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+//===-- SystemZISelLowering.h - SystemZ DAG lowering interface --*- C++ -*-===//
+//
+// 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 SystemZ uses to lower LLVM code into a
+// selection DAG.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZISELLOWERING_H
+#define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZISELLOWERING_H
+
+#include "SystemZ.h"
+#include "llvm/CodeGen/MachineBasicBlock.h"
+#include "llvm/CodeGen/SelectionDAG.h"
+#include "llvm/Target/TargetLowering.h"
+
+namespace llvm {
+namespace SystemZISD {
+enum NodeType : unsigned {
+ FIRST_NUMBER = ISD::BUILTIN_OP_END,
+
+ // Return with a flag operand. Operand 0 is the chain operand.
+ RET_FLAG,
+
+ // Calls a function. Operand 0 is the chain operand and operand 1
+ // is the target address. The arguments start at operand 2.
+ // There is an optional glue operand at the end.
+ CALL,
+ SIBCALL,
+
+ // TLS calls. Like regular calls, except operand 1 is the TLS symbol.
+ // (The call target is implicitly __tls_get_offset.)
+ TLS_GDCALL,
+ TLS_LDCALL,
+
+ // Wraps a TargetGlobalAddress that should be loaded using PC-relative
+ // accesses (LARL). Operand 0 is the address.
+ PCREL_WRAPPER,
+
+ // Used in cases where an offset is applied to a TargetGlobalAddress.
+ // Operand 0 is the full TargetGlobalAddress and operand 1 is a
+ // PCREL_WRAPPER for an anchor point. This is used so that we can
+ // cheaply refer to either the full address or the anchor point
+ // as a register base.
+ PCREL_OFFSET,
+
+ // Integer absolute.
+ IABS,
+
+ // Integer comparisons. There are three operands: the two values
+ // to compare, and an integer of type SystemZICMP.
+ ICMP,
+
+ // Floating-point comparisons. The two operands are the values to compare.
+ FCMP,
+
+ // Test under mask. The first operand is ANDed with the second operand
+ // and the condition codes are set on the result. The third operand is
+ // a boolean that is true if the condition codes need to distinguish
+ // between CCMASK_TM_MIXED_MSB_0 and CCMASK_TM_MIXED_MSB_1 (which the
+ // register forms do but the memory forms don't).
+ TM,
+
+ // Branches if a condition is true. Operand 0 is the chain operand;
+ // operand 1 is the 4-bit condition-code mask, with bit N in
+ // big-endian order meaning "branch if CC=N"; operand 2 is the
+ // target block and operand 3 is the flag operand.
+ BR_CCMASK,
+
+ // Selects between operand 0 and operand 1. Operand 2 is the
+ // mask of condition-code values for which operand 0 should be
+ // chosen over operand 1; it has the same form as BR_CCMASK.
+ // Operand 3 is the flag operand.
+ SELECT_CCMASK,
+
+ // Evaluates to the gap between the stack pointer and the
+ // base of the dynamically-allocatable area.
+ ADJDYNALLOC,
+
+ // Extracts the value of a 32-bit access register. Operand 0 is
+ // the number of the register.
+ EXTRACT_ACCESS,
+
+ // Count number of bits set in operand 0 per byte.
+ POPCNT,
+
+ // Wrappers around the ISD opcodes of the same name. The output and
+ // first input operands are GR128s. The trailing numbers are the
+ // widths of the second operand in bits.
+ UMUL_LOHI64,
+ SDIVREM32,
+ SDIVREM64,
+ UDIVREM32,
+ UDIVREM64,
+
+ // Use a series of MVCs to copy bytes from one memory location to another.
+ // The operands are:
+ // - the target address
+ // - the source address
+ // - the constant length
+ //
+ // This isn't a memory opcode because we'd need to attach two
+ // MachineMemOperands rather than one.
+ MVC,
+
+ // Like MVC, but implemented as a loop that handles X*256 bytes
+ // followed by straight-line code to handle the rest (if any).
+ // The value of X is passed as an additional operand.
+ MVC_LOOP,
+
+ // Similar to MVC and MVC_LOOP, but for logic operations (AND, OR, XOR).
+ NC,
+ NC_LOOP,
+ OC,
+ OC_LOOP,
+ XC,
+ XC_LOOP,
+
+ // Use CLC to compare two blocks of memory, with the same comments
+ // as for MVC and MVC_LOOP.
+ CLC,
+ CLC_LOOP,
+
+ // Use an MVST-based sequence to implement stpcpy().
+ STPCPY,
+
+ // Use a CLST-based sequence to implement strcmp(). The two input operands
+ // are the addresses of the strings to compare.
+ STRCMP,
+
+ // Use an SRST-based sequence to search a block of memory. The first
+ // operand is the end address, the second is the start, and the third
+ // is the character to search for. CC is set to 1 on success and 2
+ // on failure.
+ SEARCH_STRING,
+
+ // Store the CC value in bits 29 and 28 of an integer.
+ IPM,
+
+ // Perform a serialization operation. (BCR 15,0 or BCR 14,0.)
+ SERIALIZE,
+
+ // Transaction begin. The first operand is the chain, the second
+ // the TDB pointer, and the third the immediate control field.
+ // Returns chain and glue.
+ TBEGIN,
+ TBEGIN_NOFLOAT,
+
+ // Transaction end. Just the chain operand. Returns chain and glue.
+ TEND,
+
+ // Create a vector constant by filling byte N of the result with bit
+ // 15-N of the single operand.
+ BYTE_MASK,
+
+ // Create a vector constant by replicating an element-sized RISBG-style mask.
+ // The first operand specifies the starting set bit and the second operand
+ // specifies the ending set bit. Both operands count from the MSB of the
+ // element.
+ ROTATE_MASK,
+
+ // Replicate a GPR scalar value into all elements of a vector.
+ REPLICATE,
+
+ // Create a vector from two i64 GPRs.
+ JOIN_DWORDS,
+
+ // Replicate one element of a vector into all elements. The first operand
+ // is the vector and the second is the index of the element to replicate.
+ SPLAT,
+
+ // Interleave elements from the high half of operand 0 and the high half
+ // of operand 1.
+ MERGE_HIGH,
+
+ // Likewise for the low halves.
+ MERGE_LOW,
+
+ // Concatenate the vectors in the first two operands, shift them left
+ // by the third operand, and take the first half of the result.
+ SHL_DOUBLE,
+
+ // Take one element of the first v2i64 operand and the one element of
+ // the second v2i64 operand and concatenate them to form a v2i64 result.
+ // The third operand is a 4-bit value of the form 0A0B, where A and B
+ // are the element selectors for the first operand and second operands
+ // respectively.
+ PERMUTE_DWORDS,
+
+ // Perform a general vector permute on vector operands 0 and 1.
+ // Each byte of operand 2 controls the corresponding byte of the result,
+ // in the same way as a byte-level VECTOR_SHUFFLE mask.
+ PERMUTE,
+
+ // Pack vector operands 0 and 1 into a single vector with half-sized elements.
+ PACK,
+
+ // Likewise, but saturate the result and set CC. PACKS_CC does signed
+ // saturation and PACKLS_CC does unsigned saturation.
+ PACKS_CC,
+ PACKLS_CC,
+
+ // Unpack the first half of vector operand 0 into double-sized elements.
+ // UNPACK_HIGH sign-extends and UNPACKL_HIGH zero-extends.
+ UNPACK_HIGH,
+ UNPACKL_HIGH,
+
+ // Likewise for the second half.
+ UNPACK_LOW,
+ UNPACKL_LOW,
+
+ // Shift each element of vector operand 0 by the number of bits specified
+ // by scalar operand 1.
+ VSHL_BY_SCALAR,
+ VSRL_BY_SCALAR,
+ VSRA_BY_SCALAR,
+
+ // For each element of the output type, sum across all sub-elements of
+ // operand 0 belonging to the corresponding element, and add in the
+ // rightmost sub-element of the corresponding element of operand 1.
+ VSUM,
+
+ // Compare integer vector operands 0 and 1 to produce the usual 0/-1
+ // vector result. VICMPE is for equality, VICMPH for "signed greater than"
+ // and VICMPHL for "unsigned greater than".
+ VICMPE,
+ VICMPH,
+ VICMPHL,
+
+ // Likewise, but also set the condition codes on the result.
+ VICMPES,
+ VICMPHS,
+ VICMPHLS,
+
+ // Compare floating-point vector operands 0 and 1 to preoduce the usual 0/-1
+ // vector result. VFCMPE is for "ordered and equal", VFCMPH for "ordered and
+ // greater than" and VFCMPHE for "ordered and greater than or equal to".
+ VFCMPE,
+ VFCMPH,
+ VFCMPHE,
+
+ // Likewise, but also set the condition codes on the result.
+ VFCMPES,
+ VFCMPHS,
+ VFCMPHES,
+
+ // Test floating-point data class for vectors.
+ VFTCI,
+
+ // Extend the even f32 elements of vector operand 0 to produce a vector
+ // of f64 elements.
+ VEXTEND,
+
+ // Round the f64 elements of vector operand 0 to f32s and store them in the
+ // even elements of the result.
+ VROUND,
+
+ // AND the two vector operands together and set CC based on the result.
+ VTM,
+
+ // String operations that set CC as a side-effect.
+ VFAE_CC,
+ VFAEZ_CC,
+ VFEE_CC,
+ VFEEZ_CC,
+ VFENE_CC,
+ VFENEZ_CC,
+ VISTR_CC,
+ VSTRC_CC,
+ VSTRCZ_CC,
+
+ // Wrappers around the inner loop of an 8- or 16-bit ATOMIC_SWAP or
+ // ATOMIC_LOAD_<op>.
+ //
+ // Operand 0: the address of the containing 32-bit-aligned field
+ // Operand 1: the second operand of <op>, in the high bits of an i32
+ // for everything except ATOMIC_SWAPW
+ // Operand 2: how many bits to rotate the i32 left to bring the first
+ // operand into the high bits
+ // Operand 3: the negative of operand 2, for rotating the other way
+ // Operand 4: the width of the field in bits (8 or 16)
+ ATOMIC_SWAPW = ISD::FIRST_TARGET_MEMORY_OPCODE,
+ ATOMIC_LOADW_ADD,
+ ATOMIC_LOADW_SUB,
+ ATOMIC_LOADW_AND,
+ ATOMIC_LOADW_OR,
+ ATOMIC_LOADW_XOR,
+ ATOMIC_LOADW_NAND,
+ ATOMIC_LOADW_MIN,
+ ATOMIC_LOADW_MAX,
+ ATOMIC_LOADW_UMIN,
+ ATOMIC_LOADW_UMAX,
+
+ // A wrapper around the inner loop of an ATOMIC_CMP_SWAP.
+ //
+ // Operand 0: the address of the containing 32-bit-aligned field
+ // Operand 1: the compare value, in the low bits of an i32
+ // Operand 2: the swap value, in the low bits of an i32
+ // Operand 3: how many bits to rotate the i32 left to bring the first
+ // operand into the high bits
+ // Operand 4: the negative of operand 2, for rotating the other way
+ // Operand 5: the width of the field in bits (8 or 16)
+ ATOMIC_CMP_SWAPW,
+
+ // Prefetch from the second operand using the 4-bit control code in
+ // the first operand. The code is 1 for a load prefetch and 2 for
+ // a store prefetch.
+ PREFETCH
+};
+
+// Return true if OPCODE is some kind of PC-relative address.
+inline bool isPCREL(unsigned Opcode) {
+ return Opcode == PCREL_WRAPPER || Opcode == PCREL_OFFSET;
+}
+} // end namespace SystemZISD
+
+namespace SystemZICMP {
+// Describes whether an integer comparison needs to be signed or unsigned,
+// or whether either type is OK.
+enum {
+ Any,
+ UnsignedOnly,
+ SignedOnly
+};
+} // end namespace SystemZICMP
+
+class SystemZSubtarget;
+class SystemZTargetMachine;
+
+class SystemZTargetLowering : public TargetLowering {
+public:
+ explicit SystemZTargetLowering(const TargetMachine &TM,
+ const SystemZSubtarget &STI);
+
+ // Override TargetLowering.
+ MVT getScalarShiftAmountTy(const DataLayout &, EVT) const override {
+ return MVT::i32;
+ }
+ MVT getVectorIdxTy(const DataLayout &DL) const override {
+ // Only the lower 12 bits of an element index are used, so we don't
+ // want to clobber the upper 32 bits of a GPR unnecessarily.
+ return MVT::i32;
+ }
+ TargetLoweringBase::LegalizeTypeAction getPreferredVectorAction(EVT VT)
+ const override {
+ // Widen subvectors to the full width rather than promoting integer
+ // elements. This is better because:
+ //
+ // (a) it means that we can handle the ABI for passing and returning
+ // sub-128 vectors without having to handle them as legal types.
+ //
+ // (b) we don't have instructions to extend on load and truncate on store,
+ // so promoting the integers is less efficient.
+ //
+ // (c) there are no multiplication instructions for the widest integer
+ // type (v2i64).
+ if (VT.getVectorElementType().getSizeInBits() % 8 == 0)
+ return TypeWidenVector;
+ return TargetLoweringBase::getPreferredVectorAction(VT);
+ }
+ EVT getSetCCResultType(const DataLayout &DL, LLVMContext &,
+ EVT) const override;
+ bool isFMAFasterThanFMulAndFAdd(EVT VT) const override;
+ bool isFPImmLegal(const APFloat &Imm, EVT VT) const override;
+ bool isLegalICmpImmediate(int64_t Imm) const override;
+ bool isLegalAddImmediate(int64_t Imm) const override;
+ bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty,
+ unsigned AS) const override;
+ bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AS,
+ unsigned Align,
+ bool *Fast) const override;
+ bool isTruncateFree(Type *, Type *) const override;
+ bool isTruncateFree(EVT, EVT) const override;
+ const char *getTargetNodeName(unsigned Opcode) const override;
+ std::pair<unsigned, const TargetRegisterClass *>
+ getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
+ StringRef Constraint, MVT VT) const override;
+ TargetLowering::ConstraintType
+ getConstraintType(StringRef Constraint) const override;
+ TargetLowering::ConstraintWeight
+ getSingleConstraintMatchWeight(AsmOperandInfo &info,
+ const char *constraint) const override;
+ void LowerAsmOperandForConstraint(SDValue Op,
+ std::string &Constraint,
+ std::vector<SDValue> &Ops,
+ SelectionDAG &DAG) const override;
+
+ unsigned getInlineAsmMemConstraint(StringRef ConstraintCode) const override {
+ if (ConstraintCode.size() == 1) {
+ switch(ConstraintCode[0]) {
+ default:
+ break;
+ case 'Q':
+ return InlineAsm::Constraint_Q;
+ case 'R':
+ return InlineAsm::Constraint_R;
+ case 'S':
+ return InlineAsm::Constraint_S;
+ case 'T':
+ return InlineAsm::Constraint_T;
+ }
+ }
+ return TargetLowering::getInlineAsmMemConstraint(ConstraintCode);
+ }
+
+ /// If a physical register, this returns the register that receives the
+ /// exception address on entry to an EH pad.
+ unsigned
+ getExceptionPointerRegister(const Constant *PersonalityFn) const override {
+ return SystemZ::R6D;
+ }
+
+ /// If a physical register, this returns the register that receives the
+ /// exception typeid on entry to a landing pad.
+ unsigned
+ getExceptionSelectorRegister(const Constant *PersonalityFn) const override {
+ return SystemZ::R7D;
+ }
+
+ MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
+ MachineBasicBlock *BB) const
+ override;
+ SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
+ bool allowTruncateForTailCall(Type *, Type *) const override;
+ bool mayBeEmittedAsTailCall(CallInst *CI) const override;
+ SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv,
+ bool isVarArg,
+ const SmallVectorImpl<ISD::InputArg> &Ins,
+ SDLoc DL, SelectionDAG &DAG,
+ SmallVectorImpl<SDValue> &InVals) const override;
+ SDValue LowerCall(CallLoweringInfo &CLI,
+ SmallVectorImpl<SDValue> &InVals) const override;
+
+ bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
+ bool isVarArg,
+ const SmallVectorImpl<ISD::OutputArg> &Outs,
+ LLVMContext &Context) const override;
+ SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool IsVarArg,
+ const SmallVectorImpl<ISD::OutputArg> &Outs,
+ const SmallVectorImpl<SDValue> &OutVals,
+ SDLoc DL, SelectionDAG &DAG) const override;
+ SDValue prepareVolatileOrAtomicLoad(SDValue Chain, SDLoc DL,
+ SelectionDAG &DAG) const override;
+ SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
+
+private:
+ const SystemZSubtarget &Subtarget;
+
+ // Implement LowerOperation for individual opcodes.
+ SDValue lowerSETCC(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerGlobalAddress(GlobalAddressSDNode *Node,
+ SelectionDAG &DAG) const;
+ SDValue lowerTLSGetOffset(GlobalAddressSDNode *Node,
+ SelectionDAG &DAG, unsigned Opcode,
+ SDValue GOTOffset) const;
+ SDValue lowerGlobalTLSAddress(GlobalAddressSDNode *Node,
+ SelectionDAG &DAG) const;
+ SDValue lowerBlockAddress(BlockAddressSDNode *Node,
+ SelectionDAG &DAG) const;
+ SDValue lowerJumpTable(JumpTableSDNode *JT, SelectionDAG &DAG) const;
+ SDValue lowerConstantPool(ConstantPoolSDNode *CP, SelectionDAG &DAG) const;
+ SDValue lowerVASTART(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerVACOPY(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerSMUL_LOHI(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerUMUL_LOHI(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerSDIVREM(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerUDIVREM(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerBITCAST(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerOR(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerCTPOP(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerATOMIC_LOAD(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerATOMIC_STORE(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerATOMIC_LOAD_OP(SDValue Op, SelectionDAG &DAG,
+ unsigned Opcode) const;
+ SDValue lowerATOMIC_LOAD_SUB(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerATOMIC_CMP_SWAP(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerLOAD_SEQUENCE_POINT(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerSTACKSAVE(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerSTACKRESTORE(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerPREFETCH(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerINTRINSIC_W_CHAIN(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerSCALAR_TO_VECTOR(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerEXTRACT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerExtendVectorInreg(SDValue Op, SelectionDAG &DAG,
+ unsigned UnpackHigh) const;
+ SDValue lowerShift(SDValue Op, SelectionDAG &DAG, unsigned ByScalar) const;
+
+ SDValue combineExtract(SDLoc DL, EVT ElemVT, EVT VecVT, SDValue OrigOp,
+ unsigned Index, DAGCombinerInfo &DCI,
+ bool Force) const;
+ SDValue combineTruncateExtract(SDLoc DL, EVT TruncVT, SDValue Op,
+ DAGCombinerInfo &DCI) const;
+
+ // If the last instruction before MBBI in MBB was some form of COMPARE,
+ // try to replace it with a COMPARE AND BRANCH just before MBBI.
+ // CCMask and Target are the BRC-like operands for the branch.
+ // Return true if the change was made.
+ bool convertPrevCompareToBranch(MachineBasicBlock *MBB,
+ MachineBasicBlock::iterator MBBI,
+ unsigned CCMask,
+ MachineBasicBlock *Target) const;
+
+ // Implement EmitInstrWithCustomInserter for individual operation types.
+ MachineBasicBlock *emitSelect(MachineInstr *MI,
+ MachineBasicBlock *BB) const;
+ MachineBasicBlock *emitCondStore(MachineInstr *MI,
+ MachineBasicBlock *BB,
+ unsigned StoreOpcode, unsigned STOCOpcode,
+ bool Invert) const;
+ MachineBasicBlock *emitExt128(MachineInstr *MI,
+ MachineBasicBlock *MBB,
+ bool ClearEven, unsigned SubReg) const;
+ MachineBasicBlock *emitAtomicLoadBinary(MachineInstr *MI,
+ MachineBasicBlock *BB,
+ unsigned BinOpcode, unsigned BitSize,
+ bool Invert = false) const;
+ MachineBasicBlock *emitAtomicLoadMinMax(MachineInstr *MI,
+ MachineBasicBlock *MBB,
+ unsigned CompareOpcode,
+ unsigned KeepOldMask,
+ unsigned BitSize) const;
+ MachineBasicBlock *emitAtomicCmpSwapW(MachineInstr *MI,
+ MachineBasicBlock *BB) const;
+ MachineBasicBlock *emitMemMemWrapper(MachineInstr *MI,
+ MachineBasicBlock *BB,
+ unsigned Opcode) const;
+ MachineBasicBlock *emitStringWrapper(MachineInstr *MI,
+ MachineBasicBlock *BB,
+ unsigned Opcode) const;
+ MachineBasicBlock *emitTransactionBegin(MachineInstr *MI,
+ MachineBasicBlock *MBB,
+ unsigned Opcode,
+ bool NoFloat) const;
+ MachineBasicBlock *emitLoadAndTestCmp0(MachineInstr *MI,
+ MachineBasicBlock *MBB,
+ unsigned Opcode) const;
+
+};
+} // end namespace llvm
+
+#endif
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