diff options
| -rw-r--r-- | lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp b/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp index 35c1d91d50..f233ca6af1 100644 --- a/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp +++ b/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp @@ -429,9 +429,19 @@ Instruction *InstCombiner::visitStoreInst(StoreInst &SI) { // the pointer we're loading and is producing the pointer we're storing, // then *this* store is dead (X = load P; store X -> P). if (LoadInst *LI = dyn_cast<LoadInst>(BBI)) { - if (LI == Val && equivalentAddressValues(LI->getOperand(0), Ptr) && - !SI.isVolatile()) - return EraseInstFromFunction(SI); + if (equivalentAddressValues(LI->getOperand(0), Ptr) && + !SI.isVolatile()) { + if (LI == Val) + return EraseInstFromFunction(SI); + if (Ptr->hasNUses(2)) { + if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Ptr)) { + if (isa<AllocaInst>(GEP->getOperand(0))) { + if (GEP->getOperand(0)->hasOneUse()) + return EraseInstFromFunction(SI); + } + } + } + } // Otherwise, this is a load from some other location. Stores before it // may not be dead. |