[SLP][NFC]Add a test for PR72202 to show a bug in a mask generation for

vectorized extractelements operands.

Author: alexey-bataev

llvm/test/Transforms/SLPVectorizer/X86/extractelements-vector-ops-shuffle.ll

@@ -0,0 +1,53 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
+; RUN: opt -S --passes=slp-vectorizer -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s
+
+define double @test() {
+; CHECK-LABEL: define double @test() {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[TMP0:%.*]] = load <2 x double>, ptr getelementptr inbounds ([13 x double], ptr null, i64 0, i64 5), align 8
+; CHECK-NEXT:    [[TMP1:%.*]] = load <2 x double>, ptr getelementptr inbounds ([13 x double], ptr null, i64 0, i64 8), align 16
+; CHECK-NEXT:    [[TMP2:%.*]] = shufflevector <2 x double> [[TMP0]], <2 x double> [[TMP1]], <2 x i32> <i32 1, i32 3>
+; CHECK-NEXT:    [[TMP3:%.*]] = shufflevector <2 x double> [[TMP2]], <2 x double> poison, <4 x i32> <i32 0, i32 1, i32 poison, i32 poison>
+; CHECK-NEXT:    [[TMP4:%.*]] = fmul <4 x double> zeroinitializer, [[TMP3]]
+; CHECK-NEXT:    [[TMP5:%.*]] = call reassoc nsz double @llvm.vector.reduce.fadd.v4f64(double -0.000000e+00, <4 x double> [[TMP4]])
+; CHECK-NEXT:    [[TMP6:%.*]] = fmul double [[TMP5]], 0.000000e+00
+; CHECK-NEXT:    store double [[TMP6]], ptr null, align 16
+; CHECK-NEXT:    br label [[BB:%.*]]
+; CHECK:       bb:
+; CHECK-NEXT:    [[TMP7:%.*]] = fmul <2 x double> [[TMP1]], zeroinitializer
+; CHECK-NEXT:    [[TMP8:%.*]] = extractelement <2 x double> [[TMP7]], i32 0
+; CHECK-NEXT:    [[TMP9:%.*]] = extractelement <2 x double> [[TMP7]], i32 1
+; CHECK-NEXT:    [[TMP10:%.*]] = fadd double [[TMP8]], [[TMP9]]
+; CHECK-NEXT:    [[TMP11:%.*]] = fmul <2 x double> [[TMP0]], zeroinitializer
+; CHECK-NEXT:    [[TMP12:%.*]] = extractelement <2 x double> [[TMP11]], i32 1
+; CHECK-NEXT:    [[TMP13:%.*]] = fadd double [[TMP12]], [[TMP10]]
+; CHECK-NEXT:    [[TMP14:%.*]] = extractelement <2 x double> [[TMP11]], i32 0
+; CHECK-NEXT:    [[TMP15:%.*]] = fadd double [[TMP14]], [[TMP13]]
+; CHECK-NEXT:    ret double [[TMP15]]
+;
+entry:
+  %0 = fmul double 0.000000e+00, 0.000000e+00
+  %1 = fmul double 0.000000e+00, 0.000000e+00
+  %2 = fadd reassoc nsz double %1, %0
+  %3 = load double, ptr getelementptr inbounds ([13 x double], ptr null, i64 0, i64 5), align 8
+  %4 = load double, ptr getelementptr inbounds ([13 x double], ptr null, i64 0, i64 6), align 16
+  %5 = fmul double %4, 0.000000e+00
+  %6 = fadd reassoc nsz double %5, %2
+  %7 = load double, ptr getelementptr inbounds ([13 x double], ptr null, i64 0, i64 8), align 16
+  %8 = load double, ptr getelementptr inbounds ([13 x double], ptr null, i64 0, i64 9), align 8
+  %9 = fmul double %8, 0.000000e+00
+  %10 = fadd reassoc nsz double %9, %6
+  %11 = fmul double %10, 0.000000e+00
+  store double %11, ptr null, align 16
+  br label %bb
+
+bb:
+  %12 = fmul double %8, 0.000000e+00
+  %13 = fmul double %7, 0.000000e+00
+  %14 = fadd double %13, %12
+  %15 = fmul double %4, 0.000000e+00
+  %16 = fadd double %15, %14
+  %17 = fmul double %3, 0.000000e+00
+  %18 = fadd double %17, %16
+  ret double %18
+}