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1--- |
2  ; RUN: llc %s -march=x86-64 -run-pass=livedebugvalues -o - | FileCheck %s -implicit-check-not=DBG_VALUE
3
4  ; Check that DBG_VALUE instructions are propagated into a loop with
5  ; diamond pattern but not beyond.
6
7  ; CHECK-LABEL: bb.0.entry:
8  ; CHECK:       DBG_VALUE $ebx, $noreg, !16, !DIExpression()
9  ; CHECK-LABEL: bb.1.bb1:
10  ; CHECK:       DBG_VALUE $eax, $noreg, !16, !DIExpression()
11  ; CHECK-LABEL: bb.2.bb2:
12  ; CHECK:       DBG_VALUE $eax, $noreg, !16, !DIExpression()
13  ; CHECK-LABEL: bb.3.bb3:
14  ; CHECK:       DBG_VALUE $eax, $noreg, !16, !DIExpression()
15  ; CHECK-LABEL: bb.4.bb4:
16  ; CHECK:       DBG_VALUE $eax, $noreg, !16, !DIExpression()
17  ; CHECK-LABEL: bb.5.bb5:
18  ; CHECK:       DBG_VALUE $eax, $noreg, !16, !DIExpression()
19
20  define i32 @_Z8bb_to_bb() local_unnamed_addr !dbg !12 {
21  entry:
22    br label %bb1, !dbg !17
23  bb1:
24    br label %bb2, !dbg !17
25  bb2:
26    br label %bb3, !dbg !17
27  bb3:
28    br label %bb3, !dbg !17
29  bb4:
30    br label %bb3, !dbg !17
31  bb5:
32    ret i32 0, !dbg !17
33  }
34
35  !llvm.dbg.cu = !{!0}
36  !llvm.module.flags = !{!7, !8, !9, !10}
37  !llvm.ident = !{!11}
38  !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !3, debugInfoForProfiling: true, nameTableKind: None)
39  !1 = !DIFile(filename: "main.cpp", directory: "F:\")
40  !2 = !{}
41  !3 = !{!4}
42  !4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())
43  !5 = distinct !DIGlobalVariable(name: "start", scope: !0, file: !1, line: 4, type: !6, isLocal: false, isDefinition: true)
44  !6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
45  !7 = !{i32 2, !"Dwarf Version", i32 4}
46  !8 = !{i32 2, !"Debug Info Version", i32 3}
47  !9 = !{i32 1, !"wchar_size", i32 2}
48  !10 = !{i32 7, !"PIC Level", i32 2}
49  !11 = !{!"clang version 10.0.0"}
50  !12 = distinct !DISubprogram(name: "bb_to_bb", linkageName: "bb_to_bb", scope: !1, file: !1, line: 6, type: !13, scopeLine: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !15)
51  !13 = !DISubroutineType(types: !14)
52  !14 = !{!6, !6}
53  !15 = !{!16}
54  !16 = !DILocalVariable(name: "myVar", scope: !12, file: !1, line: 7, type: !6)
55  !17 = !DILocation(line: 10, scope: !12)
56
57...
58---
59name: _Z8bb_to_bb
60body:  |
61  bb.0.entry:
62    successors: %bb.1
63    $ebx = MOV32ri 0, debug-location !17
64    DBG_VALUE $ebx, $noreg, !16, !DIExpression(), debug-location !17
65  bb.1.bb1:
66    successors: %bb.2, %bb.3
67    $eax = MOV32ri 0, debug-location !17
68    DBG_VALUE $eax, $noreg, !16, !DIExpression(), debug-location !17
69    JCC_1 %bb.3, 4, implicit killed $eflags
70  bb.2.bb2:
71    successors: %bb.4
72    $ebx = MOV32ri 0, debug-location !17
73    JMP_1 %bb.4
74  bb.3.bb3:
75    successors: %bb.4
76    $ebx = MOV32ri 0, debug-location !17
77  bb.4.bb4:
78    successors: %bb.1, %bb.5
79    $ebx = MOV32ri 0, debug-location !17
80    JCC_1 %bb.1, 4, implicit killed $eflags
81  bb.5.bb5:
82    RETQ $eax, debug-location !17
83...
84