1; RUN: llc < %s -stop-after=virtregrewriter -o - | FileCheck %s
2;
3; NVPTX produces a different order of the BBs
4; XFAIL: nvptx
5
6; Generated with "clang++ -g -O1 -S -emit-llvm"
7;
8; inline bool bar(char c) {
9;   return c >= '0' && c <= '9';
10; }
11;
12; unsigned foo(const char* data,
13;              int length,
14;              int* parsing_result) {
15;   unsigned value = 0;
16;   int result = 1;
17;   bool overflow = 0;
18;
19;   while (bar(*data)) {
20;     if (value > 1) {
21;       result = 2;
22;       overflow = 1;
23;     }
24;
25;     if (!overflow)
26;       value = value + 1;
27;   }
28;
29;   if (length == 0 || value) {
30;     if (!overflow)
31;       result = 0;
32;   } else {
33;     result = 1;
34;   }
35; bye:
36;   *parsing_result = result;
37;   return result == 0 ? value : 0;
38; }
39;
40; CHECK: {{^body:}}
41; CHECK: bye.thread21:
42; CHECK: DBG_LABEL !14
43; CHECK: if.then5:
44; CHECK: DBG_LABEL !14
45; CHECK-NOT: DBG_LABEL !14
46
47$_Z3barc = comdat any
48
49; Function Attrs: nounwind uwtable
50define dso_local i32 @_Z3fooPKciPi(i8* nocapture readonly %data, i32 %length, i32* nocapture %parsing_result) local_unnamed_addr !dbg !4 {
51entry:
52  %0 = load i8, i8* %data, align 1
53  %call23 = tail call zeroext i1 @_Z3barc(i8 signext %0), !dbg !15
54  br i1 %call23, label %while.body, label %while.end
55
56while.body:                                       ; preds = %entry, %while.body
57  %overflow.026 = phi i8 [ %spec.select18, %while.body ], [ 0, %entry ]
58  %result.025 = phi i32 [ %spec.select, %while.body ], [ 1, %entry ]
59  %value.024 = phi i32 [ %value.1, %while.body ], [ 0, %entry ]
60  %cmp = icmp ugt i32 %value.024, 1
61  %spec.select = select i1 %cmp, i32 2, i32 %result.025
62  %spec.select18 = select i1 %cmp, i8 1, i8 %overflow.026
63  %1 = and i8 %spec.select18, 1
64  %2 = xor i8 %1, 1
65  %3 = zext i8 %2 to i32
66  %value.1 = add i32 %value.024, %3
67  %4 = load i8, i8* %data, align 1
68  %call = tail call zeroext i1 @_Z3barc(i8 signext %4), !dbg !15
69  br i1 %call, label %while.body, label %while.end.loopexit
70
71while.end.loopexit:                               ; preds = %while.body
72  %phitmp = and i8 %spec.select18, 1
73  br label %while.end
74
75while.end:                                        ; preds = %while.end.loopexit, %entry
76  %value.0.lcssa = phi i32 [ 0, %entry ], [ %value.1, %while.end.loopexit ]
77  %result.0.lcssa = phi i32 [ 1, %entry ], [ %spec.select, %while.end.loopexit ]
78  %overflow.0.lcssa = phi i8 [ 0, %entry ], [ %phitmp, %while.end.loopexit ]
79  %cmp3 = icmp eq i32 %length, 0
80  %tobool4 = icmp ne i32 %value.0.lcssa, 0
81  %or.cond = or i1 %cmp3, %tobool4
82  br i1 %or.cond, label %if.then5, label %bye.thread21
83
84bye.thread21:                                     ; preds = %while.end
85  call void @llvm.dbg.label(metadata !14), !dbg !16
86  store i32 1, i32* %parsing_result, align 4
87  br label %6
88
89if.then5:                                         ; preds = %while.end
90  %tobool6 = icmp eq i8 %overflow.0.lcssa, 0
91  call void @llvm.dbg.label(metadata !14), !dbg !16
92  call void @llvm.dbg.label(metadata !14), !dbg !16
93  br i1 %tobool6, label %bye.thread, label %bye
94
95bye.thread:                                       ; preds = %if.then5
96  store i32 0, i32* %parsing_result, align 4
97  br label %5
98
99bye:                                              ; preds = %if.then5
100  store i32 %result.0.lcssa, i32* %parsing_result, align 4
101  %cmp10 = icmp eq i32 %result.0.lcssa, 0
102  br i1 %cmp10, label %5, label %6
103
104; <label>:5:                                      ; preds = %bye.thread, %bye
105  br label %6
106
107; <label>:6:                                      ; preds = %bye.thread21, %bye, %5
108  %7 = phi i32 [ %value.0.lcssa, %5 ], [ 0, %bye ], [ 0, %bye.thread21 ]
109  ret i32 %7
110}
111
112; Function Attrs: inlinehint nounwind uwtable
113define linkonce_odr dso_local zeroext i1 @_Z3barc(i8 signext %c) local_unnamed_addr comdat {
114entry:
115  %c.off = add i8 %c, -48
116  %0 = icmp ult i8 %c.off, 10
117  ret i1 %0
118}
119
120; Function Attrs: nounwind readnone speculatable
121declare void @llvm.dbg.label(metadata) #0
122
123attributes #0 = { nounwind readnone speculatable }
124
125!llvm.dbg.cu = !{!0}
126!llvm.module.flags = !{!3}
127
128!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
129!1 = !DIFile(filename: "live-debug-label.cc", directory: ".")
130!2 = !{}
131!3 = !{i32 2, !"Debug Info Version", i32 3}
132!4 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fooPKciPi", scope: !1, file: !1, line: 5, type: !5, isLocal: false, isDefinition: true, scopeLine: 7, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !13)
133!5 = !DISubroutineType(types: !6)
134!6 = !{!7, !8, !11, !12}
135!7 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
136!8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64)
137!9 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !10)
138!10 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
139!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
140!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64)
141!13 = !{!14}
142!14 = !DILabel(scope: !4, name: "bye", file: !1, line: 28)
143!15 = !DILocation(line: 12, column: 10, scope: !4)
144!16 = !DILocation(line: 28, column: 1, scope: !4)
145