1; RUN: llc %s -o - | FileCheck %s
2
3; This test case was generated by running
4;
5;   clang++ -O2 -g PR37234.cpp -S -save-temps
6;   opt -O2 -S PR37234.bc -o PR37234.ll
7;
8; using the following PR37234.cpp program
9;
10;    int main() {
11;            const char* buffer = "aaa";
12;            unsigned aa = 0;
13;            while (char c = *buffer++) {
14;                    if (c == 'a')
15;                            ++aa;  // DexWatch('aa')
16;            }
17;            return aa;
18;    }
19
20
21; CHECK-LABEL: # %bb.{{.*}}:
22; CHECK:        #DEBUG_VALUE: main:aa <- 0
23; CHECK: .LBB0_1:
24; CHECK: 	#DEBUG_VALUE: main:aa <- $[[REG:[0-9a-z]+]]
25; CHECK:        je      .LBB0_4
26; CHECK: # %bb.{{.*}}:
27; CHECK:        #DEBUG_VALUE: main:aa <- $[[REG]]
28; CHECK:        jne     .LBB0_1
29; CHECK: # %bb.{{.*}}:
30; CHECK:        #DEBUG_VALUE: main:aa <- $[[REG]]
31; CHECK:        incl    %[[REG]]
32; CHECK:        #DEBUG_VALUE: main:aa <- $[[REG]]
33; CHECK:        jmp     .LBB0_1
34; CHECK: .LBB0_4:
35; CHECK: 	#DEBUG_VALUE: main:aa <- $[[REG]]
36; CHECK: 	retq
37
38source_filename = "PR37234.cpp"
39target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
40target triple = "x86_64-unknown-linux-gnu"
41
42@.str = private unnamed_addr constant [4 x i8] c"aaa\00", align 1
43
44; Function Attrs: norecurse nounwind readonly uwtable
45define dso_local i32 @main() local_unnamed_addr #0 !dbg !7 {
46entry:
47  call void @llvm.dbg.value(metadata i32 0, metadata !16, metadata !DIExpression()), !dbg !19
48  br label %while.cond.outer, !dbg !20
49
50while.cond.outer:                                 ; preds = %if.then, %entry
51  %buffer.0.ph = phi i8* [ %incdec.ptr, %if.then ], [ getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), %entry ]
52  %aa.0.ph = phi i32 [ %inc, %if.then ], [ 0, %entry ]
53  br label %while.cond, !dbg !21
54
55while.cond:                                       ; preds = %while.cond.outer, %while.cond
56  %buffer.0 = phi i8* [ %incdec.ptr, %while.cond ], [ %buffer.0.ph, %while.cond.outer ], !dbg !22
57  call void @llvm.dbg.value(metadata i32 %aa.0.ph, metadata !16, metadata !DIExpression()), !dbg !19
58  call void @llvm.dbg.value(metadata i8* %buffer.0, metadata !12, metadata !DIExpression()), !dbg !23
59  %incdec.ptr = getelementptr inbounds i8, i8* %buffer.0, i64 1, !dbg !21
60  call void @llvm.dbg.value(metadata i8* %incdec.ptr, metadata !12, metadata !DIExpression()), !dbg !23
61  %0 = load i8, i8* %buffer.0, align 1, !dbg !24, !tbaa !25
62  call void @llvm.dbg.value(metadata i8 %0, metadata !18, metadata !DIExpression()), !dbg !28
63  switch i8 %0, label %while.cond [
64    i8 0, label %while.end
65    i8 97, label %if.then
66  ], !dbg !20
67
68if.then:                                          ; preds = %while.cond
69  %inc = add i32 %aa.0.ph, 1, !dbg !29
70  call void @llvm.dbg.value(metadata i32 %inc, metadata !16, metadata !DIExpression()), !dbg !19
71  br label %while.cond.outer, !dbg !29
72
73while.end:                                        ; preds = %while.cond
74  call void @llvm.dbg.value(metadata i32 %aa.0.ph, metadata !16, metadata !DIExpression()), !dbg !19
75  call void @llvm.dbg.value(metadata i32 %aa.0.ph, metadata !16, metadata !DIExpression()), !dbg !19
76  call void @llvm.dbg.value(metadata i32 %aa.0.ph, metadata !16, metadata !DIExpression()), !dbg !19
77  call void @llvm.dbg.value(metadata i32 %aa.0.ph, metadata !16, metadata !DIExpression()), !dbg !19
78  ret i32 %aa.0.ph, !dbg !32
79}
80
81; Function Attrs: nounwind readnone speculatable
82declare void @llvm.dbg.value(metadata, metadata, metadata) #1
83
84attributes #0 = { norecurse nounwind readonly uwtable }
85attributes #1 = { nounwind readnone speculatable }
86
87!llvm.dbg.cu = !{!0}
88!llvm.module.flags = !{!3, !4, !5}
89!llvm.ident = !{!6}
90
91!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 7.0.0 (trunk 330946) (llvm/trunk 330952)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
92!1 = !DIFile(filename: "PR37234.cpp", directory: "")
93!2 = !{}
94!3 = !{i32 2, !"Dwarf Version", i32 4}
95!4 = !{i32 2, !"Debug Info Version", i32 3}
96!5 = !{i32 1, !"wchar_size", i32 4}
97!6 = !{!"clang version 7.0.0 (trunk 330946) (llvm/trunk 330952)"}
98!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !11)
99!8 = !DISubroutineType(types: !9)
100!9 = !{!10}
101!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
102!11 = !{!12, !16, !18}
103!12 = !DILocalVariable(name: "buffer", scope: !7, file: !1, line: 2, type: !13)
104!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64)
105!14 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !15)
106!15 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
107!16 = !DILocalVariable(name: "aa", scope: !7, file: !1, line: 3, type: !17)
108!17 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
109!18 = !DILocalVariable(name: "c", scope: !7, file: !1, line: 4, type: !15)
110!19 = !DILocation(line: 3, column: 18, scope: !7)
111!20 = !DILocation(line: 4, column: 9, scope: !7)
112!21 = !DILocation(line: 4, column: 32, scope: !7)
113!22 = !DILocation(line: 0, scope: !7)
114!23 = !DILocation(line: 2, column: 21, scope: !7)
115!24 = !DILocation(line: 4, column: 25, scope: !7)
116!25 = !{!26, !26, i64 0}
117!26 = !{!"omnipotent char", !27, i64 0}
118!27 = !{!"Simple C++ TBAA"}
119!28 = !DILocation(line: 4, column: 21, scope: !7)
120!29 = !DILocation(line: 6, column: 25, scope: !30)
121!30 = distinct !DILexicalBlock(scope: !31, file: !1, line: 5, column: 21)
122!31 = distinct !DILexicalBlock(scope: !7, file: !1, line: 4, column: 36)
123!32 = !DILocation(line: 9, column: 1, scope: !7)
124