xref: /llvm-project/llvm/test/Transforms/LoopVectorize/no_switch.ll (revision f0df4fbd0c7b6bb369ceaa1fd6f9e0c88d781ae5) 
1; RUN: opt < %s -passes=loop-vectorize,transform-warning -force-vector-width=4 -S 2>&1 | FileCheck %s
2; RUN: opt < %s -passes=loop-vectorize,transform-warning -force-vector-width=1 -S 2>&1 | FileCheck %s -check-prefix=NOANALYSIS
3; RUN: opt < %s -passes=loop-vectorize,transform-warning -force-vector-width=4 -pass-remarks-missed='loop-vectorize' -S 2>&1 | FileCheck %s -check-prefix=MOREINFO
4
5; CHECK-NOT: loop not vectorized: loop contains a switch statement
6; CHECK-NOT: loop not vectorized: the optimizer was unable to perform the requested transformation; the transformation might be disabled or specified as part of an unsupported transformation ordering
7
8; NOANALYSIS-NOT: remark: {{.*}}
9; NOANALYSIS: loop not vectorized: the optimizer was unable to perform the requested transformation; the transformation might be disabled or specified as part of an unsupported transformation ordering
10
11; MOREINFO-NOT: remark
12
13; CHECK: _Z11test_switchPii
14; CHECK: vector.body:
15; CHECK: ret
16
17target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
18
19; Function Attrs: nounwind optsize ssp uwtable
20define void @_Z11test_switchPii(ptr nocapture %A, i32 %Length) #0 !dbg !4 {
21entry:
22  %cmp18 = icmp sgt i32 %Length, 0, !dbg !10
23  br i1 %cmp18, label %for.body.preheader, label %for.end, !dbg !10, !llvm.loop !12
24
25for.body.preheader:                               ; preds = %entry
26  br label %for.body, !dbg !14
27
28for.body:                                         ; preds = %for.body.preheader, %for.inc
29  %indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %for.body.preheader ]
30  %arrayidx = getelementptr inbounds i32, ptr %A, i64 %indvars.iv, !dbg !14
31  %0 = load i32, ptr %arrayidx, align 4, !dbg !14, !tbaa !16
32  switch i32 %0, label %for.inc [
33    i32 0, label %sw.bb
34    i32 1, label %sw.bb3
35  ], !dbg !14
36
37sw.bb:                                            ; preds = %for.body
38  %1 = trunc i64 %indvars.iv to i32, !dbg !20
39  %mul = shl nsw i32 %1, 1, !dbg !20
40  br label %for.inc, !dbg !22
41
42sw.bb3:                                           ; preds = %for.body
43  %2 = trunc i64 %indvars.iv to i32, !dbg !23
44  store i32 %2, ptr %arrayidx, align 4, !dbg !23, !tbaa !16
45  br label %for.inc, !dbg !23
46
47for.inc:                                          ; preds = %sw.bb3, %for.body, %sw.bb
48  %storemerge = phi i32 [ %mul, %sw.bb ], [ 0, %for.body ], [ 0, %sw.bb3 ]
49  store i32 %storemerge, ptr %arrayidx, align 4, !dbg !20, !tbaa !16
50  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !10
51  %lftr.wideiv = trunc i64 %indvars.iv.next to i32, !dbg !10
52  %exitcond = icmp eq i32 %lftr.wideiv, %Length, !dbg !10
53  br i1 %exitcond, label %for.end.loopexit, label %for.body, !dbg !10, !llvm.loop !12
54
55for.end.loopexit:                                 ; preds = %for.inc
56  br label %for.end
57
58for.end:                                          ; preds = %for.end.loopexit, %entry
59  ret void, !dbg !24
60}
61
62attributes #0 = { nounwind }
63
64!llvm.dbg.cu = !{!0}
65!llvm.module.flags = !{!7, !8}
66!llvm.ident = !{!9}
67
68!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)
69!1 = !DIFile(filename: "source.cpp", directory: ".")
70!2 = !{}
71!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, retainedNodes: !2)
72!5 = !DIFile(filename: "source.cpp", directory: ".")
73!6 = !DISubroutineType(types: !2)
74!7 = !{i32 2, !"Dwarf Version", i32 2}
75!8 = !{i32 2, !"Debug Info Version", i32 3}
76!9 = !{!"clang version 3.5.0"}
77!10 = !DILocation(line: 3, column: 8, scope: !11)
78!11 = distinct !DILexicalBlock(line: 3, column: 3, file: !1, scope: !4)
79!12 = !{!12, !13, !13}
80!13 = !{!"llvm.loop.vectorize.enable", i1 true}
81!14 = !DILocation(line: 4, column: 5, scope: !15)
82!15 = distinct !DILexicalBlock(line: 3, column: 36, file: !1, scope: !11)
83!16 = !{!17, !17, i64 0}
84!17 = !{!"int", !18, i64 0}
85!18 = !{!"omnipotent char", !19, i64 0}
86!19 = !{!"Simple C/C++ TBAA"}
87!20 = !DILocation(line: 6, column: 7, scope: !21)
88!21 = distinct !DILexicalBlock(line: 4, column: 18, file: !1, scope: !15)
89!22 = !DILocation(line: 7, column: 5, scope: !21)
90!23 = !DILocation(line: 9, column: 7, scope: !21)
91!24 = !DILocation(line: 14, column: 1, scope: !4)
92