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-rw-r--r--lib/Target/ARM/ThumbInstrInfo.cpp282
1 files changed, 282 insertions, 0 deletions
diff --git a/lib/Target/ARM/ThumbInstrInfo.cpp b/lib/Target/ARM/ThumbInstrInfo.cpp
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+++ b/lib/Target/ARM/ThumbInstrInfo.cpp
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+//===- ThumbInstrInfo.cpp - Thumb Instruction Information --------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the Thumb implementation of the TargetInstrInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ARMInstrInfo.h"
+#include "ARM.h"
+#include "ARMGenInstrInfo.inc"
+#include "ARMMachineFunctionInfo.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/ADT/SmallVector.h"
+#include "ThumbInstrInfo.h"
+
+using namespace llvm;
+
+ThumbInstrInfo::ThumbInstrInfo(const ARMSubtarget &STI)
+ : ARMBaseInstrInfo(STI) {
+}
+
+bool ThumbInstrInfo::isMoveInstr(const MachineInstr &MI,
+ unsigned &SrcReg, unsigned &DstReg,
+ unsigned& SrcSubIdx, unsigned& DstSubIdx) const {
+ SrcSubIdx = DstSubIdx = 0; // No sub-registers.
+
+ unsigned oc = MI.getOpcode();
+ switch (oc) {
+ default:
+ return false;
+ // FIXME: Thumb2
+ case ARM::tMOVr:
+ case ARM::tMOVhir2lor:
+ case ARM::tMOVlor2hir:
+ case ARM::tMOVhir2hir:
+ assert(MI.getDesc().getNumOperands() >= 2 &&
+ MI.getOperand(0).isReg() &&
+ MI.getOperand(1).isReg() &&
+ "Invalid Thumb MOV instruction");
+ SrcReg = MI.getOperand(1).getReg();
+ DstReg = MI.getOperand(0).getReg();
+ return true;
+ }
+}
+
+unsigned ThumbInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
+ int &FrameIndex) const {
+ switch (MI->getOpcode()) {
+ default: break;
+ // FIXME: Thumb2
+ case ARM::tRestore:
+ if (MI->getOperand(1).isFI() &&
+ MI->getOperand(2).isImm() &&
+ MI->getOperand(2).getImm() == 0) {
+ FrameIndex = MI->getOperand(1).getIndex();
+ return MI->getOperand(0).getReg();
+ }
+ break;
+ }
+ return 0;
+}
+
+unsigned ThumbInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
+ int &FrameIndex) const {
+ switch (MI->getOpcode()) {
+ default: break;
+ // FIXME: Thumb2
+ case ARM::tSpill:
+ if (MI->getOperand(1).isFI() &&
+ MI->getOperand(2).isImm() &&
+ MI->getOperand(2).getImm() == 0) {
+ FrameIndex = MI->getOperand(1).getIndex();
+ return MI->getOperand(0).getReg();
+ }
+ break;
+ }
+ return 0;
+}
+
+bool ThumbInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator I,
+ unsigned DestReg, unsigned SrcReg,
+ const TargetRegisterClass *DestRC,
+ const TargetRegisterClass *SrcRC) const {
+ DebugLoc DL = DebugLoc::getUnknownLoc();
+ if (I != MBB.end()) DL = I->getDebugLoc();
+
+ // FIXME: Thumb2
+ if (DestRC == ARM::GPRRegisterClass) {
+ if (SrcRC == ARM::GPRRegisterClass) {
+ BuildMI(MBB, I, DL, get(ARM::tMOVhir2hir), DestReg).addReg(SrcReg);
+ return true;
+ } else if (SrcRC == ARM::tGPRRegisterClass) {
+ BuildMI(MBB, I, DL, get(ARM::tMOVlor2hir), DestReg).addReg(SrcReg);
+ return true;
+ }
+ } else if (DestRC == ARM::tGPRRegisterClass) {
+ if (SrcRC == ARM::GPRRegisterClass) {
+ BuildMI(MBB, I, DL, get(ARM::tMOVhir2lor), DestReg).addReg(SrcReg);
+ return true;
+ } else if (SrcRC == ARM::tGPRRegisterClass) {
+ BuildMI(MBB, I, DL, get(ARM::tMOVr), DestReg).addReg(SrcReg);
+ return true;
+ }
+ }
+
+ return false;
+}
+
+void ThumbInstrInfo::
+storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
+ unsigned SrcReg, bool isKill, int FI,
+ const TargetRegisterClass *RC) const {
+ DebugLoc DL = DebugLoc::getUnknownLoc();
+ if (I != MBB.end()) DL = I->getDebugLoc();
+
+ assert(RC == ARM::tGPRRegisterClass && "Unknown regclass!");
+
+ // FIXME: Thumb2
+ if (RC == ARM::tGPRRegisterClass) {
+ BuildMI(MBB, I, DL, get(ARM::tSpill))
+ .addReg(SrcReg, getKillRegState(isKill))
+ .addFrameIndex(FI).addImm(0);
+ }
+}
+
+void ThumbInstrInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
+ bool isKill,
+ SmallVectorImpl<MachineOperand> &Addr,
+ const TargetRegisterClass *RC,
+ SmallVectorImpl<MachineInstr*> &NewMIs) const{
+ DebugLoc DL = DebugLoc::getUnknownLoc();
+ unsigned Opc = 0;
+
+ // FIXME: Thumb2. Is GPRRegClass here correct?
+ assert(RC == ARM::GPRRegisterClass && "Unknown regclass!");
+ if (RC == ARM::GPRRegisterClass) {
+ Opc = Addr[0].isFI() ? ARM::tSpill : ARM::tSTR;
+ }
+
+ MachineInstrBuilder MIB =
+ BuildMI(MF, DL, get(Opc)).addReg(SrcReg, getKillRegState(isKill));
+ for (unsigned i = 0, e = Addr.size(); i != e; ++i)
+ MIB.addOperand(Addr[i]);
+ NewMIs.push_back(MIB);
+ return;
+}
+
+void ThumbInstrInfo::
+loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
+ unsigned DestReg, int FI,
+ const TargetRegisterClass *RC) const {
+ DebugLoc DL = DebugLoc::getUnknownLoc();
+ if (I != MBB.end()) DL = I->getDebugLoc();
+
+ // FIXME: Thumb2
+ assert(RC == ARM::tGPRRegisterClass && "Unknown regclass!");
+
+ if (RC == ARM::tGPRRegisterClass) {
+ BuildMI(MBB, I, DL, get(ARM::tRestore), DestReg)
+ .addFrameIndex(FI).addImm(0);
+ }
+}
+
+void ThumbInstrInfo::
+loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
+ SmallVectorImpl<MachineOperand> &Addr,
+ const TargetRegisterClass *RC,
+ SmallVectorImpl<MachineInstr*> &NewMIs) const {
+ DebugLoc DL = DebugLoc::getUnknownLoc();
+ unsigned Opc = 0;
+
+ // FIXME: Thumb2. Is GPRRegClass ok here?
+ if (RC == ARM::GPRRegisterClass) {
+ Opc = Addr[0].isFI() ? ARM::tRestore : ARM::tLDR;
+ }
+
+ MachineInstrBuilder MIB = BuildMI(MF, DL, get(Opc), DestReg);
+ for (unsigned i = 0, e = Addr.size(); i != e; ++i)
+ MIB.addOperand(Addr[i]);
+ NewMIs.push_back(MIB);
+ return;
+}
+
+bool ThumbInstrInfo::
+spillCalleeSavedRegisters(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ const std::vector<CalleeSavedInfo> &CSI) const {
+ if (CSI.empty())
+ return false;
+
+ DebugLoc DL = DebugLoc::getUnknownLoc();
+ if (MI != MBB.end()) DL = MI->getDebugLoc();
+
+ MachineInstrBuilder MIB = BuildMI(MBB, MI, DL, get(ARM::tPUSH));
+ for (unsigned i = CSI.size(); i != 0; --i) {
+ unsigned Reg = CSI[i-1].getReg();
+ // Add the callee-saved register as live-in. It's killed at the spill.
+ MBB.addLiveIn(Reg);
+ MIB.addReg(Reg, RegState::Kill);
+ }
+ return true;
+}
+
+bool ThumbInstrInfo::
+restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ const std::vector<CalleeSavedInfo> &CSI) const {
+ MachineFunction &MF = *MBB.getParent();
+ ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
+ if (CSI.empty())
+ return false;
+
+ bool isVarArg = AFI->getVarArgsRegSaveSize() > 0;
+ MachineInstr *PopMI = MF.CreateMachineInstr(get(ARM::tPOP),MI->getDebugLoc());
+ for (unsigned i = CSI.size(); i != 0; --i) {
+ unsigned Reg = CSI[i-1].getReg();
+ if (Reg == ARM::LR) {
+ // Special epilogue for vararg functions. See emitEpilogue
+ if (isVarArg)
+ continue;
+ Reg = ARM::PC;
+ PopMI->setDesc(get(ARM::tPOP_RET));
+ MI = MBB.erase(MI);
+ }
+ PopMI->addOperand(MachineOperand::CreateReg(Reg, true));
+ }
+
+ // It's illegal to emit pop instruction without operands.
+ if (PopMI->getNumOperands() > 0)
+ MBB.insert(MI, PopMI);
+
+ return true;
+}
+
+MachineInstr *ThumbInstrInfo::
+foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
+ const SmallVectorImpl<unsigned> &Ops, int FI) const {
+ if (Ops.size() != 1) return NULL;
+ const ARMRegisterInfo &RI = getRegisterInfo();
+
+ unsigned OpNum = Ops[0];
+ unsigned Opc = MI->getOpcode();
+ MachineInstr *NewMI = NULL;
+ switch (Opc) {
+ default: break;
+ case ARM::tMOVr:
+ case ARM::tMOVlor2hir:
+ case ARM::tMOVhir2lor:
+ case ARM::tMOVhir2hir: {
+ if (OpNum == 0) { // move -> store
+ unsigned SrcReg = MI->getOperand(1).getReg();
+ bool isKill = MI->getOperand(1).isKill();
+ if (RI.isPhysicalRegister(SrcReg) && !RI.isLowRegister(SrcReg))
+ // tSpill cannot take a high register operand.
+ break;
+ NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::tSpill))
+ .addReg(SrcReg, getKillRegState(isKill))
+ .addFrameIndex(FI).addImm(0);
+ } else { // move -> load
+ unsigned DstReg = MI->getOperand(0).getReg();
+ if (RI.isPhysicalRegister(DstReg) && !RI.isLowRegister(DstReg))
+ // tRestore cannot target a high register operand.
+ break;
+ bool isDead = MI->getOperand(0).isDead();
+ NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::tRestore))
+ .addReg(DstReg, RegState::Define | getDeadRegState(isDead))
+ .addFrameIndex(FI).addImm(0);
+ }
+ break;
+ }
+ }
+
+ return NewMI;
+}
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