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If CPSR is modified but the def is dead, then it's ok to fold the load / store.

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llvm-svn: 77182
This commit is contained in:
Evan Cheng 2009-07-27 04:18:04 +00:00
parent 674c4d47b9
commit 657ef082f0
1 changed files with 3 additions and 2 deletions
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5
lib/Target/ARM/ARMBaseInstrInfo.cpp
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@ -681,7 +681,7 @@ foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
MachineInstr *NewMI = NULL;
if (Opc == ARM::MOVr || Opc == ARM::t2MOVr) {
// If it is updating CPSR, then it cannot be folded.
if (MI->getOperand(4).getReg() != ARM::CPSR) {
if (MI->getOperand(4).getReg() != ARM::CPSR || MI->getOperand(4).isDead()) {
unsigned Pred = MI->getOperand(2).getImm();
unsigned PredReg = MI->getOperand(3).getReg();
if (OpNum == 0) { // move -> store
@ -771,6 +771,7 @@ ARMBaseInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
MachineInstr* MI,
const SmallVectorImpl<unsigned> &Ops,
MachineInstr* LoadMI) const {
// FIXME
return 0;
}
@ -782,7 +783,7 @@ ARMBaseInstrInfo::canFoldMemoryOperand(const MachineInstr *MI,
unsigned Opc = MI->getOpcode();
if (Opc == ARM::MOVr || Opc == ARM::t2MOVr) {
// If it is updating CPSR, then it cannot be folded.
return MI->getOperand(4).getReg() != ARM::CPSR;
return MI->getOperand(4).getReg() != ARM::CPSR ||MI->getOperand(4).isDead();
} else if (Opc == ARM::FCPYS || Opc == ARM::FCPYD) {
return true;
} else if (Opc == ARM::VMOVD || Opc == ARM::VMOVQ) {