[PhaseOrdering][X86] Add additional test coverage for llvm#49736

I've kept the old PR50392 tag since this is such an old issue....

Author: RKSimon

llvm/test/Transforms/PhaseOrdering/X86/pr50392.ll

@@ -0,0 +1,64 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -mtriple=x86_64-- -mcpu=x86-64    -O3                   -S < %s  | FileCheck %s --check-prefixes=SSE
+; RUN: opt -mtriple=x86_64-- -mcpu=x86-64-v2 -O3                   -S < %s  | FileCheck %s --check-prefixes=SSE
+; RUN: opt -mtriple=x86_64-- -mcpu=btver2    -O3                   -S < %s  | FileCheck %s --check-prefixes=AVX,AVX1
+; RUN: opt -mtriple=x86_64-- -mcpu=x86-64-v3 -O3                   -S < %s  | FileCheck %s --check-prefixes=AVX,AVX2
+; RUN: opt -mtriple=x86_64-- -mcpu=x86-64    -passes="default<O3>" -S < %s  | FileCheck %s --check-prefixes=SSE
+; RUN: opt -mtriple=x86_64-- -mcpu=x86-64-v2 -passes="default<O3>" -S < %s  | FileCheck %s --check-prefixes=SSE
+; RUN: opt -mtriple=x86_64-- -mcpu=btver2    -passes="default<O3>" -S < %s  | FileCheck %s --check-prefixes=AVX,AVX1
+; RUN: opt -mtriple=x86_64-- -mcpu=x86-64-v3 -passes="default<O3>" -S < %s  | FileCheck %s --check-prefixes=AVX,AVX2
+
+define <4 x double> @PR50392(<4 x double> %a, <4 x double> %b) {
+; SSE-LABEL: @PR50392(
+; SSE-NEXT:    [[TMP1:%.*]] = shufflevector <4 x double> [[A:%.*]], <4 x double> [[B:%.*]], <2 x i32> <i32 0, i32 4>
+; SSE-NEXT:    [[TMP2:%.*]] = shufflevector <4 x double> [[A]], <4 x double> [[B]], <2 x i32> <i32 1, i32 5>
+; SSE-NEXT:    [[TMP3:%.*]] = fadd <2 x double> [[TMP1]], [[TMP2]]
+; SSE-NEXT:    [[TMP4:%.*]] = shufflevector <2 x double> [[TMP3]], <2 x double> poison, <4 x i32> <i32 0, i32 poison, i32 1, i32 poison>
+; SSE-NEXT:    [[VECEXT10:%.*]] = extractelement <4 x double> [[B]], i64 2
+; SSE-NEXT:    [[VECEXT11:%.*]] = extractelement <4 x double> [[B]], i64 3
+; SSE-NEXT:    [[ADD12:%.*]] = fadd double [[VECEXT10]], [[VECEXT11]]
+; SSE-NEXT:    [[SHUFFLE:%.*]] = insertelement <4 x double> [[TMP4]], double [[ADD12]], i64 3
+; SSE-NEXT:    ret <4 x double> [[SHUFFLE]]
+;
+; AVX1-LABEL: @PR50392(
+; AVX1-NEXT:    [[TMP1:%.*]] = shufflevector <4 x double> [[A:%.*]], <4 x double> [[B:%.*]], <2 x i32> <i32 0, i32 4>
+; AVX1-NEXT:    [[TMP2:%.*]] = shufflevector <4 x double> [[A]], <4 x double> [[B]], <2 x i32> <i32 1, i32 5>
+; AVX1-NEXT:    [[TMP3:%.*]] = fadd <2 x double> [[TMP1]], [[TMP2]]
+; AVX1-NEXT:    [[TMP4:%.*]] = shufflevector <2 x double> [[TMP3]], <2 x double> poison, <4 x i32> <i32 0, i32 poison, i32 1, i32 poison>
+; AVX1-NEXT:    [[VECEXT10:%.*]] = extractelement <4 x double> [[B]], i64 2
+; AVX1-NEXT:    [[VECEXT11:%.*]] = extractelement <4 x double> [[B]], i64 3
+; AVX1-NEXT:    [[ADD12:%.*]] = fadd double [[VECEXT10]], [[VECEXT11]]
+; AVX1-NEXT:    [[SHUFFLE:%.*]] = insertelement <4 x double> [[TMP4]], double [[ADD12]], i64 3
+; AVX1-NEXT:    ret <4 x double> [[SHUFFLE]]
+;
+; AVX2-LABEL: @PR50392(
+; AVX2-NEXT:    [[TMP1:%.*]] = shufflevector <4 x double> [[A:%.*]], <4 x double> [[B:%.*]], <2 x i32> <i32 0, i32 4>
+; AVX2-NEXT:    [[TMP2:%.*]] = shufflevector <4 x double> [[A]], <4 x double> [[B]], <2 x i32> <i32 1, i32 5>
+; AVX2-NEXT:    [[TMP3:%.*]] = fadd <2 x double> [[TMP1]], [[TMP2]]
+; AVX2-NEXT:    [[TMP4:%.*]] = shufflevector <2 x double> [[TMP3]], <2 x double> poison, <4 x i32> <i32 0, i32 poison, i32 1, i32 poison>
+; AVX2-NEXT:    [[SHIFT:%.*]] = shufflevector <4 x double> [[B]], <4 x double> poison, <4 x i32> <i32 poison, i32 poison, i32 3, i32 poison>
+; AVX2-NEXT:    [[TMP5:%.*]] = fadd <4 x double> [[B]], [[SHIFT]]
+; AVX2-NEXT:    [[SHUFFLE:%.*]] = shufflevector <4 x double> [[TMP4]], <4 x double> [[TMP5]], <4 x i32> <i32 0, i32 poison, i32 2, i32 6>
+; AVX2-NEXT:    ret <4 x double> [[SHUFFLE]]
+;
+  %vecext = extractelement <4 x double> %a, i32 0
+  %vecext1 = extractelement <4 x double> %a, i32 1
+  %add = fadd double %vecext, %vecext1
+  %vecinit = insertelement <4 x double> poison, double %add, i32 0
+  %vecext2 = extractelement <4 x double> %a, i32 2
+  %vecext3 = extractelement <4 x double> %a, i32 3
+  %add4 = fadd double %vecext2, %vecext3
+  %vecinit5 = insertelement <4 x double> %vecinit, double %add4, i32 1
+  %vecext6 = extractelement <4 x double> %b, i32 0
+  %vecext7 = extractelement <4 x double> %b, i32 1
+  %add8 = fadd double %vecext6, %vecext7
+  %vecinit9 = insertelement <4 x double> %vecinit5, double %add8, i32 2
+  %vecext10 = extractelement <4 x double> %b, i32 2
+  %vecext11 = extractelement <4 x double> %b, i32 3
+  %add12 = fadd double %vecext10, %vecext11
+  %vecinit13 = insertelement <4 x double> %vecinit9, double %add12, i32 3
+  %shuffle = shufflevector <4 x double> %vecinit13, <4 x double> %a, <4 x i32> <i32 0, i32 poison, i32 2, i32 3>
+  ret <4 x double> %shuffle
+}
+;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
+; AVX: {{.*}}