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| -rw-r--r-- | llvm/test/Transforms/InstCombine/shuffle-select-narrow.ll | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/shuffle-select-narrow.ll b/llvm/test/Transforms/InstCombine/shuffle-select-narrow.ll new file mode 100644 index 00000000000..031de813602 --- /dev/null +++ b/llvm/test/Transforms/InstCombine/shuffle-select-narrow.ll @@ -0,0 +1,121 @@ +; NOTE: Assertions have been autogenerated by utils/update_test_checks.py +; RUN: opt < %s -instcombine -S | FileCheck %s + +; TODO: Narrow the select operands to eliminate the existing shuffles and replace a wide select with a narrow select. + +define <2 x i8> @narrow_shuffle_of_select(<2 x i1> %cmp, <4 x i8> %x, <4 x i8> %y) { +; CHECK-LABEL: @narrow_shuffle_of_select( +; CHECK-NEXT: [[TMP1:%.*]] = shufflevector <4 x i8> [[X:%.*]], <4 x i8> undef, <2 x i32> <i32 0, i32 1> +; CHECK-NEXT: [[TMP2:%.*]] = shufflevector <4 x i8> [[Y:%.*]], <4 x i8> undef, <2 x i32> <i32 0, i32 1> +; CHECK-NEXT: [[R:%.*]] = select <2 x i1> [[CMP:%.*]], <2 x i8> [[TMP1]], <2 x i8> [[TMP2]] +; 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 undef, i32 undef> + %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) { +; CHECK-LABEL: @narrow_shuffle_of_select_undefs( +; CHECK-NEXT: [[TMP1:%.*]] = shufflevector <4 x float> [[X:%.*]], <4 x float> undef, <3 x i32> <i32 0, i32 1, i32 undef> +; CHECK-NEXT: [[TMP2:%.*]] = shufflevector <4 x float> [[Y:%.*]], <4 x float> undef, <3 x i32> <i32 0, i32 1, i32 undef> +; CHECK-NEXT: [[R:%.*]] = select <3 x i1> [[CMP:%.*]], <3 x float> [[TMP1]], <3 x float> [[TMP2]] +; CHECK-NEXT: ret <3 x float> [[R]] +; + %widecmp = shufflevector <3 x i1> %cmp, <3 x i1> undef, <4 x i32> <i32 undef, i32 1, i32 2, i32 undef> + %widesel = select <4 x i1> %widecmp, <4 x float> %x, <4 x float> %y + %r = shufflevector <4 x float> %widesel, <4 x float> undef, <3 x i32> <i32 0, i32 1, i32 undef> + ret <3 x float> %r +} + +declare void @use(<4 x i8>) +declare void @use_cmp(<4 x i1>) + +define <2 x i8> @narrow_shuffle_of_select_use1(<2 x i1> %cmp, <4 x i8> %x, <4 x i8> %y) { +; CHECK-LABEL: @narrow_shuffle_of_select_use1( +; CHECK-NEXT: [[WIDECMP:%.*]] = shufflevector <2 x i1> [[CMP:%.*]], <2 x i1> undef, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef> +; 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: call void @use(<4 x i8> [[WIDESEL]]) +; 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 undef, i32 undef> + %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> + call void @use(<4 x i8> %widesel) + ret <2 x i8> %r +} + +define <2 x i8> @narrow_shuffle_of_select_use2(<2 x i1> %cmp, <4 x i8> %x, <4 x i8> %y) { +; CHECK-LABEL: @narrow_shuffle_of_select_use2( +; CHECK-NEXT: [[WIDECMP:%.*]] = shufflevector <2 x i1> [[CMP:%.*]], <2 x i1> undef, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef> +; 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: call void @use_cmp(<4 x i1> [[WIDECMP]]) +; 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 undef, i32 undef> + %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> + call void @use_cmp(<4 x i1> %widecmp) + ret <2 x i8> %r +} + +define <3 x i8> @narrow_shuffle_of_select_mismatch_types1(<2 x i1> %cmp, <4 x i8> %x, <4 x i8> %y) { +; CHECK-LABEL: @narrow_shuffle_of_select_mismatch_types1( +; CHECK-NEXT: [[WIDECMP:%.*]] = shufflevector <2 x i1> [[CMP:%.*]], <2 x i1> undef, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef> +; 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, <3 x i32> <i32 0, i32 1, i32 2> +; CHECK-NEXT: ret <3 x i8> [[R]] +; + %widecmp = shufflevector <2 x i1> %cmp, <2 x i1> undef, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef> + %widesel = select <4 x i1> %widecmp, <4 x i8> %x, <4 x i8> %y + %r = shufflevector <4 x i8> %widesel, <4 x i8> undef, <3 x i32> <i32 0, i32 1, i32 2> + ret <3 x i8> %r +} + +define <3 x i8> @narrow_shuffle_of_select_mismatch_types2(<4 x i1> %cmp, <6 x i8> %x, <6 x i8> %y) { +; CHECK-LABEL: @narrow_shuffle_of_select_mismatch_types2( +; CHECK-NEXT: [[WIDECMP:%.*]] = shufflevector <4 x i1> [[CMP:%.*]], <4 x i1> undef, <6 x i32> <i32 0, i32 1, i32 2, i32 3, i32 undef, i32 undef> +; CHECK-NEXT: [[WIDESEL:%.*]] = select <6 x i1> [[WIDECMP]], <6 x i8> [[X:%.*]], <6 x i8> [[Y:%.*]] +; CHECK-NEXT: [[R:%.*]] = shufflevector <6 x i8> [[WIDESEL]], <6 x i8> undef, <3 x i32> <i32 0, i32 1, i32 2> +; CHECK-NEXT: ret <3 x i8> [[R]] +; + %widecmp = shufflevector <4 x i1> %cmp, <4 x i1> undef, <6 x i32> <i32 0, i32 1, i32 2, i32 3, i32 undef, i32 undef> + %widesel = select <6 x i1> %widecmp, <6 x i8> %x, <6 x i8> %y + %r = shufflevector <6 x i8> %widesel, <6 x i8> undef, <3 x i32> <i32 0, i32 1, i32 2> + ret <3 x i8> %r +} + +; TODO: Narrowing constants does not require creating new narrowing shuffle instructions. + +define <2 x i8> @narrow_shuffle_of_select_consts(<2 x i1> %cmp) { +; CHECK-LABEL: @narrow_shuffle_of_select_consts( +; CHECK-NEXT: [[R:%.*]] = select <2 x i1> [[CMP:%.*]], <2 x i8> <i8 -1, i8 -2>, <2 x i8> <i8 1, i8 2> +; 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 undef, i32 undef> + %widesel = select <4 x i1> %widecmp, <4 x i8> <i8 -1, i8 -2, i8 -3, i8 -4>, <4 x i8> <i8 1, i8 2, i8 3, i8 4> + %r = shufflevector <4 x i8> %widesel, <4 x i8> undef, <2 x i32> <i32 0, i32 1> + ret <2 x i8> %r +} + +; PR38691 - https://bugs.llvm.org/show_bug.cgi?id=38691 +; TODO: If the operands are widened only to be narrowed back, then all of the shuffles are unnecessary. + +define <2 x i8> @narrow_shuffle_of_select_with_widened_ops(<2 x i1> %cmp, <2 x i8> %x, <2 x i8> %y) { +; CHECK-LABEL: @narrow_shuffle_of_select_with_widened_ops( +; CHECK-NEXT: [[R:%.*]] = select <2 x i1> [[CMP:%.*]], <2 x i8> [[X:%.*]], <2 x i8> [[Y:%.*]] +; CHECK-NEXT: ret <2 x i8> [[R]] +; + %widex = shufflevector <2 x i8> %x, <2 x i8> undef, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef> + %widey = shufflevector <2 x i8> %y, <2 x i8> undef, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef> + %widecmp = shufflevector <2 x i1> %cmp, <2 x i1> undef, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef> + %widesel = select <4 x i1> %widecmp, <4 x i8> %widex, <4 x i8> %widey + %r = shufflevector <4 x i8> %widesel, <4 x i8> undef, <2 x i32> <i32 0, i32 1> + ret <2 x i8> %r +} + |
