1; RUN: opt < %s -loop-vectorize -force-vector-width=4 -S 2>&1 | FileCheck %s
2; RUN: opt < %s -loop-vectorize -force-vector-width=1 -S 2>&1 | FileCheck %s -check-prefix=NOANALYSIS
3; RUN: opt < %s -loop-vectorize -force-vector-width=4 -pass-remarks-missed='loop-vectorize' -S 2>&1 | FileCheck %s -check-prefix=MOREINFO
4
5; CHECK: remark: source.cpp:4:5: loop not vectorized: loop contains a switch statement
6; CHECK: warning: source.cpp:4:5: loop not vectorized: failed explicitly specified loop vectorization
7
8; NOANALYSIS-NOT: remark: {{.*}}
9; NOANALYSIS: warning: source.cpp:4:5: loop not interleaved: failed explicitly specified loop interleaving
10
11; MOREINFO: remark: source.cpp:4:5: loop not vectorized: loop contains a switch statement
12; MOREINFO: remark: source.cpp:4:5: loop not vectorized: use -Rpass-analysis=loop-vectorize for more info (Force=true, Vector Width=4)
13; MOREINFO: warning: source.cpp:4:5: loop not vectorized: failed explicitly specified loop vectorization
14
15; CHECK: _Z11test_switchPii
16; CHECK-NOT: x i32>
17; CHECK: ret
18
19target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
20
21; Function Attrs: nounwind optsize ssp uwtable
22define void @_Z11test_switchPii(i32* nocapture %A, i32 %Length) #0 !dbg !4 {
23entry:
24  %cmp18 = icmp sgt i32 %Length, 0, !dbg !10
25  br i1 %cmp18, label %for.body.preheader, label %for.end, !dbg !10, !llvm.loop !12
26
27for.body.preheader:                               ; preds = %entry
28  br label %for.body, !dbg !14
29
30for.body:                                         ; preds = %for.body.preheader, %for.inc
31  %indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %for.body.preheader ]
32  %arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv, !dbg !14
33  %0 = load i32, i32* %arrayidx, align 4, !dbg !14, !tbaa !16
34  switch i32 %0, label %for.inc [
35    i32 0, label %sw.bb
36    i32 1, label %sw.bb3
37  ], !dbg !14
38
39sw.bb:                                            ; preds = %for.body
40  %1 = trunc i64 %indvars.iv to i32, !dbg !20
41  %mul = shl nsw i32 %1, 1, !dbg !20
42  br label %for.inc, !dbg !22
43
44sw.bb3:                                           ; preds = %for.body
45  %2 = trunc i64 %indvars.iv to i32, !dbg !23
46  store i32 %2, i32* %arrayidx, align 4, !dbg !23, !tbaa !16
47  br label %for.inc, !dbg !23
48
49for.inc:                                          ; preds = %sw.bb3, %for.body, %sw.bb
50  %storemerge = phi i32 [ %mul, %sw.bb ], [ 0, %for.body ], [ 0, %sw.bb3 ]
51  store i32 %storemerge, i32* %arrayidx, align 4, !dbg !20, !tbaa !16
52  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !10
53  %lftr.wideiv = trunc i64 %indvars.iv.next to i32, !dbg !10
54  %exitcond = icmp eq i32 %lftr.wideiv, %Length, !dbg !10
55  br i1 %exitcond, label %for.end.loopexit, label %for.body, !dbg !10, !llvm.loop !12
56
57for.end.loopexit:                                 ; preds = %for.inc
58  br label %for.end
59
60for.end:                                          ; preds = %for.end.loopexit, %entry
61  ret void, !dbg !24
62}
63
64attributes #0 = { nounwind }
65
66!llvm.dbg.cu = !{!0}
67!llvm.module.flags = !{!7, !8}
68!llvm.ident = !{!9}
69
70!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0", isOptimized: true, runtimeVersion: 6, emissionKind: LineTablesOnly, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
71!1 = !DIFile(filename: "source.cpp", directory: ".")
72!2 = !{}
73!4 = distinct !DISubprogram(name: "test_switch", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2)
74!5 = !DIFile(filename: "source.cpp", directory: ".")
75!6 = !DISubroutineType(types: !2)
76!7 = !{i32 2, !"Dwarf Version", i32 2}
77!8 = !{i32 2, !"Debug Info Version", i32 3}
78!9 = !{!"clang version 3.5.0"}
79!10 = !DILocation(line: 3, column: 8, scope: !11)
80!11 = distinct !DILexicalBlock(line: 3, column: 3, file: !1, scope: !4)
81!12 = !{!12, !13, !13}
82!13 = !{!"llvm.loop.vectorize.enable", i1 true}
83!14 = !DILocation(line: 4, column: 5, scope: !15)
84!15 = distinct !DILexicalBlock(line: 3, column: 36, file: !1, scope: !11)
85!16 = !{!17, !17, i64 0}
86!17 = !{!"int", !18, i64 0}
87!18 = !{!"omnipotent char", !19, i64 0}
88!19 = !{!"Simple C/C++ TBAA"}
89!20 = !DILocation(line: 6, column: 7, scope: !21)
90!21 = distinct !DILexicalBlock(line: 4, column: 18, file: !1, scope: !15)
91!22 = !DILocation(line: 7, column: 5, scope: !21)
92!23 = !DILocation(line: 9, column: 7, scope: !21)
93!24 = !DILocation(line: 14, column: 1, scope: !4)
94