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Fix an anti-dep breaker corner case.

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<rdar://problem/8959122> illegal register operands for UMULL instruction in cfrac nightly test
I'm stil working on a unit test, but the case is:
rx = movcc rx, r3
r2 = ldr
r2, r3 = umull r2, r2

The anti-dep breaker should not convert this into an illegal instruction:
r2, r2 = umull


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124932 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2011-02-05 02:58:46 +00:00
parent a818d031d5
commit 278ba1f9b6
1 changed files with 0 additions and 1 deletions
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lib/CodeGen/CriticalAntiDepBreaker.cpp
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@ -334,7 +334,6 @@ CriticalAntiDepBreaker::isNewRegModifiedByRefs(RegRefIter RegRefBegin,
{
for (RegRefIter I = RegRefBegin; I != RegRefEnd; ++I ) {
MachineOperand *MO = I->second;
if (MO->isDef()) continue;
if (MO->getParent()->modifiesRegister(NewReg, TRI))
return true;
}