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d233f607af
This is a patch that replaces shufflevector and insertelement's placeholder value with poison. Underlying motivation is to fix the semantics of shufflevector with undef mask to return poison instead (D93818) The consensus has been made in the late 2020 via mailing list as well as the thread in https://bugs.llvm.org/show_bug.cgi?id=44185 . This patch is a simple syntactic change to the existing code, hence directly pushed as a commit.
180 lines
7.8 KiB
LLVM
180 lines
7.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -instcombine -S < %s | FileCheck %s
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define <4 x float> @good1(float %arg) {
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; CHECK-LABEL: @good1(
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; CHECK-NEXT: [[T:%.*]] = insertelement <4 x float> undef, float [[ARG:%.*]], i32 0
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; CHECK-NEXT: [[T6:%.*]] = shufflevector <4 x float> [[T]], <4 x float> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: ret <4 x float> [[T6]]
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;
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%t = insertelement <4 x float> undef, float %arg, i32 0
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%t4 = insertelement <4 x float> %t, float %arg, i32 1
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%t5 = insertelement <4 x float> %t4, float %arg, i32 2
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%t6 = insertelement <4 x float> %t5, float %arg, i32 3
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ret <4 x float> %t6
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}
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define <4 x float> @good2(float %arg) {
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; CHECK-LABEL: @good2(
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; CHECK-NEXT: [[TMP1:%.*]] = insertelement <4 x float> poison, float [[ARG:%.*]], i32 0
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; CHECK-NEXT: [[T6:%.*]] = shufflevector <4 x float> [[TMP1]], <4 x float> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: ret <4 x float> [[T6]]
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;
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%t = insertelement <4 x float> undef, float %arg, i32 1
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%t4 = insertelement <4 x float> %t, float %arg, i32 2
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%t5 = insertelement <4 x float> %t4, float %arg, i32 0
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%t6 = insertelement <4 x float> %t5, float %arg, i32 3
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ret <4 x float> %t6
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}
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define <4 x float> @good3(float %arg) {
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; CHECK-LABEL: @good3(
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; CHECK-NEXT: [[T:%.*]] = insertelement <4 x float> poison, float [[ARG:%.*]], i32 0
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; CHECK-NEXT: [[T6:%.*]] = shufflevector <4 x float> [[T]], <4 x float> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: ret <4 x float> [[T6]]
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;
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%t = insertelement <4 x float> zeroinitializer, float %arg, i32 0
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%t4 = insertelement <4 x float> %t, float %arg, i32 1
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%t5 = insertelement <4 x float> %t4, float %arg, i32 2
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%t6 = insertelement <4 x float> %t5, float %arg, i32 3
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ret <4 x float> %t6
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}
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define <4 x float> @good4(float %arg) {
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; CHECK-LABEL: @good4(
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; CHECK-NEXT: [[T:%.*]] = insertelement <4 x float> poison, float [[ARG:%.*]], i32 0
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; CHECK-NEXT: [[TMP1:%.*]] = fadd <4 x float> [[T]], [[T]]
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; CHECK-NEXT: [[T7:%.*]] = shufflevector <4 x float> [[TMP1]], <4 x float> undef, <4 x i32> zeroinitializer
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; CHECK-NEXT: ret <4 x float> [[T7]]
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;
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%t = insertelement <4 x float> zeroinitializer, float %arg, i32 0
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%t4 = insertelement <4 x float> %t, float %arg, i32 1
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%t5 = insertelement <4 x float> %t4, float %arg, i32 2
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%t6 = insertelement <4 x float> %t5, float %arg, i32 3
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%t7 = fadd <4 x float> %t6, %t6
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ret <4 x float> %t7
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}
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define <4 x float> @good5(float %v) {
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; CHECK-LABEL: @good5(
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; CHECK-NEXT: [[INS1:%.*]] = insertelement <4 x float> undef, float [[V:%.*]], i32 0
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; CHECK-NEXT: [[A1:%.*]] = fadd <4 x float> [[INS1]], [[INS1]]
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; CHECK-NEXT: [[INS4:%.*]] = shufflevector <4 x float> [[INS1]], <4 x float> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: [[RES:%.*]] = fadd <4 x float> [[A1]], [[INS4]]
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; CHECK-NEXT: ret <4 x float> [[RES]]
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;
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%ins1 = insertelement <4 x float> undef, float %v, i32 0
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%a1 = fadd <4 x float> %ins1, %ins1
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%ins2 = insertelement<4 x float> %ins1, float %v, i32 1
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%ins3 = insertelement<4 x float> %ins2, float %v, i32 2
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%ins4 = insertelement<4 x float> %ins3, float %v, i32 3
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%res = fadd <4 x float> %a1, %ins4
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ret <4 x float> %res
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}
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; The insert is changed to allow the canonical shuffle-splat pattern from element 0.
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define <4 x float> @splat_undef1(float %arg) {
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; CHECK-LABEL: @splat_undef1(
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; CHECK-NEXT: [[TMP1:%.*]] = insertelement <4 x float> poison, float [[ARG:%.*]], i32 0
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; CHECK-NEXT: [[T6:%.*]] = shufflevector <4 x float> [[TMP1]], <4 x float> poison, <4 x i32> <i32 undef, i32 0, i32 0, i32 0>
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; CHECK-NEXT: ret <4 x float> [[T6]]
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;
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%t = insertelement <4 x float> undef, float %arg, i32 1
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%t4 = insertelement <4 x float> %t, float %arg, i32 1
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%t5 = insertelement <4 x float> %t4, float %arg, i32 2
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%t6 = insertelement <4 x float> %t5, float %arg, i32 3
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ret <4 x float> %t6
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}
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; Re-uses the existing first insertelement.
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define <4 x float> @splat_undef2(float %arg) {
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; CHECK-LABEL: @splat_undef2(
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; CHECK-NEXT: [[T:%.*]] = insertelement <4 x float> undef, float [[ARG:%.*]], i32 0
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; CHECK-NEXT: [[T6:%.*]] = shufflevector <4 x float> [[T]], <4 x float> poison, <4 x i32> <i32 0, i32 undef, i32 0, i32 0>
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; CHECK-NEXT: ret <4 x float> [[T6]]
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;
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%t = insertelement <4 x float> undef, float %arg, i32 0
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%t5 = insertelement <4 x float> %t, float %arg, i32 2
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%t6 = insertelement <4 x float> %t5, float %arg, i32 3
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ret <4 x float> %t6
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}
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define <4 x float> @bad3(float %arg, float %arg2) {
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; CHECK-LABEL: @bad3(
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; CHECK-NEXT: [[T:%.*]] = insertelement <4 x float> undef, float [[ARG:%.*]], i32 0
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; CHECK-NEXT: [[T4:%.*]] = insertelement <4 x float> [[T]], float [[ARG2:%.*]], i32 1
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; CHECK-NEXT: [[T5:%.*]] = insertelement <4 x float> [[T4]], float [[ARG]], i32 2
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; CHECK-NEXT: [[T6:%.*]] = insertelement <4 x float> [[T5]], float [[ARG]], i32 3
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; CHECK-NEXT: ret <4 x float> [[T6]]
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;
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%t = insertelement <4 x float> undef, float %arg, i32 0
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%t4 = insertelement <4 x float> %t, float %arg2, i32 1
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%t5 = insertelement <4 x float> %t4, float %arg, i32 2
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%t6 = insertelement <4 x float> %t5, float %arg, i32 3
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ret <4 x float> %t6
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}
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define <1 x float> @bad4(float %arg) {
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; CHECK-LABEL: @bad4(
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; CHECK-NEXT: [[T:%.*]] = insertelement <1 x float> undef, float [[ARG:%.*]], i32 0
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; CHECK-NEXT: ret <1 x float> [[T]]
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;
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%t = insertelement <1 x float> undef, float %arg, i32 0
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ret <1 x float> %t
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}
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; Multiple undef elements are ok.
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; TODO: Multiple uses triggers the transform at %t4, but we should sink/scalarize/CSE the splats?
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define <4 x float> @splat_undef3(float %arg) {
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; CHECK-LABEL: @splat_undef3(
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; CHECK-NEXT: [[T:%.*]] = insertelement <4 x float> undef, float [[ARG:%.*]], i32 0
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; CHECK-NEXT: [[T4:%.*]] = shufflevector <4 x float> [[T]], <4 x float> poison, <4 x i32> <i32 0, i32 0, i32 undef, i32 undef>
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; CHECK-NEXT: [[T6:%.*]] = shufflevector <4 x float> [[T]], <4 x float> undef, <4 x i32> zeroinitializer
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; CHECK-NEXT: [[T7:%.*]] = fadd <4 x float> [[T6]], [[T4]]
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; CHECK-NEXT: ret <4 x float> [[T7]]
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;
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%t = insertelement <4 x float> undef, float %arg, i32 0
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%t4 = insertelement <4 x float> %t, float %arg, i32 1
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%t5 = insertelement <4 x float> %t4, float %arg, i32 2
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%t6 = insertelement <4 x float> %t5, float %arg, i32 3
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%t7 = fadd <4 x float> %t6, %t4
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ret <4 x float> %t7
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}
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define <4 x float> @bad6(float %arg, i32 %k) {
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; CHECK-LABEL: @bad6(
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; CHECK-NEXT: [[T:%.*]] = insertelement <4 x float> undef, float [[ARG:%.*]], i32 0
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; CHECK-NEXT: [[T4:%.*]] = insertelement <4 x float> [[T]], float [[ARG]], i32 1
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; CHECK-NEXT: [[T5:%.*]] = insertelement <4 x float> [[T4]], float [[ARG]], i32 [[K:%.*]]
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; CHECK-NEXT: [[T6:%.*]] = insertelement <4 x float> [[T5]], float [[ARG]], i32 3
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; CHECK-NEXT: ret <4 x float> [[T6]]
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;
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%t = insertelement <4 x float> undef, float %arg, i32 0
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%t4 = insertelement <4 x float> %t, float %arg, i32 1
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%t5 = insertelement <4 x float> %t4, float %arg, i32 %k
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%t6 = insertelement <4 x float> %t5, float %arg, i32 3
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ret <4 x float> %t6
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}
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define <4 x float> @bad7(float %v) {
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; CHECK-LABEL: @bad7(
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; CHECK-NEXT: [[INS1:%.*]] = insertelement <4 x float> undef, float [[V:%.*]], i32 1
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; CHECK-NEXT: [[A1:%.*]] = fadd <4 x float> [[INS1]], [[INS1]]
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; CHECK-NEXT: [[INS2:%.*]] = insertelement <4 x float> [[INS1]], float [[V]], i32 2
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; CHECK-NEXT: [[INS3:%.*]] = insertelement <4 x float> [[INS2]], float [[V]], i32 3
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; CHECK-NEXT: [[INS4:%.*]] = insertelement <4 x float> [[INS3]], float [[V]], i32 0
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; CHECK-NEXT: [[RES:%.*]] = fadd <4 x float> [[A1]], [[INS4]]
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; CHECK-NEXT: ret <4 x float> [[RES]]
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;
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%ins1 = insertelement <4 x float> undef, float %v, i32 1
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%a1 = fadd <4 x float> %ins1, %ins1
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%ins2 = insertelement<4 x float> %ins1, float %v, i32 2
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%ins3 = insertelement<4 x float> %ins2, float %v, i32 3
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%ins4 = insertelement<4 x float> %ins3, float %v, i32 0
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%res = fadd <4 x float> %a1, %ins4
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ret <4 x float> %res
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}
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