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It's not safe eliminate copies where src and dst have different sub-register indices.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103450 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2010-05-11 00:20:03 +00:00
parent 0bcccac504
commit 31b9c44cc1
4 changed files with 15 additions and 10 deletions
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4
lib/CodeGen/ProcessImplicitDefs.cpp
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@ -46,7 +46,7 @@ bool ProcessImplicitDefs::CanTurnIntoImplicitDef(MachineInstr *MI,
const TargetInstrInfo *tii_) {
unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
if (tii_->isMoveInstr(*MI, SrcReg, DstReg, SrcSubReg, DstSubReg) &&
Reg == SrcReg)
Reg == SrcReg && SrcSubReg == 0 && DstSubReg == 0)
return true;
if (OpIdx == 2 && MI->isSubregToReg())
@ -220,7 +220,7 @@ bool ProcessImplicitDefs::runOnMachineFunction(MachineFunction &fn) {
// Turn a copy use into an implicit_def.
unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
if (tii_->isMoveInstr(*RMI, SrcReg, DstReg, SrcSubReg, DstSubReg) &&
Reg == SrcReg) {
Reg == SrcReg && SrcSubReg == 0 && DstSubReg == 0) {
RMI->setDesc(tii_->get(TargetOpcode::IMPLICIT_DEF));
bool isKill = false;