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It's not safe to propagate implicit_def that defines part of a register.

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llvm-svn: 103436
This commit is contained in:
Evan Cheng 2010-05-10 21:25:30 +00:00
parent 040646a78e
commit 119fec2a67
1 changed files with 2 additions and 0 deletions
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2
lib/CodeGen/ProcessImplicitDefs.cpp
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@ -89,6 +89,8 @@ bool ProcessImplicitDefs::runOnMachineFunction(MachineFunction &fn) {
MachineInstr *MI = &*I; MachineInstr *MI = &*I;
++I; ++I;
if (MI->isImplicitDef()) { if (MI->isImplicitDef()) {
if (MI->getOperand(0).getSubReg())
continue;
unsigned Reg = MI->getOperand(0).getReg(); unsigned Reg = MI->getOperand(0).getReg();
ImpDefRegs.insert(Reg); ImpDefRegs.insert(Reg);
if (TargetRegisterInfo::isPhysicalRegister(Reg)) { if (TargetRegisterInfo::isPhysicalRegister(Reg)) {