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1; RUN: opt -S -strip-nonlinetable-debuginfo %s -o %t
2; RUN: cat %t | FileCheck %s
3; RUN: cat %t | FileCheck %s --check-prefix=NEGATIVE
4; void f(volatile int *i) {
5;   while (--*i) {}
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-macosx10.12.0"
10
11define void @f(i32* %i) local_unnamed_addr #0 !dbg !7 {
12entry:
13  tail call void @llvm.dbg.value(metadata i32* %i, metadata !14, metadata !15), !dbg !16
14  br label %while.cond, !dbg !17
15
16while.cond:                                       ; preds = %while.cond, %entry
17  %0 = load volatile i32, i32* %i, align 4, !dbg !18, !tbaa !19
18  %dec = add nsw i32 %0, -1, !dbg !18
19  store volatile i32 %dec, i32* %i, align 4, !dbg !18, !tbaa !19
20  %tobool = icmp eq i32 %dec, 0, !dbg !17
21  ; CHECK: !llvm.loop ![[LOOP:[0-9]+]]
22  br i1 %tobool, label %while.end, label %while.cond, !dbg !17, !llvm.loop !23
23
24while.end:                                        ; preds = %while.cond
25  ret void, !dbg !25
26}
27
28; Function Attrs: nounwind readnone
29declare void @llvm.dbg.value(metadata, metadata, metadata) #1
30
31attributes #0 = { nounwind ssp uwtable }
32attributes #1 = { nounwind readnone }
33
34!llvm.dbg.cu = !{!0}
35!llvm.module.flags = !{!3, !4, !5}
36!llvm.ident = !{!6}
37
38; CHECK: ![[CU:.*]] = distinct !DICompileUnit(language: DW_LANG_C99,
39; CHECK-SAME:                                 emissionKind: LineTablesOnly
40; NEGATIVE-NOT: !DICompileUnit({{.*}} emissionKind: FullDebug
41!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 5.0.0 (trunk 298880) (llvm/trunk 298875)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
42!1 = !DIFile(filename: "/tmp/loop.c", directory: "/")
43!2 = !{}
44!3 = !{i32 2, !"Dwarf Version", i32 4}
45!4 = !{i32 2, !"Debug Info Version", i32 3}
46!5 = !{i32 1, !"PIC Level", i32 2}
47!6 = !{!"clang version 5.0.0 (trunk 298880) (llvm/trunk 298875)"}
48; CHECK: ![[F:[0-9]]] = distinct !DISubprogram(name: "f", scope: !1
49!7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !13)
50!8 = !DISubroutineType(types: !9)
51!9 = !{null, !10}
52!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64)
53!11 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !12)
54; NEGATIVE-NOT: !DIBasicType(name: "int",
55!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
56!13 = !{!14}
57!14 = !DILocalVariable(name: "i", arg: 1, scope: !7, file: !1, line: 1, type: !10)
58!15 = !DIExpression()
59!16 = !DILocation(line: 1, column: 22, scope: !7)
60; CHECK: ![[BEGIN:[0-9]+]] = !DILocation(line: 2, column: 3, scope: ![[F]])
61!17 = !DILocation(line: 2, column: 3, scope: !7)
62!18 = !DILocation(line: 2, column: 10, scope: !7)
63!19 = !{!20, !20, i64 0}
64!20 = !{!"int", !21, i64 0}
65!21 = !{!"omnipotent char", !22, i64 0}
66!22 = !{!"Simple C/C++ TBAA"}
67; CHECK: ![[LOOP]] = distinct !{![[LOOP]], ![[BEGIN]], ![[END:[0-9]+]]}
68!23 = distinct !{!23, !17, !24}
69; CHECK: ![[END]] = !DILocation(line: 3, column: 3, scope: ![[F]])
70!24 = !DILocation(line: 3, column: 3, scope: !7)
71!25 = !DILocation(line: 4, column: 1, scope: !7)
72