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Fix a subtle bug in DeadMachineInstructionElim's liveness

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computation. A def of a register doesn't necessarily kill
live super-registers.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57614 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2008-10-16 00:11:23 +00:00
parent a7250ddc28
commit b382c4dc23
1 changed files with 4 additions and 1 deletions
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5
lib/CodeGen/DeadMachineInstructionElim.cpp
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@ -126,7 +126,10 @@ bool DeadMachineInstructionElim::runOnMachineFunction(MachineFunction &MF) {
unsigned Reg = MO.getReg();
if (Reg != 0 && TargetRegisterInfo::isPhysicalRegister(Reg)) {
LivePhysRegs.reset(Reg);
for (const unsigned *AliasSet = TRI->getAliasSet(Reg);
// Check the subreg set, not the alias set, because a def
// of a super-register may still be partially live after
// this def.
for (const unsigned *AliasSet = TRI->getSubRegisters(Reg);
*AliasSet; ++AliasSet)
LivePhysRegs.reset(*AliasSet);
}