mirror of
https://github.com/c64scene-ar/llvm-6502.git
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8239daf7c8
1. Fix pre-ra scheduler so it doesn't try to push instructions above calls to "optimize for latency". Call instructions don't have the right latency and this is more likely to use introduce spills. 2. Fix if-converter cost function. For ARM, it should use instruction latencies, not # of micro-ops since multi-latency instructions is completely executed even when the predicate is false. Also, some instruction will be "slower" when they are predicated due to the register def becoming implicit input. rdar://8598427 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118135 91177308-0d34-0410-b5e6-96231b3b80d8
623 lines
20 KiB
C++
623 lines
20 KiB
C++
//===- Thumb2InstrInfo.cpp - Thumb-2 Instruction Information ----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the Thumb-2 implementation of the TargetInstrInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "Thumb2InstrInfo.h"
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#include "ARM.h"
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#include "ARMConstantPoolValue.h"
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#include "ARMAddressingModes.h"
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#include "ARMGenInstrInfo.inc"
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#include "ARMMachineFunctionInfo.h"
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#include "Thumb2HazardRecognizer.h"
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#include "Thumb2InstrInfo.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineMemOperand.h"
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#include "llvm/CodeGen/PseudoSourceValue.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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static cl::opt<bool>
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OldT2IfCvt("old-thumb2-ifcvt", cl::Hidden,
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cl::desc("Use old-style Thumb2 if-conversion heuristics"),
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cl::init(false));
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Thumb2InstrInfo::Thumb2InstrInfo(const ARMSubtarget &STI)
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: ARMBaseInstrInfo(STI), RI(*this, STI) {
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}
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unsigned Thumb2InstrInfo::getUnindexedOpcode(unsigned Opc) const {
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// FIXME
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return 0;
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}
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void
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Thumb2InstrInfo::ReplaceTailWithBranchTo(MachineBasicBlock::iterator Tail,
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MachineBasicBlock *NewDest) const {
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MachineBasicBlock *MBB = Tail->getParent();
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ARMFunctionInfo *AFI = MBB->getParent()->getInfo<ARMFunctionInfo>();
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if (!AFI->hasITBlocks()) {
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TargetInstrInfoImpl::ReplaceTailWithBranchTo(Tail, NewDest);
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return;
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}
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// If the first instruction of Tail is predicated, we may have to update
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// the IT instruction.
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unsigned PredReg = 0;
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ARMCC::CondCodes CC = llvm::getInstrPredicate(Tail, PredReg);
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MachineBasicBlock::iterator MBBI = Tail;
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if (CC != ARMCC::AL)
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// Expecting at least the t2IT instruction before it.
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--MBBI;
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// Actually replace the tail.
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TargetInstrInfoImpl::ReplaceTailWithBranchTo(Tail, NewDest);
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// Fix up IT.
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if (CC != ARMCC::AL) {
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MachineBasicBlock::iterator E = MBB->begin();
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unsigned Count = 4; // At most 4 instructions in an IT block.
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while (Count && MBBI != E) {
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if (MBBI->isDebugValue()) {
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--MBBI;
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continue;
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}
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if (MBBI->getOpcode() == ARM::t2IT) {
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unsigned Mask = MBBI->getOperand(1).getImm();
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if (Count == 4)
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MBBI->eraseFromParent();
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else {
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unsigned MaskOn = 1 << Count;
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unsigned MaskOff = ~(MaskOn - 1);
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MBBI->getOperand(1).setImm((Mask & MaskOff) | MaskOn);
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}
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return;
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}
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--MBBI;
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--Count;
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}
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// Ctrl flow can reach here if branch folding is run before IT block
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// formation pass.
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}
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}
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bool
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Thumb2InstrInfo::isLegalToSplitMBBAt(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI) const {
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unsigned PredReg = 0;
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return llvm::getITInstrPredicate(MBBI, PredReg) == ARMCC::AL;
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}
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void Thumb2InstrInfo::copyPhysReg(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I, DebugLoc DL,
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unsigned DestReg, unsigned SrcReg,
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bool KillSrc) const {
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// Handle SPR, DPR, and QPR copies.
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if (!ARM::GPRRegClass.contains(DestReg, SrcReg))
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return ARMBaseInstrInfo::copyPhysReg(MBB, I, DL, DestReg, SrcReg, KillSrc);
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bool tDest = ARM::tGPRRegClass.contains(DestReg);
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bool tSrc = ARM::tGPRRegClass.contains(SrcReg);
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unsigned Opc = ARM::tMOVgpr2gpr;
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if (tDest && tSrc)
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Opc = ARM::tMOVr;
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else if (tSrc)
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Opc = ARM::tMOVtgpr2gpr;
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else if (tDest)
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Opc = ARM::tMOVgpr2tgpr;
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BuildMI(MBB, I, DL, get(Opc), DestReg)
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.addReg(SrcReg, getKillRegState(KillSrc));
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}
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void Thumb2InstrInfo::
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storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
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unsigned SrcReg, bool isKill, int FI,
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const TargetRegisterClass *RC,
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const TargetRegisterInfo *TRI) const {
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if (RC == ARM::GPRRegisterClass || RC == ARM::tGPRRegisterClass ||
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RC == ARM::tcGPRRegisterClass || RC == ARM::rGPRRegisterClass) {
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DebugLoc DL;
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if (I != MBB.end()) DL = I->getDebugLoc();
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MachineFunction &MF = *MBB.getParent();
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MachineFrameInfo &MFI = *MF.getFrameInfo();
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MachineMemOperand *MMO =
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MF.getMachineMemOperand(
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MachinePointerInfo(PseudoSourceValue::getFixedStack(FI)),
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MachineMemOperand::MOStore,
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MFI.getObjectSize(FI),
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MFI.getObjectAlignment(FI));
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AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::t2STRi12))
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.addReg(SrcReg, getKillRegState(isKill))
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.addFrameIndex(FI).addImm(0).addMemOperand(MMO));
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return;
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}
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ARMBaseInstrInfo::storeRegToStackSlot(MBB, I, SrcReg, isKill, FI, RC, TRI);
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}
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void Thumb2InstrInfo::
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loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
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unsigned DestReg, int FI,
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const TargetRegisterClass *RC,
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const TargetRegisterInfo *TRI) const {
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if (RC == ARM::GPRRegisterClass || RC == ARM::tGPRRegisterClass ||
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RC == ARM::tcGPRRegisterClass || RC == ARM::rGPRRegisterClass) {
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DebugLoc DL;
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if (I != MBB.end()) DL = I->getDebugLoc();
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MachineFunction &MF = *MBB.getParent();
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MachineFrameInfo &MFI = *MF.getFrameInfo();
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MachineMemOperand *MMO =
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MF.getMachineMemOperand(
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MachinePointerInfo(PseudoSourceValue::getFixedStack(FI)),
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MachineMemOperand::MOLoad,
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MFI.getObjectSize(FI),
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MFI.getObjectAlignment(FI));
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AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::t2LDRi12), DestReg)
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.addFrameIndex(FI).addImm(0).addMemOperand(MMO));
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return;
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}
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ARMBaseInstrInfo::loadRegFromStackSlot(MBB, I, DestReg, FI, RC, TRI);
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}
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ScheduleHazardRecognizer *Thumb2InstrInfo::
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CreateTargetPostRAHazardRecognizer(const InstrItineraryData *II) const {
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return (ScheduleHazardRecognizer *)new Thumb2HazardRecognizer(II);
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}
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void llvm::emitT2RegPlusImmediate(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator &MBBI, DebugLoc dl,
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unsigned DestReg, unsigned BaseReg, int NumBytes,
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ARMCC::CondCodes Pred, unsigned PredReg,
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const ARMBaseInstrInfo &TII) {
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bool isSub = NumBytes < 0;
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if (isSub) NumBytes = -NumBytes;
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// If profitable, use a movw or movt to materialize the offset.
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// FIXME: Use the scavenger to grab a scratch register.
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if (DestReg != ARM::SP && DestReg != BaseReg &&
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NumBytes >= 4096 &&
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ARM_AM::getT2SOImmVal(NumBytes) == -1) {
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bool Fits = false;
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if (NumBytes < 65536) {
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// Use a movw to materialize the 16-bit constant.
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BuildMI(MBB, MBBI, dl, TII.get(ARM::t2MOVi16), DestReg)
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.addImm(NumBytes)
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.addImm((unsigned)Pred).addReg(PredReg);
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Fits = true;
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} else if ((NumBytes & 0xffff) == 0) {
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// Use a movt to materialize the 32-bit constant.
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BuildMI(MBB, MBBI, dl, TII.get(ARM::t2MOVTi16), DestReg)
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.addReg(DestReg)
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.addImm(NumBytes >> 16)
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.addImm((unsigned)Pred).addReg(PredReg);
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Fits = true;
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}
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if (Fits) {
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if (isSub) {
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BuildMI(MBB, MBBI, dl, TII.get(ARM::t2SUBrr), DestReg)
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.addReg(BaseReg, RegState::Kill)
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.addReg(DestReg, RegState::Kill)
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.addImm((unsigned)Pred).addReg(PredReg).addReg(0);
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} else {
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BuildMI(MBB, MBBI, dl, TII.get(ARM::t2ADDrr), DestReg)
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.addReg(DestReg, RegState::Kill)
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.addReg(BaseReg, RegState::Kill)
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.addImm((unsigned)Pred).addReg(PredReg).addReg(0);
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}
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return;
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}
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}
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while (NumBytes) {
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unsigned ThisVal = NumBytes;
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unsigned Opc = 0;
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if (DestReg == ARM::SP && BaseReg != ARM::SP) {
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// mov sp, rn. Note t2MOVr cannot be used.
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BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVgpr2gpr),DestReg).addReg(BaseReg);
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BaseReg = ARM::SP;
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continue;
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}
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bool HasCCOut = true;
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if (BaseReg == ARM::SP) {
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// sub sp, sp, #imm7
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if (DestReg == ARM::SP && (ThisVal < ((1 << 7)-1) * 4)) {
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assert((ThisVal & 3) == 0 && "Stack update is not multiple of 4?");
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Opc = isSub ? ARM::tSUBspi : ARM::tADDspi;
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// FIXME: Fix Thumb1 immediate encoding.
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BuildMI(MBB, MBBI, dl, TII.get(Opc), DestReg)
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.addReg(BaseReg).addImm(ThisVal/4);
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NumBytes = 0;
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continue;
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}
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// sub rd, sp, so_imm
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Opc = isSub ? ARM::t2SUBrSPi : ARM::t2ADDrSPi;
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if (ARM_AM::getT2SOImmVal(NumBytes) != -1) {
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NumBytes = 0;
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} else {
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// FIXME: Move this to ARMAddressingModes.h?
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unsigned RotAmt = CountLeadingZeros_32(ThisVal);
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ThisVal = ThisVal & ARM_AM::rotr32(0xff000000U, RotAmt);
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NumBytes &= ~ThisVal;
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assert(ARM_AM::getT2SOImmVal(ThisVal) != -1 &&
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"Bit extraction didn't work?");
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}
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} else {
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assert(DestReg != ARM::SP && BaseReg != ARM::SP);
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Opc = isSub ? ARM::t2SUBri : ARM::t2ADDri;
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if (ARM_AM::getT2SOImmVal(NumBytes) != -1) {
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NumBytes = 0;
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} else if (ThisVal < 4096) {
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Opc = isSub ? ARM::t2SUBri12 : ARM::t2ADDri12;
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HasCCOut = false;
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NumBytes = 0;
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} else {
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// FIXME: Move this to ARMAddressingModes.h?
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unsigned RotAmt = CountLeadingZeros_32(ThisVal);
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ThisVal = ThisVal & ARM_AM::rotr32(0xff000000U, RotAmt);
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NumBytes &= ~ThisVal;
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assert(ARM_AM::getT2SOImmVal(ThisVal) != -1 &&
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"Bit extraction didn't work?");
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}
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}
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// Build the new ADD / SUB.
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MachineInstrBuilder MIB =
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AddDefaultPred(BuildMI(MBB, MBBI, dl, TII.get(Opc), DestReg)
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.addReg(BaseReg, RegState::Kill)
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.addImm(ThisVal));
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if (HasCCOut)
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AddDefaultCC(MIB);
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BaseReg = DestReg;
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}
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}
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static unsigned
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negativeOffsetOpcode(unsigned opcode)
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{
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switch (opcode) {
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case ARM::t2LDRi12: return ARM::t2LDRi8;
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case ARM::t2LDRHi12: return ARM::t2LDRHi8;
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case ARM::t2LDRBi12: return ARM::t2LDRBi8;
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case ARM::t2LDRSHi12: return ARM::t2LDRSHi8;
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case ARM::t2LDRSBi12: return ARM::t2LDRSBi8;
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case ARM::t2STRi12: return ARM::t2STRi8;
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case ARM::t2STRBi12: return ARM::t2STRBi8;
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case ARM::t2STRHi12: return ARM::t2STRHi8;
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case ARM::t2LDRi8:
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case ARM::t2LDRHi8:
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case ARM::t2LDRBi8:
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case ARM::t2LDRSHi8:
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case ARM::t2LDRSBi8:
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case ARM::t2STRi8:
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case ARM::t2STRBi8:
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case ARM::t2STRHi8:
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return opcode;
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default:
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break;
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}
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return 0;
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}
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static unsigned
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positiveOffsetOpcode(unsigned opcode)
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{
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switch (opcode) {
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case ARM::t2LDRi8: return ARM::t2LDRi12;
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case ARM::t2LDRHi8: return ARM::t2LDRHi12;
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case ARM::t2LDRBi8: return ARM::t2LDRBi12;
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case ARM::t2LDRSHi8: return ARM::t2LDRSHi12;
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case ARM::t2LDRSBi8: return ARM::t2LDRSBi12;
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case ARM::t2STRi8: return ARM::t2STRi12;
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case ARM::t2STRBi8: return ARM::t2STRBi12;
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case ARM::t2STRHi8: return ARM::t2STRHi12;
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case ARM::t2LDRi12:
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case ARM::t2LDRHi12:
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case ARM::t2LDRBi12:
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case ARM::t2LDRSHi12:
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case ARM::t2LDRSBi12:
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case ARM::t2STRi12:
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case ARM::t2STRBi12:
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case ARM::t2STRHi12:
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return opcode;
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default:
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break;
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}
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return 0;
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}
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static unsigned
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immediateOffsetOpcode(unsigned opcode)
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{
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switch (opcode) {
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case ARM::t2LDRs: return ARM::t2LDRi12;
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case ARM::t2LDRHs: return ARM::t2LDRHi12;
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case ARM::t2LDRBs: return ARM::t2LDRBi12;
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case ARM::t2LDRSHs: return ARM::t2LDRSHi12;
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case ARM::t2LDRSBs: return ARM::t2LDRSBi12;
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case ARM::t2STRs: return ARM::t2STRi12;
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case ARM::t2STRBs: return ARM::t2STRBi12;
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case ARM::t2STRHs: return ARM::t2STRHi12;
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case ARM::t2LDRi12:
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case ARM::t2LDRHi12:
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case ARM::t2LDRBi12:
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case ARM::t2LDRSHi12:
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case ARM::t2LDRSBi12:
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case ARM::t2STRi12:
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case ARM::t2STRBi12:
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case ARM::t2STRHi12:
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case ARM::t2LDRi8:
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case ARM::t2LDRHi8:
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case ARM::t2LDRBi8:
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case ARM::t2LDRSHi8:
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case ARM::t2LDRSBi8:
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case ARM::t2STRi8:
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case ARM::t2STRBi8:
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case ARM::t2STRHi8:
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return opcode;
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default:
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break;
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}
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return 0;
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}
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bool llvm::rewriteT2FrameIndex(MachineInstr &MI, unsigned FrameRegIdx,
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unsigned FrameReg, int &Offset,
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const ARMBaseInstrInfo &TII) {
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unsigned Opcode = MI.getOpcode();
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const TargetInstrDesc &Desc = MI.getDesc();
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unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask);
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bool isSub = false;
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// Memory operands in inline assembly always use AddrModeT2_i12.
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if (Opcode == ARM::INLINEASM)
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AddrMode = ARMII::AddrModeT2_i12; // FIXME. mode for thumb2?
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if (Opcode == ARM::t2ADDri || Opcode == ARM::t2ADDri12) {
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Offset += MI.getOperand(FrameRegIdx+1).getImm();
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unsigned PredReg;
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if (Offset == 0 && getInstrPredicate(&MI, PredReg) == ARMCC::AL) {
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// Turn it into a move.
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MI.setDesc(TII.get(ARM::tMOVgpr2gpr));
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MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
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// Remove offset and remaining explicit predicate operands.
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do MI.RemoveOperand(FrameRegIdx+1);
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while (MI.getNumOperands() > FrameRegIdx+1 &&
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(!MI.getOperand(FrameRegIdx+1).isReg() ||
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!MI.getOperand(FrameRegIdx+1).isImm()));
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return true;
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}
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bool isSP = FrameReg == ARM::SP;
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bool HasCCOut = Opcode != ARM::t2ADDri12;
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if (Offset < 0) {
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Offset = -Offset;
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isSub = true;
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MI.setDesc(TII.get(isSP ? ARM::t2SUBrSPi : ARM::t2SUBri));
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} else {
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MI.setDesc(TII.get(isSP ? ARM::t2ADDrSPi : ARM::t2ADDri));
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}
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// Common case: small offset, fits into instruction.
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if (ARM_AM::getT2SOImmVal(Offset) != -1) {
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MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
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MI.getOperand(FrameRegIdx+1).ChangeToImmediate(Offset);
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// Add cc_out operand if the original instruction did not have one.
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if (!HasCCOut)
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MI.addOperand(MachineOperand::CreateReg(0, false));
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Offset = 0;
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return true;
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}
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// Another common case: imm12.
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if (Offset < 4096 &&
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(!HasCCOut || MI.getOperand(MI.getNumOperands()-1).getReg() == 0)) {
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unsigned NewOpc = isSP
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? (isSub ? ARM::t2SUBrSPi12 : ARM::t2ADDrSPi12)
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: (isSub ? ARM::t2SUBri12 : ARM::t2ADDri12);
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MI.setDesc(TII.get(NewOpc));
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MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
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MI.getOperand(FrameRegIdx+1).ChangeToImmediate(Offset);
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// Remove the cc_out operand.
|
|
if (HasCCOut)
|
|
MI.RemoveOperand(MI.getNumOperands()-1);
|
|
Offset = 0;
|
|
return true;
|
|
}
|
|
|
|
// Otherwise, extract 8 adjacent bits from the immediate into this
|
|
// t2ADDri/t2SUBri.
|
|
unsigned RotAmt = CountLeadingZeros_32(Offset);
|
|
unsigned ThisImmVal = Offset & ARM_AM::rotr32(0xff000000U, RotAmt);
|
|
|
|
// We will handle these bits from offset, clear them.
|
|
Offset &= ~ThisImmVal;
|
|
|
|
assert(ARM_AM::getT2SOImmVal(ThisImmVal) != -1 &&
|
|
"Bit extraction didn't work?");
|
|
MI.getOperand(FrameRegIdx+1).ChangeToImmediate(ThisImmVal);
|
|
// Add cc_out operand if the original instruction did not have one.
|
|
if (!HasCCOut)
|
|
MI.addOperand(MachineOperand::CreateReg(0, false));
|
|
|
|
} else {
|
|
|
|
// AddrMode4 and AddrMode6 cannot handle any offset.
|
|
if (AddrMode == ARMII::AddrMode4 || AddrMode == ARMII::AddrMode6)
|
|
return false;
|
|
|
|
// AddrModeT2_so cannot handle any offset. If there is no offset
|
|
// register then we change to an immediate version.
|
|
unsigned NewOpc = Opcode;
|
|
if (AddrMode == ARMII::AddrModeT2_so) {
|
|
unsigned OffsetReg = MI.getOperand(FrameRegIdx+1).getReg();
|
|
if (OffsetReg != 0) {
|
|
MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
|
|
return Offset == 0;
|
|
}
|
|
|
|
MI.RemoveOperand(FrameRegIdx+1);
|
|
MI.getOperand(FrameRegIdx+1).ChangeToImmediate(0);
|
|
NewOpc = immediateOffsetOpcode(Opcode);
|
|
AddrMode = ARMII::AddrModeT2_i12;
|
|
}
|
|
|
|
unsigned NumBits = 0;
|
|
unsigned Scale = 1;
|
|
if (AddrMode == ARMII::AddrModeT2_i8 || AddrMode == ARMII::AddrModeT2_i12) {
|
|
// i8 supports only negative, and i12 supports only positive, so
|
|
// based on Offset sign convert Opcode to the appropriate
|
|
// instruction
|
|
Offset += MI.getOperand(FrameRegIdx+1).getImm();
|
|
if (Offset < 0) {
|
|
NewOpc = negativeOffsetOpcode(Opcode);
|
|
NumBits = 8;
|
|
isSub = true;
|
|
Offset = -Offset;
|
|
} else {
|
|
NewOpc = positiveOffsetOpcode(Opcode);
|
|
NumBits = 12;
|
|
}
|
|
} else if (AddrMode == ARMII::AddrMode5) {
|
|
// VFP address mode.
|
|
const MachineOperand &OffOp = MI.getOperand(FrameRegIdx+1);
|
|
int InstrOffs = ARM_AM::getAM5Offset(OffOp.getImm());
|
|
if (ARM_AM::getAM5Op(OffOp.getImm()) == ARM_AM::sub)
|
|
InstrOffs *= -1;
|
|
NumBits = 8;
|
|
Scale = 4;
|
|
Offset += InstrOffs * 4;
|
|
assert((Offset & (Scale-1)) == 0 && "Can't encode this offset!");
|
|
if (Offset < 0) {
|
|
Offset = -Offset;
|
|
isSub = true;
|
|
}
|
|
} else {
|
|
llvm_unreachable("Unsupported addressing mode!");
|
|
}
|
|
|
|
if (NewOpc != Opcode)
|
|
MI.setDesc(TII.get(NewOpc));
|
|
|
|
MachineOperand &ImmOp = MI.getOperand(FrameRegIdx+1);
|
|
|
|
// Attempt to fold address computation
|
|
// Common case: small offset, fits into instruction.
|
|
int ImmedOffset = Offset / Scale;
|
|
unsigned Mask = (1 << NumBits) - 1;
|
|
if ((unsigned)Offset <= Mask * Scale) {
|
|
// Replace the FrameIndex with fp/sp
|
|
MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
|
|
if (isSub) {
|
|
if (AddrMode == ARMII::AddrMode5)
|
|
// FIXME: Not consistent.
|
|
ImmedOffset |= 1 << NumBits;
|
|
else
|
|
ImmedOffset = -ImmedOffset;
|
|
}
|
|
ImmOp.ChangeToImmediate(ImmedOffset);
|
|
Offset = 0;
|
|
return true;
|
|
}
|
|
|
|
// Otherwise, offset doesn't fit. Pull in what we can to simplify
|
|
ImmedOffset = ImmedOffset & Mask;
|
|
if (isSub) {
|
|
if (AddrMode == ARMII::AddrMode5)
|
|
// FIXME: Not consistent.
|
|
ImmedOffset |= 1 << NumBits;
|
|
else {
|
|
ImmedOffset = -ImmedOffset;
|
|
if (ImmedOffset == 0)
|
|
// Change the opcode back if the encoded offset is zero.
|
|
MI.setDesc(TII.get(positiveOffsetOpcode(NewOpc)));
|
|
}
|
|
}
|
|
ImmOp.ChangeToImmediate(ImmedOffset);
|
|
Offset &= ~(Mask*Scale);
|
|
}
|
|
|
|
Offset = (isSub) ? -Offset : Offset;
|
|
return Offset == 0;
|
|
}
|
|
|
|
/// scheduleTwoAddrSource - Schedule the copy / re-mat of the source of the
|
|
/// two-addrss instruction inserted by two-address pass.
|
|
void
|
|
Thumb2InstrInfo::scheduleTwoAddrSource(MachineInstr *SrcMI,
|
|
MachineInstr *UseMI,
|
|
const TargetRegisterInfo &TRI) const {
|
|
if (SrcMI->getOpcode() != ARM::tMOVgpr2gpr ||
|
|
SrcMI->getOperand(1).isKill())
|
|
return;
|
|
|
|
unsigned PredReg = 0;
|
|
ARMCC::CondCodes CC = llvm::getInstrPredicate(UseMI, PredReg);
|
|
if (CC == ARMCC::AL || PredReg != ARM::CPSR)
|
|
return;
|
|
|
|
// Schedule the copy so it doesn't come between previous instructions
|
|
// and UseMI which can form an IT block.
|
|
unsigned SrcReg = SrcMI->getOperand(1).getReg();
|
|
ARMCC::CondCodes OCC = ARMCC::getOppositeCondition(CC);
|
|
MachineBasicBlock *MBB = UseMI->getParent();
|
|
MachineBasicBlock::iterator MBBI = SrcMI;
|
|
unsigned NumInsts = 0;
|
|
while (--MBBI != MBB->begin()) {
|
|
if (MBBI->isDebugValue())
|
|
continue;
|
|
|
|
MachineInstr *NMI = &*MBBI;
|
|
ARMCC::CondCodes NCC = llvm::getInstrPredicate(NMI, PredReg);
|
|
if (!(NCC == CC || NCC == OCC) ||
|
|
NMI->modifiesRegister(SrcReg, &TRI) ||
|
|
NMI->definesRegister(ARM::CPSR))
|
|
break;
|
|
if (++NumInsts == 4)
|
|
// Too many in a row!
|
|
return;
|
|
}
|
|
|
|
if (NumInsts) {
|
|
MBB->remove(SrcMI);
|
|
MBB->insert(++MBBI, SrcMI);
|
|
}
|
|
}
|
|
|
|
ARMCC::CondCodes
|
|
llvm::getITInstrPredicate(const MachineInstr *MI, unsigned &PredReg) {
|
|
unsigned Opc = MI->getOpcode();
|
|
if (Opc == ARM::tBcc || Opc == ARM::t2Bcc)
|
|
return ARMCC::AL;
|
|
return llvm::getInstrPredicate(MI, PredReg);
|
|
}
|