diff options
| -rw-r--r-- | lib/Transforms/Utils/Local.cpp | 8 | ||||
| -rw-r--r-- | test/Transforms/DeadStoreElimination/simple.ll | 3 |
2 files changed, 9 insertions, 2 deletions
diff --git a/lib/Transforms/Utils/Local.cpp b/lib/Transforms/Utils/Local.cpp index 7034feb227..134ab71050 100644 --- a/lib/Transforms/Utils/Local.cpp +++ b/lib/Transforms/Utils/Local.cpp @@ -28,6 +28,7 @@ #include "llvm/Analysis/DIBuilder.h" #include "llvm/Analysis/Dominators.h" #include "llvm/Analysis/InstructionSimplify.h" +#include "llvm/Analysis/MemoryBuiltins.h" #include "llvm/Analysis/ProfileInfo.h" #include "llvm/Analysis/ValueTracking.h" #include "llvm/Target/TargetData.h" @@ -257,6 +258,13 @@ bool llvm::isInstructionTriviallyDead(Instruction *I) { II->getIntrinsicID() == Intrinsic::lifetime_end) return isa<UndefValue>(II->getArgOperand(1)); } + + if (extractMallocCall(I)) return true; + + if (CallInst *CI = isFreeCall(I)) + if (Constant *C = dyn_cast<Constant>(CI->getArgOperand(0))) + return C->isNullValue() || isa<UndefValue>(C); + return false; } diff --git a/test/Transforms/DeadStoreElimination/simple.ll b/test/Transforms/DeadStoreElimination/simple.ll index 1703ee961f..81eb5a8c70 100644 --- a/test/Transforms/DeadStoreElimination/simple.ll +++ b/test/Transforms/DeadStoreElimination/simple.ll @@ -257,5 +257,4 @@ define void @test20() { ret void } ; CHECK: @test20 -; CHECK-NOT: store -; CHECK: ret void +; CHECK-NEXT: ret void |