Created
July 14, 2020 17:30
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--- | | |
; RUN: llc %s -march=x86-64 -run-pass=livedebugvalues -o - -experimental-debug-variable-locations | FileCheck %s -implicit-check-not=DBG_VALUE | |
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: | |
br label %bb3, !dbg !17 | |
bb4: | |
br label %bb3, !dbg !17 | |
bb5: | |
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 | |
$ebx = MOV32ri 0, debug-location !17 | |
$eax = COPY $ebx | |
DBG_VALUE $eax, $noreg, !16, !DIExpression(), debug-location !17 | |
bb.1.bb1: | |
successors: %bb.2, %bb.3 | |
$eax = COPY $ebx, debug-location !17 | |
$ebx = COPY $ecx, debug-location !17 | |
DBG_VALUE $ebx, $noreg, !16, !DIExpression(), debug-location !17 | |
JCC_1 %bb.3, 4, implicit killed $eflags | |
bb.2.bb2: | |
successors: %bb.4 | |
JMP_1 %bb.4 | |
bb.3.bb3: | |
successors: %bb.4 | |
bb.4.bb4: | |
successors: %bb.1, %bb.5 | |
JCC_1 %bb.1, 4, implicit killed $eflags | |
bb.5.bb5: | |
RETQ $eax, debug-location !17 | |
... |
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Single loop in this file, with diamond control flow at the end of it before looping back. Using the command line:
build/bin/llc llvm/test/DebugInfo/MIR/InstrRef/livedebugvalues_downgradefeedback_loop.mir -march=x86-64 -run-pass=livedebugvalues -o -
There's no live-in variable location for block one. Turning on
-experimental-debug-variable-locations
, a live-in location in bb1 is given of $eax, which isn't correct.