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
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
8 ; NOANALYSIS-NOT: remark: {{.*}}
9 ; NOANALYSIS: warning: source.cpp:4:5: loop not interleaved: failed explicitly specified loop interleaving
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
15 ; CHECK: _Z11test_switchPii
19 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
21 ; Function Attrs: nounwind optsize ssp uwtable
22 define void @_Z11test_switchPii(i32* nocapture %A, i32 %Length) #0 {
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
27 for.body.preheader: ; preds = %entry
28 br label %for.body, !dbg !14
30 for.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 [
39 sw.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
44 sw.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
49 for.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
57 for.end.loopexit: ; preds = %for.inc
60 for.end: ; preds = %for.end.loopexit, %entry
64 attributes #0 = { nounwind }
67 !llvm.module.flags = !{!7, !8}
70 !0 = distinct !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)
71 !1 = !DIFile(filename: "source.cpp", directory: ".")
74 !4 = distinct !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)
75 !5 = !DIFile(filename: "source.cpp", directory: ".")
76 !6 = !DISubroutineType(types: !2)
77 !7 = !{i32 2, !"Dwarf Version", i32 2}
78 !8 = !{i32 2, !"Debug Info Version", i32 3}
79 !9 = !{!"clang version 3.5.0"}
80 !10 = !DILocation(line: 3, column: 8, scope: !11)
81 !11 = distinct !DILexicalBlock(line: 3, column: 3, file: !1, scope: !4)
82 !12 = !{!12, !13, !13}
83 !13 = !{!"llvm.loop.vectorize.enable", i1 true}
84 !14 = !DILocation(line: 4, column: 5, scope: !15)
85 !15 = distinct !DILexicalBlock(line: 3, column: 36, file: !1, scope: !11)
86 !16 = !{!17, !17, i64 0}
87 !17 = !{!"int", !18, i64 0}
88 !18 = !{!"omnipotent char", !19, i64 0}
89 !19 = !{!"Simple C/C++ TBAA"}
90 !20 = !DILocation(line: 6, column: 7, scope: !21)
91 !21 = distinct !DILexicalBlock(line: 4, column: 18, file: !1, scope: !15)
92 !22 = !DILocation(line: 7, column: 5, scope: !21)
93 !23 = !DILocation(line: 9, column: 7, scope: !21)
94 !24 = !DILocation(line: 14, column: 1, scope: !4)