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Don't try to replace physical registers when doing CSE.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97360 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-02-28 01:33:43 +00:00
parent 8772f5041c
commit 6ac33b4533
2 changed files with 51 additions and 1 deletions
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13
lib/CodeGen/MachineLICM.cpp
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@@ -458,9 +458,20 @@ bool MachineLICM::EliminateCSE(MachineInstr *MI,
if (const MachineInstr *Dup = LookForDuplicate(MI, CI->second)) {
DEBUG(dbgs() << "CSEing " << *MI << " with " << *Dup);
// Replace virtual registers defined by MI by their counterparts defined
// by Dup.
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = MI->getOperand(i);
if (MO.isReg() && MO.isDef())
// Physical registers may not differ here.
assert((!MO.isReg() || MO.getReg() == 0 ||
!TargetRegisterInfo::isPhysicalRegister(MO.getReg()) ||
MO.getReg() == Dup->getOperand(i).getReg()) &&
"Instructions with different phys regs are not identical!");
if (MO.isReg() && MO.isDef() &&
!TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
RegInfo->replaceRegWith(MO.getReg(), Dup->getOperand(i).getReg());
}
MI->eraseFromParent();