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Try again to teach getFirstTerminator() about debug values.

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Fix some callers to better deal with debug values.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123419 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-01-14 01:17:53 +00:00
parent c5f608b49c
commit 09befe9036
2 changed files with 24 additions and 7 deletions
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10
lib/CodeGen/PHIElimination.cpp
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@ -339,6 +339,8 @@ void PHIElimination::LowerAtomicPHINode(
#ifndef NDEBUG
for (MachineBasicBlock::iterator TI = llvm::next(Term);
TI != opBlock.end(); ++TI) {
if (TI->isDebugValue())
continue;
assert(!TI->readsRegister(SrcReg) &&
"Terminator instructions cannot use virtual registers unless"
"they are the first terminator in a block!");
@ -347,9 +349,13 @@ void PHIElimination::LowerAtomicPHINode(
} else if (reusedIncoming || !IncomingReg) {
// We may have to rewind a bit if we didn't insert a copy this time.
KillInst = Term;
while (KillInst != opBlock.begin())
if ((--KillInst)->readsRegister(SrcReg))
while (KillInst != opBlock.begin()) {
--KillInst;
if (KillInst->isDebugValue())
continue;
if (KillInst->readsRegister(SrcReg))
break;
}
} else {
// We just inserted this copy.
KillInst = prior(InsertPos);