# RUN: llc -run-pass=livedebugvalues %s -o - -experimental-debug-variable-locations | FileCheck %s --check-prefixes=CHECK
# Test that we do not drop debug values when joining a VPHI and a Def that use
# the same value.
# In this test case, the live out value for "a" from bb.4 is a VPHI with a
# defined value, the value live-in register $esi at bb.3. In bb.5, we also have
# a DBG_INSTR_REF that explicitly defines "a" as holding that same value. When
# joining these values to determine the live-in value of "a" at bb.6, we should
# recognize that these values are identical and produce a valid live-in debug
# value.
# CHECK: ![[VAR:[0-9]+]] = !DILocalVariable(name: "a"
# CHECK-LABEL: bb.6
# CHECK: DBG_VALUE_LIST ![[VAR]], !DIExpression(DW_OP_LLVM_arg, 0), $esi
--- |
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @"?foo@@YAHH@Z"(i32 noundef %0) local_unnamed_addr #0 !dbg !8 {
call void @llvm.dbg.value(metadata i32 %0, metadata !14, metadata !DIExpression()), !dbg !16
%2 = tail call noundef i32 @"?bar@@YAHXZ"(), !dbg !17
br label %3, !dbg !18
3: ; preds = %13, %1
%4 = phi i32 [ %0, %1 ], [ %14, %13 ]
%5 = phi i32 [ %2, %1 ], [ %7, %13 ], !dbg !16
call void @llvm.dbg.value(metadata i32 %4, metadata !14, metadata !DIExpression()), !dbg !16
%6 = tail call noundef i32 @"?bar@@YAHXZ"(), !dbg !19
%7 = sub nsw i32 %5, %6, !dbg !19
%8 = srem i32 %7, 3, !dbg !21
%9 = icmp eq i32 %8, 0, !dbg !21
br i1 %9, label %10, label %13, !dbg !21
10: ; preds = %3
%11 = tail call noundef i32 @"?bar@@YAHXZ"(), !dbg !22
%12 = add nsw i32 %11, %4, !dbg !22
call void @llvm.dbg.value(metadata i32 %12, metadata !14, metadata !DIExpression()), !dbg !16
br label %13, !dbg !25
13: ; preds = %10, %3
%14 = phi i32 [ %12, %10 ], [ %4, %3 ]
call void @llvm.dbg.value(metadata i32 %14, metadata !14, metadata !DIExpression()), !dbg !16
%15 = icmp sgt i32 %7, 0, !dbg !26
br i1 %15, label %3, label %16, !dbg !26, !llvm.loop !27
16: ; preds = %13
%17 = and i32 %7, 1, !dbg !30
%18 = icmp eq i32 %17, 0, !dbg !30
br i1 %18, label %19, label %22, !dbg !30
19: ; preds = %16
%20 = tail call noundef i32 @"?bar@@YAHXZ"(), !dbg !31
%21 = add nsw i32 %20, %14, !dbg !31
call void @llvm.dbg.value(metadata i32 %21, metadata !14, metadata !DIExpression()), !dbg !16
br label %22, !dbg !34
22: ; preds = %19, %16
%23 = phi i32 [ %21, %19 ], [ %14, %16 ], !dbg !16
call void @llvm.dbg.value(metadata i32 %23, metadata !14, metadata !DIExpression()), !dbg !16
ret i32 %23, !dbg !35
}
declare dso_local noundef i32 @"?bar@@YAHXZ"() local_unnamed_addr #1
; Function Attrs: nocallback nofree nosync nounwind readnone speculatable willreturn
declare void @llvm.dbg.value(metadata, metadata, metadata) #2
attributes #0 = { mustprogress uwtable "frame-pointer"="none" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { "frame-pointer"="none" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #2 = { nocallback nofree nosync nounwind readnone speculatable willreturn }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5, !6}
!llvm.ident = !{!7}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 15.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
!1 = !DIFile(filename: "test.cpp", directory: "\")
!3 = !{i32 2, !"Debug Info Version", i32 3}
!4 = !{i32 1, !"wchar_size", i32 2}
!5 = !{i32 7, !"PIC Level", i32 2}
!6 = !{i32 7, !"uwtable", i32 2}
!7 = !{!"clang version 15.0.0"}
!8 = distinct !DISubprogram(name: "foo", linkageName: "?foo@@YAHH@Z", scope: !9, file: !9, line: 3, type: !10, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !13)
!9 = !DIFile(filename: ".\\test.cpp", directory: "\")
!10 = !DISubroutineType(types: !11)
!11 = !{!12, !12}
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!13 = !{!14}
!14 = !DILocalVariable(name: "a", arg: 1, scope: !8, file: !9, line: 3, type: !12)
!16 = !DILocation(line: 0, scope: !8)
!17 = !DILocation(line: 4, scope: !8)
!18 = !DILocation(line: 5, scope: !8)
!19 = !DILocation(line: 6, scope: !20)
!20 = distinct !DILexicalBlock(scope: !8, file: !9, line: 5)
!21 = !DILocation(line: 7, scope: !20)
!22 = !DILocation(line: 8, scope: !23)
!23 = distinct !DILexicalBlock(scope: !24, file: !9, line: 7)
!24 = distinct !DILexicalBlock(scope: !20, file: !9, line: 7)
!25 = !DILocation(line: 9, scope: !23)
!26 = !DILocation(line: 10, scope: !20)
!27 = distinct !{!27, !18, !28, !29}
!28 = !DILocation(line: 10, scope: !8)
!29 = !{!"llvm.loop.mustprogress"}
!30 = !DILocation(line: 11, scope: !8)
!31 = !DILocation(line: 12, scope: !32)
!32 = distinct !DILexicalBlock(scope: !33, file: !9, line: 11)
!33 = distinct !DILexicalBlock(scope: !8, file: !9, line: 11)
!34 = !DILocation(line: 13, scope: !32)
!35 = !DILocation(line: 14, scope: !8)
...
---
name: '?foo@@YAHH@Z'
alignment: 16
exposesReturnsTwice: false
legalized: false
regBankSelected: false
selected: false
failedISel: false
tracksRegLiveness: true
hasWinCFI: true
callsEHReturn: false
callsUnwindInit: false
hasEHCatchret: false
hasEHScopes: false
hasEHFunclets: false
failsVerification: false
tracksDebugUserValues: true
debugInstrRef: true
registers: []
liveins:
- { reg: '$ecx', virtual-reg: '' }
frameInfo:
isFrameAddressTaken: false
isReturnAddressTaken: false
hasStackMap: false
hasPatchPoint: false
stackSize: 56
offsetAdjustment: -56
maxAlignment: 8
adjustsStack: true
hasCalls: true
stackProtector: ''
functionContext: ''
maxCallFrameSize: 32
cvBytesOfCalleeSavedRegisters: 16
hasOpaqueSPAdjustment: false
hasVAStart: false
hasMustTailInVarArgFunc: false
hasTailCall: false
localFrameSize: 0
savePoint: ''
restorePoint: ''
fixedStack:
- { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: default,
callee-saved-register: '$rdi', callee-saved-restored: true, debug-info-variable: '',
debug-info-expression: '', debug-info-location: '' }
- { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default,
callee-saved-register: '$rsi', callee-saved-restored: true, debug-info-variable: '',
debug-info-expression: '', debug-info-location: '' }
stack: []
callSites: []
debugValueSubstitutions: []
constants: []
machineFunctionInfo: {}
body: |
bb.0 (%ir-block.1):
successors: %bb.1(0x80000000)
liveins: $ecx, $rsi, $rdi
DBG_VALUE $ecx, $noreg, !14, !DIExpression(), debug-location !16
frame-setup PUSH64r killed $rsi, implicit-def $rsp, implicit $rsp
frame-setup SEH_PushReg 57
frame-setup PUSH64r killed $rdi, implicit-def $rsp, implicit $rsp
frame-setup SEH_PushReg 53
$rsp = frame-setup SUB64ri8 $rsp, 40, implicit-def dead $eflags
frame-setup SEH_StackAlloc 40
frame-setup SEH_EndPrologue
$esi = MOV32rr $ecx
CALL64pcrel32 @"?bar@@YAHXZ", csr_win64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-instr-number 8, debug-location !17
$edi = MOV32rr $eax, debug-location !17
JMP_1 %bb.1
bb.3 (%ir-block.13, align 16):
successors: %bb.1(0x7c000000), %bb.4(0x04000000)
liveins: $edi, $esi
DBG_PHI $esi, 5
TEST32rr renamable $edi, renamable $edi, implicit-def $eflags, debug-location !26
JCC_1 %bb.4, 14, implicit $eflags, debug-location !26
bb.1 (%ir-block.3):
successors: %bb.2(0x30000000), %bb.3(0x50000000)
liveins: $edi, $esi
DBG_PHI $esi, 3
DBG_PHI $edi, 2
DBG_INSTR_REF !14, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(3, 0), debug-location !16
CALL64pcrel32 @"?bar@@YAHXZ", csr_win64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !19
renamable $edi = nsw SUB32rr killed renamable $edi, killed renamable $eax, implicit-def dead $eflags, debug-instr-number 1, debug-location !19
renamable $eax = IMUL32rri renamable $edi, -1431655765, implicit-def dead $eflags, debug-location !21
renamable $eax = ADD32ri killed renamable $eax, 715827882, implicit-def dead $eflags, debug-location !21
CMP32ri killed renamable $eax, 1431655764, implicit-def $eflags, debug-location !21
JCC_1 %bb.3, 7, implicit $eflags, debug-location !21
bb.2 (%ir-block.10):
successors: %bb.3(0x80000000)
liveins: $edi, $esi
CALL64pcrel32 @"?bar@@YAHXZ", csr_win64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !22
renamable $esi = nsw ADD32rr killed renamable $esi, killed renamable $eax, implicit-def dead $eflags, debug-instr-number 4, debug-location !22
DBG_INSTR_REF !14, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(4, 0), debug-location !16
JMP_1 %bb.3
bb.4 (%ir-block.16):
successors: %bb.5(0x40000000), %bb.6(0x40000000)
liveins: $edi, $esi
TEST8ri renamable $dil, 1, implicit-def $eflags, implicit killed $edi, debug-location !30
JCC_1 %bb.6, 5, implicit $eflags, debug-location !30
bb.5 (%ir-block.19):
successors: %bb.6(0x80000000)
liveins: $esi
CALL64pcrel32 @"?bar@@YAHXZ", csr_win64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !31
DBG_INSTR_REF !14, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(5, 0), debug-location !16
bb.6 (%ir-block.22):
liveins: $esi
$eax = MOV32rr killed $esi, debug-location !35
SEH_Epilogue debug-location !35
$rsp = frame-destroy ADD64ri8 $rsp, 40, implicit-def dead $eflags, debug-location !35
$rdi = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !35
$rsi = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !35
RET64 $eax, debug-location !35
...
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