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It's possible that an all-zero GEP may be used as the argument to lifetime

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intrinsics. In fact, we'll optimize a bitcast to that when possible. Detect it
when looking for the lifetime intrinsics.

No test case, noticed by inspection.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132906 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2011-06-13 07:52:46 +00:00
parent 5e5ed44577
commit 9a488a8317
1 changed files with 6 additions and 2 deletions
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8
lib/Transforms/Utils/InlineFunction.cpp
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@ -734,11 +734,15 @@ static bool hasLifetimeMarkers(AllocaInst *AI) {
if (AI->getType() == Int8PtrTy)
return isUsedByLifetimeMarker(AI);
// Do a scan to find all the bitcasts to i8*.
// Do a scan to find all the bitcasts or GEPs to i8*.
for (Value::use_iterator I = AI->use_begin(), E = AI->use_end(); I != E;
++I) {
if (I->getType() != Int8PtrTy) continue;
if (!isa<BitCastInst>(*I)) continue;
if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(*I)) {
if (!GEPI->hasAllZeroIndices()) continue;
} else if (!isa<BitCastInst>(*I)) {
continue;
}
if (isUsedByLifetimeMarker(*I))
return true;
}