diff options
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp | 4 | ||||
| -rw-r--r-- | llvm/test/Transforms/InstCombine/vec_shuffle.ll | 8 |
2 files changed, 12 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp b/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp index 70483ceb062..0ba7340e642 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp @@ -930,6 +930,10 @@ Instruction *InstCombiner::visitSelectInst(SelectInst &SI) { Value *V = Builder->CreateShuffleVector(TrueVal, FalseVal, MaskVal); return ReplaceInstUsesWith(SI, V); } + + if (isa<ConstantAggregateZero>(CondVal)) { + return ReplaceInstUsesWith(SI, FalseVal); + } } return 0; diff --git a/llvm/test/Transforms/InstCombine/vec_shuffle.ll b/llvm/test/Transforms/InstCombine/vec_shuffle.ll index a7f9fcfbe0f..14f532195d7 100644 --- a/llvm/test/Transforms/InstCombine/vec_shuffle.ll +++ b/llvm/test/Transforms/InstCombine/vec_shuffle.ll @@ -188,3 +188,11 @@ define <4 x i16> @test13d(<4 x i16> %lhs, <4 x i16> %rhs) { <4 x i16> %lhs, <4 x i16> %rhs ret <4 x i16> %A } + +define <4 x i16> @test13e(<4 x i16> %lhs, <4 x i16> %rhs) { +; CHECK: @test13e +; CHECK-NEXT: ret <4 x i16> %rhs + %A = select <4 x i1> <i1 false, i1 false, i1 false, i1 false>, + <4 x i16> %lhs, <4 x i16> %rhs + ret <4 x i16> %A +} |
