diff options
| -rw-r--r-- | lib/Transforms/Scalar/DeadStoreElimination.cpp | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/lib/Transforms/Scalar/DeadStoreElimination.cpp b/lib/Transforms/Scalar/DeadStoreElimination.cpp index 39a0aba2c9..bcf674ed37 100644 --- a/lib/Transforms/Scalar/DeadStoreElimination.cpp +++ b/lib/Transforms/Scalar/DeadStoreElimination.cpp @@ -287,6 +287,13 @@ bool DSE::handleEndBlock(BasicBlock& BB, deadPointers.erase(A); continue; } else if (CallSite::get(BBI).getInstruction() != 0) { + // If this call does not access memory, it can't + // be undeadifying any of our pointers. + CallSite CS = CallSite::get(BBI); + if (CS.getCalledFunction() && + AA.doesNotAccessMemory(CS.getCalledFunction())) + continue; + // Remove any pointers made undead by the call from the dead set std::vector<Instruction*> dead; for (SmallPtrSet<AllocaInst*, 64>::iterator I = deadPointers.begin(), @@ -298,8 +305,7 @@ bool DSE::handleEndBlock(BasicBlock& BB, TD.getTypeSize((*I)->getAllocatedType()); // See if the call site touches it - AliasAnalysis::ModRefResult A = AA.getModRefInfo(CallSite::get(BBI), - *I, pointerSize); + AliasAnalysis::ModRefResult A = AA.getModRefInfo(CS, *I, pointerSize); if (A == AliasAnalysis::ModRef || A == AliasAnalysis::Ref) dead.push_back(*I); } |