[SLP][NFC]Add a test for correct shuffles order after reordering.

Author: alexey-bataev

llvm/test/Transforms/SLPVectorizer/X86/insert-shuffle.ll

@@ -0,0 +1,67 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -slp-vectorizer -S -o - -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s
+
+%struct.sw = type { float, float, float, float }
+
+define { <2 x float>, <2 x float> } @foo(%struct.sw* %v) {
+; CHECK-LABEL: @foo(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[TMP0:%.*]] = load float, float* undef, align 4
+; CHECK-NEXT:    [[X:%.*]] = getelementptr inbounds [[STRUCT_SW:%.*]], %struct.sw* [[V:%.*]], i64 0, i32 0
+; CHECK-NEXT:    [[Y:%.*]] = getelementptr inbounds [[STRUCT_SW]], %struct.sw* [[V]], i64 0, i32 1
+; CHECK-NEXT:    [[TMP1:%.*]] = bitcast float* [[X]] to <2 x float>*
+; CHECK-NEXT:    [[TMP2:%.*]] = load <2 x float>, <2 x float>* [[TMP1]], align 16
+; CHECK-NEXT:    [[TMP3:%.*]] = load float, float* undef, align 4
+; CHECK-NEXT:    [[TMP4:%.*]] = insertelement <4 x float> <float poison, float undef, float poison, float poison>, float [[TMP0]], i32 0
+; CHECK-NEXT:    [[TMP5:%.*]] = shufflevector <2 x float> [[TMP2]], <2 x float> poison, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef>
+; CHECK-NEXT:    [[TMP6:%.*]] = shufflevector <4 x float> [[TMP4]], <4 x float> [[TMP5]], <4 x i32> <i32 0, i32 1, i32 4, i32 5>
+; CHECK-NEXT:    [[TMP7:%.*]] = shufflevector <2 x float> [[TMP2]], <2 x float> poison, <4 x i32> <i32 1, i32 0, i32 undef, i32 undef>
+; CHECK-NEXT:    [[TMP8:%.*]] = shufflevector <4 x float> poison, <4 x float> [[TMP7]], <4 x i32> <i32 4, i32 5, i32 2, i32 3>
+; CHECK-NEXT:    [[TMP9:%.*]] = insertelement <4 x float> [[TMP8]], float [[TMP3]], i32 2
+; CHECK-NEXT:    [[TMP10:%.*]] = fmul <4 x float> [[TMP6]], [[TMP9]]
+; CHECK-NEXT:    [[TMP11:%.*]] = fadd <4 x float> poison, [[TMP10]]
+; CHECK-NEXT:    [[TMP12:%.*]] = fadd <4 x float> [[TMP11]], poison
+; CHECK-NEXT:    [[TMP13:%.*]] = fadd <4 x float> [[TMP12]], poison
+; CHECK-NEXT:    [[TMP14:%.*]] = extractelement <4 x float> [[TMP13]], i32 0
+; CHECK-NEXT:    [[VEC1:%.*]] = insertelement <2 x float> undef, float [[TMP14]], i32 0
+; CHECK-NEXT:    [[TMP15:%.*]] = extractelement <4 x float> [[TMP13]], i32 1
+; CHECK-NEXT:    [[VEC2:%.*]] = insertelement <2 x float> [[VEC1]], float [[TMP15]], i32 1
+; CHECK-NEXT:    [[TMP16:%.*]] = extractelement <4 x float> [[TMP13]], i32 2
+; CHECK-NEXT:    [[VEC3:%.*]] = insertelement <2 x float> undef, float [[TMP16]], i32 0
+; CHECK-NEXT:    [[TMP17:%.*]] = extractelement <4 x float> [[TMP13]], i32 3
+; CHECK-NEXT:    [[VEC4:%.*]] = insertelement <2 x float> [[VEC3]], float [[TMP17]], i32 1
+; CHECK-NEXT:    [[INS1:%.*]] = insertvalue { <2 x float>, <2 x float> } undef, <2 x float> [[VEC2]], 0
+; CHECK-NEXT:    [[INS2:%.*]] = insertvalue { <2 x float>, <2 x float> } [[INS1]], <2 x float> [[VEC4]], 1
+; CHECK-NEXT:    ret { <2 x float>, <2 x float> } [[INS2]]
+;
+entry:
+  %0 = load float, float* undef, align 4
+  %x = getelementptr inbounds %struct.sw, %struct.sw* %v, i64 0, i32 0
+  %1 = load float, float* %x, align 16
+  %y = getelementptr inbounds %struct.sw, %struct.sw* %v, i64 0, i32 1
+  %2 = load float, float* %y, align 4
+  %mul3 = fmul float %0, %2
+  %add = fadd float undef, %mul3
+  %add6 = fadd float %add, undef
+  %add9 = fadd float %add6, undef
+  %mul12 = fmul float %1, undef
+  %add16 = fadd float %mul12, undef
+  %add20 = fadd float undef, %add16
+  %add24 = fadd float undef, %add20
+  %3 = load float, float* undef, align 4
+  %mul27 = fmul float %1, %3
+  %add31 = fadd float %mul27, undef
+  %add35 = fadd float undef, %add31
+  %add39 = fadd float undef, %add35
+  %mul45 = fmul float %2, undef
+  %add46 = fadd float undef, %mul45
+  %add50 = fadd float undef, %add46
+  %add54 = fadd float undef, %add50
+  %vec1 = insertelement <2 x float> undef, float %add9, i32 0
+  %vec2 = insertelement <2 x float> %vec1, float %add24, i32 1
+  %vec3 = insertelement <2 x float> undef, float %add39, i32 0
+  %vec4 = insertelement <2 x float> %vec3, float %add54, i32 1
+  %ins1 = insertvalue { <2 x float>, <2 x float> } undef, <2 x float> %vec2, 0
+  %ins2 = insertvalue { <2 x float>, <2 x float> } %ins1, <2 x float> %vec4, 1
+  ret { <2 x float>, <2 x float> } %ins2
+}