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