diff options
| -rw-r--r-- | llvm/test/Transforms/InstCombine/shuffle-select-narrow.ll | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/shuffle-select-narrow.ll b/llvm/test/Transforms/InstCombine/shuffle-select-narrow.ll index 38974e2ec6e..51473b2b9e1 100644 --- a/llvm/test/Transforms/InstCombine/shuffle-select-narrow.ll +++ b/llvm/test/Transforms/InstCombine/shuffle-select-narrow.ll @@ -16,6 +16,21 @@ define <2 x i8> @narrow_shuffle_of_select(<2 x i1> %cmp, <4 x i8> %x, <4 x i8> % ret <2 x i8> %r } +; TODO: The 1st shuffle is not extending with undefs, but demanded elements should correct that. + +define <2 x i8> @narrow_shuffle_of_select_overspecified_extend(<2 x i1> %cmp, <4 x i8> %x, <4 x i8> %y) { +; CHECK-LABEL: @narrow_shuffle_of_select_overspecified_extend( +; CHECK-NEXT: [[WIDECMP:%.*]] = shufflevector <2 x i1> [[CMP:%.*]], <2 x i1> undef, <4 x i32> <i32 0, i32 1, i32 0, i32 1> +; CHECK-NEXT: [[WIDESEL:%.*]] = select <4 x i1> [[WIDECMP]], <4 x i8> [[X:%.*]], <4 x i8> [[Y:%.*]] +; CHECK-NEXT: [[R:%.*]] = shufflevector <4 x i8> [[WIDESEL]], <4 x i8> undef, <2 x i32> <i32 0, i32 1> +; CHECK-NEXT: ret <2 x i8> [[R]] +; + %widecmp = shufflevector <2 x i1> %cmp, <2 x i1> undef, <4 x i32> <i32 0, i32 1, i32 0, i32 1> + %widesel = select <4 x i1> %widecmp, <4 x i8> %x, <4 x i8> %y + %r = shufflevector <4 x i8> %widesel, <4 x i8> undef, <2 x i32> <i32 0, i32 1> + ret <2 x i8> %r +} + ; TODO: Verify that undef elements are acceptable for identity shuffle mask. Also check FP types. define <3 x float> @narrow_shuffle_of_select_undefs(<3 x i1> %cmp, <4 x float> %x, <4 x float> %y) { |
