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Don't consider instructions with implicit physical register

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defs to be necessarily live.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56310 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2008-09-18 18:22:32 +00:00
parent 6a0fd93547
commit e251b1529f
1 changed files with 2 additions and 1 deletions
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lib/CodeGen/DeadMachineInstructionElim.cpp
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@ -64,7 +64,8 @@ bool DeadMachineInstructionElim::runOnMachineFunction(MachineFunction &MF) {
const MachineOperand &MO = MI->getOperand(i); const MachineOperand &MO = MI->getOperand(i);
if (MO.isRegister() && MO.isDef()) { if (MO.isRegister() && MO.isDef()) {
unsigned Reg = MO.getReg(); unsigned Reg = MO.getReg();
if (TargetRegisterInfo::isPhysicalRegister(Reg) || if ((!MO.isImplicit() &&
TargetRegisterInfo::isPhysicalRegister(Reg)) ||
!MRI.use_empty(Reg)) { !MRI.use_empty(Reg)) {
// This def has a use. Don't delete the instruction! // This def has a use. Don't delete the instruction!
AllDefsDead = false; AllDefsDead = false;