[SLP][NFC]Add a test for minbitwidth analysis of icmp, being transformed

to trunc.

Author: alexey-bataev

llvm/test/Transforms/SLPVectorizer/X86/minbitwidth-icmp-to-trunc.ll

@@ -0,0 +1,70 @@
+; 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 -mcpu=cascadelake < %s | FileCheck %s
+
+define i1 @test(ptr noalias %0, i64 %1, ptr noalias %p, ptr %p1) {
+; CHECK-LABEL: define i1 @test(
+; CHECK-SAME: ptr noalias [[TMP0:%.*]], i64 [[TMP1:%.*]], ptr noalias [[P:%.*]], ptr [[P1:%.*]]) #[[ATTR0:[0-9]+]] {
+; CHECK-NEXT:  newFuncRoot:
+; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr inbounds i8, ptr [[TMP0]], i64 16
+; CHECK-NEXT:    [[BF_LOAD_I1336:%.*]] = load i24, ptr [[TMP2]], align 16
+; CHECK-NEXT:    [[AND_I_I_I1342:%.*]] = and i64 [[TMP1]], -16
+; CHECK-NEXT:    [[TMP3:%.*]] = inttoptr i64 [[AND_I_I_I1342]] to ptr
+; CHECK-NEXT:    store ptr [[TMP3]], ptr [[P]], align 8
+; CHECK-NEXT:    [[TMP4:%.*]] = load ptr, ptr [[TMP3]], align 16
+; CHECK-NEXT:    [[TMP5:%.*]] = getelementptr inbounds i8, ptr [[TMP4]], i64 16
+; CHECK-NEXT:    [[BF_LOAD_I1345:%.*]] = load i24, ptr [[TMP5]], align 16
+; CHECK-NEXT:    [[TMP6:%.*]] = insertelement <2 x i24> poison, i24 [[BF_LOAD_I1336]], i32 0
+; CHECK-NEXT:    [[TMP7:%.*]] = insertelement <2 x i24> [[TMP6]], i24 [[BF_LOAD_I1345]], i32 1
+; CHECK-NEXT:    [[TMP8:%.*]] = and <2 x i24> [[TMP7]], <i24 255, i24 255>
+; CHECK-NEXT:    [[TMP9:%.*]] = icmp eq <2 x i24> [[TMP8]], <i24 24, i24 24>
+; CHECK-NEXT:    [[TMP10:%.*]] = select <2 x i1> [[TMP9]], <2 x i24> <i24 23, i24 23>, <2 x i24> [[TMP8]]
+; CHECK-NEXT:    [[TMP11:%.*]] = zext <2 x i24> [[TMP10]] to <2 x i32>
+; CHECK-NEXT:    [[TMP12:%.*]] = and <2 x i32> [[TMP11]], <i32 254, i32 254>
+; CHECK-NEXT:    [[TMP13:%.*]] = icmp eq <2 x i32> [[TMP12]], <i32 4, i32 4>
+; CHECK-NEXT:    [[TMP14:%.*]] = select <2 x i1> [[TMP13]], <2 x i32> <i32 2, i32 2>, <2 x i32> [[TMP11]]
+; CHECK-NEXT:    [[TMP15:%.*]] = icmp eq <2 x i32> [[TMP14]], <i32 32, i32 32>
+; CHECK-NEXT:    [[TMP16:%.*]] = select <2 x i1> [[TMP15]], <2 x i32> <i32 31, i32 31>, <2 x i32> [[TMP14]]
+; CHECK-NEXT:    [[TMP17:%.*]] = icmp eq <2 x i32> [[TMP16]], <i32 54, i32 54>
+; CHECK-NEXT:    [[TMP18:%.*]] = select <2 x i1> [[TMP17]], <2 x i32> <i32 53, i32 53>, <2 x i32> [[TMP16]]
+; CHECK-NEXT:    [[TMP19:%.*]] = extractelement <2 x i32> [[TMP18]], i32 0
+; CHECK-NEXT:    store i32 [[TMP19]], ptr [[P1]], align 4
+; CHECK-NEXT:    [[TMP20:%.*]] = extractelement <2 x i32> [[TMP18]], i32 1
+; CHECK-NEXT:    [[CMP210_NOT:%.*]] = icmp eq i32 [[TMP19]], [[TMP20]]
+; CHECK-NEXT:    ret i1 [[CMP210_NOT]]
+;
+newFuncRoot:
+  %2 = getelementptr inbounds i8, ptr %0, i64 16
+  %bf.load.i1336 = load i24, ptr %2, align 16
+  %bf.clear.i1337 = and i24 %bf.load.i1336, 255
+  %and.i.i.i1342 = and i64 %1, -16
+  %3 = inttoptr i64 %and.i.i.i1342 to ptr
+  store ptr %3, ptr %p, align 8
+  %4 = load ptr, ptr %3, align 16
+  %5 = getelementptr inbounds i8, ptr %4, i64 16
+  %bf.load.i1345 = load i24, ptr %5, align 16
+  %bf.clear.i1346 = and i24 %bf.load.i1345, 255
+  %cmp182 = icmp eq i24 %bf.clear.i1337, 24
+  %narrow = select i1 %cmp182, i24 23, i24 %bf.clear.i1337
+  %s = zext nneg i24 %narrow to i32
+  %cmp185 = icmp eq i24 %bf.clear.i1346, 24
+  %narrow1790 = select i1 %cmp185, i24 23, i24 %bf.clear.i1346
+  %s1139 = zext nneg i24 %narrow1790 to i32
+  %6 = and i32 %s, 254
+  %or.cond1132 = icmp eq i32 %6, 4
+  %s1142 = select i1 %or.cond1132, i32 2, i32 %s
+  %7 = and i32 %s1139, 254
+  %or.cond1133 = icmp eq i32 %7, 4
+  %s1140 = select i1 %or.cond1133, i32 2, i32 %s1139
+  %cmp198 = icmp eq i32 %s1142, 32
+  %s1134 = select i1 %cmp198, i32 31, i32 %s1142
+  %cmp201 = icmp eq i32 %s1140, 32
+  %s1143 = select i1 %cmp201, i32 31, i32 %s1140
+  %cmp204 = icmp eq i32 %s1134, 54
+  %s1135 = select i1 %cmp204, i32 53, i32 %s1134
+  store i32 %s1135, ptr %p1, align 4
+  %cmp207 = icmp eq i32 %s1143, 54
+  %s1141 = select i1 %cmp207, i32 53, i32 %s1143
+  %cmp210.not = icmp eq i32 %s1135, %s1141
+  ret i1 %cmp210.not
+}
+