diff options
Diffstat (limited to 'lib/Transforms/InstCombine/InstCombinePHI.cpp')
| -rw-r--r-- | lib/Transforms/InstCombine/InstCombinePHI.cpp | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/Transforms/InstCombine/InstCombinePHI.cpp b/lib/Transforms/InstCombine/InstCombinePHI.cpp index e82b0d2ab3..664546c165 100644 --- a/lib/Transforms/InstCombine/InstCombinePHI.cpp +++ b/lib/Transforms/InstCombine/InstCombinePHI.cpp @@ -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. |