC with an "n" + // modifier that prints the negated value, for use with SUB + // instructions. It is not useful otherwise but is implemented for + // compatibility. + if (ARM_AM::getT2SOImmVal(-CVal) != -1) + break; + } else { + // A constant whose negation can be used as an immediate value in a + // data-processing instruction. This can be used in GCC with an "n" + // modifier that prints the negated value, for use with SUB + // instructions. It is not useful otherwise but is implemented for + // compatibility. + if (ARM_AM::getSOImmVal(-CVal) != -1) + break; + } + return; + + case 'M': + if (Subtarget->isThumb()) { // FIXME thumb2 + // This must be a multiple of 4 between 0 and 1020, for + // ADD sp + immediate. + if ((CVal >= 0 && CVal <= 1020) && ((CVal & 3) == 0)) + break; + } else { + // A power of two or a constant between 0 and 32. This is used in + // GCC for the shift amount on shifted register operands, but it is + // useful in general for any shift amounts. + if ((CVal >= 0 && CVal <= 32) || ((CVal & (CVal - 1)) == 0)) + break; + } + return; + + case 'N': + if (Subtarget->isThumb()) { // FIXME thumb2 + // This must be a constant between 0 and 31, for shift amounts. + if (CVal >= 0 && CVal <= 31) + break; + } + return; + + case 'O': + if (Subtarget->isThumb()) { // FIXME thumb2 + // This must be a multiple of 4 between -508 and 508, for + // ADD/SUB sp = sp + immediate. + if ((CVal >= -508 && CVal <= 508) && ((CVal & 3) == 0)) + break; + } + return; + } + Result = DAG.getTargetConstant(CVal, Op.getValueType()); + break; + } + + if (Result.getNode()) { + Ops.push_back(Result); + return; + } + return TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, hasMemory, + Ops, DAG); +} + +bool +ARMTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const { + // The ARM target isn't yet aware of offsets. + return false; +} + +int ARM::getVFPf32Imm(const APFloat &FPImm) { + APInt Imm = FPImm.bitcastToAPInt(); + uint32_t Sign = Imm.lshr(31).getZExtValue() & 1; + int32_t Exp = (Imm.lshr(23).getSExtValue() & 0xff) - 127; // -126 to 127 + int64_t Mantissa = Imm.getZExtValue() & 0x7fffff; // 23 bits + + // We can handle 4 bits of mantissa. + // mantissa = (16+UInt(e:f:g:h))/16. + if (Mantissa & 0x7ffff) + return -1; + Mantissa >>= 19; + if ((Mantissa & 0xf) != Mantissa) + return -1; + + // We can handle 3 bits of exponent: exp == UInt(NOT(b):c:d)-3 + if (Exp < -3 || Exp > 4) + return -1; + Exp = ((Exp+3) & 0x7) ^ 4; + + return ((int)Sign << 7) | (Exp << 4) | Mantissa; +} + +int ARM::getVFPf64Imm(const APFloat &FPImm) { + APInt Imm = FPImm.bitcastToAPInt(); + uint64_t Sign = Imm.lshr(63).getZExtValue() & 1; + int64_t Exp = (Imm.lshr(52).getSExtValue() & 0x7ff) - 1023; // -1022 to 1023 + uint64_t Mantissa = Imm.getZExtValue() & 0xfffffffffffffLL; + + // We can handle 4 bits of mantissa. + // mantissa = (16+UInt(e:f:g:h))/16. + if (Mantissa & 0xffffffffffffLL) + return -1; + Mantissa >>= 48; + if ((Mantissa & 0xf) != Mantissa) + return -1; + + // We can handle 3 bits of exponent: exp == UInt(NOT(b):c:d)-3 + if (Exp < -3 || Exp > 4) + return -1; + Exp = ((Exp+3) & 0x7) ^ 4; + + return ((int)Sign << 7) | (Exp << 4) | Mantissa; +} + +/// isFPImmLegal - Returns true if the target can instruction select the +/// specified FP immediate natively. If false, the legalizer will +/// materialize the FP immediate as a load from a constant pool. +bool ARMTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const { + if (!Subtarget->hasVFP3()) + return false; + if (VT == MVT::f32) + return ARM::getVFPf32Imm(Imm) != -1; + if (VT == MVT::f64) + return ARM::getVFPf64Imm(Imm) != -1; + return false; +} |
