diff options
| -rw-r--r-- | lib/CodeGen/DeadMachineInstructionElim.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/CodeGen/DeadMachineInstructionElim.cpp b/lib/CodeGen/DeadMachineInstructionElim.cpp index 305ec0e..0d043f7 100644 --- a/lib/CodeGen/DeadMachineInstructionElim.cpp +++ b/lib/CodeGen/DeadMachineInstructionElim.cpp @@ -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); } |