--- |
; RUN: llc %s -march=x86-64 -run-pass=livedebugvalues -o - | FileCheck %s -implicit-check-not=DBG_VALUE
; Check that DBG_VALUE instructions are not propagated into a successor block
; of a diamond CFG that clobbers its location.
; CHECK-LABEL: bb.0.entry:
; CHECK: DBG_VALUE $ebx, $noreg, !16, !DIExpression()
; CHECK-LABEL: bb.1.bb1:
; CHECK: DBG_VALUE $ebx, $noreg, !16, !DIExpression()
; CHECK-LABEL: bb.2.bb2:
; CHECK: DBG_VALUE $ebx, $noreg, !16, !DIExpression()
define i32 @_Z8bb_to_bb() local_unnamed_addr !dbg !12 {
entry:
br label %bb1, !dbg !17
bb1:
br label %bb2, !dbg !17
bb2:
br label %bb3, !dbg !17
bb3:
ret i32 0, !dbg !17
}
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!7, !8, !9, !10}
!llvm.ident = !{!11}
!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)
!1 = !DIFile(filename: "main.cpp", directory: "F:\")
!2 = !{}
!3 = !{!4}
!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())
!5 = distinct !DIGlobalVariable(name: "start", scope: !0, file: !1, line: 4, type: !6, isLocal: false, isDefinition: true)
!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!7 = !{i32 2, !"Dwarf Version", i32 4}
!8 = !{i32 2, !"Debug Info Version", i32 3}
!9 = !{i32 1, !"wchar_size", i32 2}
!10 = !{i32 7, !"PIC Level", i32 2}
!11 = !{!"clang version 10.0.0"}
!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)
!13 = !DISubroutineType(types: !14)
!14 = !{!6, !6}
!15 = !{!16}
!16 = !DILocalVariable(name: "myVar", scope: !12, file: !1, line: 7, type: !6)
!17 = !DILocation(line: 10, scope: !12)
...
---
name: _Z8bb_to_bb
body: |
bb.0.entry:
successors: %bb.1, %bb.2
$ebx = MOV32ri 0, debug-location !17
DBG_VALUE $ebx, $noreg, !16, !DIExpression(), debug-location !17
JCC_1 %bb.2, 4, implicit killed $eflags
bb.1.bb1:
successors: %bb.3
$ebx = MOV32ri 0, debug-location !17
JMP_1 %bb.3
bb.2.bb2:
successors: %bb.3
$eax = MOV32ri 0, debug-location !17
bb.3.bb3:
RET64 $eax, debug-location !17
...
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