1; RUN: opt %s -S -o - -loop-unroll | FileCheck %s
2; generated at -O3 from:
3; void f() {
4;   for (int i = 1; i <=32; i <<=2 )
5;     bar(i>>1);
6; }
7source_filename = "/tmp/loop.c"
8target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
9target triple = "x86_64-apple-macosx10.13.0"
10
11; Function Attrs: nounwind ssp uwtable
12define void @f() local_unnamed_addr #0 !dbg !8 {
13entry:
14  tail call void @llvm.dbg.value(metadata i32 1, metadata !12, metadata !DIExpression()), !dbg !15
15  br label %for.body, !dbg !16
16
17for.cond.cleanup:                                 ; preds = %for.body
18  ret void, !dbg !17
19
20for.body:                                         ; preds = %entry, %for.body
21  %i.04 = phi i32 [ 1, %entry ], [ %shl, %for.body ]
22  tail call void @llvm.dbg.value(metadata i32 %i.04, metadata !12, metadata !DIExpression()), !dbg !15
23  %shr = ashr i32 %i.04, 1, !dbg !18
24
25  ; The loop gets unrolled entirely.
26  ; CHECK: call void @llvm.dbg.value(metadata i32 1, metadata !12, metadata !DIExpression()), !dbg !15
27  ; CHECK: call void @llvm.dbg.value(metadata i32 4, metadata !12, metadata !DIExpression()), !dbg !15
28  ; CHECK: call void @llvm.dbg.value(metadata i32 16, metadata !12, metadata !DIExpression()), !dbg !15
29  ; CHECK: call void @llvm.dbg.value(metadata i32 64, metadata !12, metadata !DIExpression()), !dbg !15
30
31  %call = tail call i32 (i32, ...) bitcast (i32 (...)* @bar to i32 (i32, ...)*)(i32 %shr) #3, !dbg !20
32  %shl = shl i32 %i.04, 2, !dbg !21
33  tail call void @llvm.dbg.value(metadata i32 %shl, metadata !12, metadata !DIExpression()), !dbg !15
34  %cmp = icmp slt i32 %shl, 33, !dbg !22
35  br i1 %cmp, label %for.body, label %for.cond.cleanup, !dbg !16, !llvm.loop !23
36}
37
38declare i32 @bar(...) local_unnamed_addr
39
40; Function Attrs: nounwind readnone speculatable
41declare void @llvm.dbg.value(metadata, metadata, metadata) #2
42
43attributes #0 = { nounwind ssp uwtable }
44attributes #2 = { nounwind readnone speculatable }
45attributes #3 = { nounwind }
46
47!llvm.dbg.cu = !{!0}
48!llvm.module.flags = !{!3, !4, !5, !6}
49!llvm.ident = !{!7}
50
51!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 (trunk 317113) (llvm/trunk 317122)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
52!1 = !DIFile(filename: "/tmp/loop.c", directory: "/Data/llvm")
53!2 = !{}
54!3 = !{i32 2, !"Dwarf Version", i32 4}
55!4 = !{i32 2, !"Debug Info Version", i32 3}
56!5 = !{i32 1, !"wchar_size", i32 4}
57!6 = !{i32 7, !"PIC Level", i32 2}
58!7 = !{!"clang version 6.0.0 (trunk 317113) (llvm/trunk 317122)"}
59!8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !9, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, retainedNodes: !11)
60!9 = !DISubroutineType(types: !10)
61!10 = !{null}
62!11 = !{!12}
63!12 = !DILocalVariable(name: "i", scope: !13, file: !1, line: 2, type: !14)
64!13 = distinct !DILexicalBlock(scope: !8, file: !1, line: 2, column: 3)
65!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
66!15 = !DILocation(line: 2, column: 12, scope: !13)
67!16 = !DILocation(line: 2, column: 3, scope: !13)
68!17 = !DILocation(line: 4, column: 1, scope: !8)
69!18 = !DILocation(line: 3, column: 10, scope: !19)
70!19 = distinct !DILexicalBlock(scope: !13, file: !1, line: 2, column: 3)
71!20 = !DILocation(line: 3, column: 5, scope: !19)
72!21 = !DILocation(line: 2, column: 29, scope: !19)
73!22 = !DILocation(line: 2, column: 21, scope: !19)
74!23 = distinct !{!23, !16, !24}
75!24 = !DILocation(line: 3, column: 13, scope: !13)
76