diff options
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 5 | ||||
| -rw-r--r-- | test/Transforms/InstCombine/2008-05-22-NegValVector.ll | 8 |
2 files changed, 13 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index ce5f2397d2..d7f5ccf788 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -550,6 +550,11 @@ static inline Value *dyn_castNegVal(Value *V) { // Constants can be considered to be negated values if they can be folded. if (ConstantInt *C = dyn_cast<ConstantInt>(V)) return ConstantExpr::getNeg(C); + + if (ConstantVector *C = dyn_cast<ConstantVector>(V)) + if (C->getType()->getElementType()->isInteger()) + return ConstantExpr::getNeg(C); + return 0; } diff --git a/test/Transforms/InstCombine/2008-05-22-NegValVector.ll b/test/Transforms/InstCombine/2008-05-22-NegValVector.ll new file mode 100644 index 0000000000..f2511b3832 --- /dev/null +++ b/test/Transforms/InstCombine/2008-05-22-NegValVector.ll @@ -0,0 +1,8 @@ +; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep sub + +define <3 x i8> @f(<3 x i8> %a) { + %A = sub <3 x i8> zeroinitializer, %a + %B = mul <3 x i8> %A, <i8 5, i8 5, i8 5> + ret <3 x i8> %B +} + |