diff options
Diffstat (limited to 'llvm/lib/Transforms/Scalar')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/InstructionCombining.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp index 20204154d0e..8c2dc3e92f4 100644 --- a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp @@ -9131,6 +9131,10 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) { CI.setOperand(0, Intrinsic::getDeclaration(M, MemCpyID)); Changed = true; } + + // memmove(x,x,size) -> noop. + if (MMI->getSource() == MMI->getDest()) + return EraseInstFromFunction(CI); } // If we can determine a pointer alignment that is bigger than currently |
