diff options
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 4 | ||||
| -rw-r--r-- | test/Transforms/InstCombine/memcpy.ll | 10 |
2 files changed, 13 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index b9c536f..c7359c4 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -9896,9 +9896,11 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) { Intrinsic::getDeclaration(M, MemCpyID, Tys, 1)); Changed = true; } + } + if (MemTransferInst *MTI = dyn_cast<MemTransferInst>(MI)) { // memmove(x,x,size) -> noop. - if (MMI->getSource() == MMI->getDest()) + if (MTI->getSource() == MTI->getDest()) return EraseInstFromFunction(CI); } diff --git a/test/Transforms/InstCombine/memcpy.ll b/test/Transforms/InstCombine/memcpy.ll new file mode 100644 index 0000000..2e7b2c0 --- /dev/null +++ b/test/Transforms/InstCombine/memcpy.ll @@ -0,0 +1,10 @@ +; RUN: opt < %s -instcombine -S | FileCheck %s + +declare void @llvm.memcpy.i32(i8*, i8*, i32, i32) + +define void @test4(i8* %a) { + tail call void @llvm.memcpy.i32( i8* %a, i8* %a, i32 100, i32 1 ) + ret void +} +; CHECK: define void @test4 +; CHECK-NEXT: ret void |