diff options
| -rw-r--r-- | lib/Transforms/Scalar/DeadStoreElimination.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/DeadStoreElimination.cpp b/lib/Transforms/Scalar/DeadStoreElimination.cpp index 92431c3..8b40da6 100644 --- a/lib/Transforms/Scalar/DeadStoreElimination.cpp +++ b/lib/Transforms/Scalar/DeadStoreElimination.cpp @@ -90,6 +90,11 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) { // If we find a store or a free, get it's memory dependence. if (!isa<StoreInst>(Inst) && !isa<FreeInst>(Inst)) continue; + + // Don't molest volatile stores or do queries that will return "clobber". + if (StoreInst *SI = dyn_cast<StoreInst>(Inst)) + if (SI->isVolatile()) + continue; MemDepResult InstDep = MD.getDependency(Inst); |