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Update instcombine for atomic load/store.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137664 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2011-08-15 22:09:40 +00:00
parent d0b5a5ece4
commit cc4a0435b7
4 changed files with 54 additions and 31 deletions
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7
lib/Transforms/InstCombine/InstCombinePHI.cpp
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@ -286,7 +286,12 @@ static bool isSafeAndProfitableToSinkLoad(LoadInst *L) {
Instruction *InstCombiner::FoldPHIArgLoadIntoPHI(PHINode &PN) {
LoadInst *FirstLI = cast<LoadInst>(PN.getIncomingValue(0));
// FIXME: This is overconservative; this transform is allowed in some cases
// for atomic operations.
if (FirstLI->isAtomic())
return 0;
// When processing loads, we need to propagate two bits of information to the
// sunk load: whether it is volatile, and what its alignment is. We currently
// don't sink loads when some have their alignment specified and some don't.