# RUN: llc %s -o - -experimental-debug-variable-locations=true \
# RUN: -run-pass=livedebugvalues | \
# RUN: FileCheck %s --implicit-check-not=DBG_VALUE
#
## Check that LiveDebugValues can track and join DBG_INSTR_REFs that use
## registers, stack slots, and constants in a single instruction.
#
# CHECK: ![[VAR_D:[0-9]+]] = !DILocalVariable(name: "d"
# CHECK-LABEL: bb.0.entry
#
## Value at end of first block should use the registers given by DBG_PHI, and
## fold the offset+deref from stack slot [$rsp+12] into the expression.
# CHECK: DBG_VALUE_LIST ![[VAR_D]]
# CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus_uconst, 12, DW_OP_deref, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value)
# CHECK-SAME: $ebp, $rsp, $ebx, 6
# CHECK-LABEL: bb.1.while.body
#
## Prior DBG_VALUE_LIST should be live-in to this bb.1.
# CHECK: DBG_VALUE_LIST ![[VAR_D]]
# CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus_uconst, 12, DW_OP_deref, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value)
# CHECK-SAME: $ebp, $rsp, $ebx, 6
#
## When $ebp is spilled to a stack slot, a new debug value using the stack slot
## should be inserted.
# CHECK: MOV32mr $rsp, {{.+}} $ebp
# CHECK-NEXT: DBG_VALUE_LIST ![[VAR_D]]
# CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_plus_uconst, 16, DW_OP_deref, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus_uconst, 12, DW_OP_deref, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value)
# CHECK-SAME: $rsp, $rsp, $ebx, 6
#
## Similarly produce a new debug value when $ebx is spilled.
# CHECK: MOV32mr $rsp, {{.+}} $ebx
# CHECK-NEXT: DBG_VALUE_LIST ![[VAR_D]]
# CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_plus_uconst, 16, DW_OP_deref, DW_OP_LLVM_arg, 2, DW_OP_plus_uconst, 20, DW_OP_deref, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus_uconst, 12, DW_OP_deref, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value)
# CHECK-SAME: $rsp, $rsp, $rsp, 6
#
## When the value in the stack slot is restored and then that slot is clobbered, the debug value should use the restored register.
# CHECK: MOV32mi $rsp
# CHECK-NEXT: DBG_VALUE_LIST ![[VAR_D]]
# CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_plus_uconst, 16, DW_OP_deref, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus_uconst, 12, DW_OP_deref, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value)
# CHECK-SAME: $rsp, $rsp, $ebx, 6
#
## Repeat for the next stack slot that gets restored and then clobbered.
# CHECK: MOV32mi $rsp
# CHECK-NEXT: DBG_VALUE_LIST ![[VAR_D]]
# CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus_uconst, 12, DW_OP_deref, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value)
# CHECK-SAME: $ebp, $rsp, $ebx, 6
#
## TODO: The debug value range should be terminated when the value in $ebx is clobbered.
#
## At the end of the block a new DBG_INSTR_REF begins a new range.
# CHECK: DBG_VALUE_LIST ![[VAR_D]]
# CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus_uconst, 12, DW_OP_deref, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value)
# CHECK-SAME: $ebp, $rsp, $ebx, 6
# CHECK-LABEL: bb.2.while.end
#
## Finally, the two entry debug values should be joined, as they have identical
## expressions, their respective stack slots and constants are identical, and
## the remaining operands occupy the same registers out of each block.
# CHECK: DBG_VALUE_LIST ![[VAR_D]]
# CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus_uconst, 12, DW_OP_deref, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value)
# CHECK-SAME: $ebp, $rsp, $ebx, 6
--- |
; ModuleID = 'test.ll'
source_filename = "test.cpp"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-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 @_Z3fooii(i32 noundef %a, i32 noundef %b) local_unnamed_addr !dbg !9 {
entry:
%call = tail call noundef i32 @_Z3bazv(), !dbg !18
call void @llvm.dbg.value(metadata !DIArgList(i32 %a, i32 %call, i32 %b), metadata !17, metadata !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus, DW_OP_constu, 6, DW_OP_minus, DW_OP_stack_value)), !dbg !19
%cmp19 = icmp sgt i32 %b, %a, !dbg !20
br i1 %cmp19, label %while.body.preheader, label %while.end, !dbg !21
while.body.preheader: ; preds = %entry
br label %while.body, !dbg !21
while.body: ; preds = %while.body.preheader, %while.body
%a.addr.021 = phi i32 [ %mul3, %while.body ], [ %a, %while.body.preheader ]
%b.addr.020 = phi i32 [ %add2, %while.body ], [ %b, %while.body.preheader ]
%call1 = tail call noundef i32 @_Z3bazv(), !dbg !22
tail call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"() #3, !dbg !24, !srcloc !25
%add2 = add i32 %b.addr.020, 2, !dbg !26
%mul3 = shl nsw i32 %a.addr.021, 1, !dbg !27
call void @llvm.dbg.value(metadata !DIArgList(i32 %mul3, i32 %call, i32 %add2), metadata !17, metadata !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus, DW_OP_constu, 6, DW_OP_minus, DW_OP_stack_value)), !dbg !19
%cmp = icmp sgt i32 %add2, %mul3, !dbg !20
br i1 %cmp, label %while.body, label %while.end, !dbg !21, !llvm.loop !28
while.end: ; preds = %while.body, %entry
%b.addr.0.lcssa = phi i32 [ %b, %entry ], [ %add2, %while.body ]
%a.addr.0.lcssa = phi i32 [ %a, %entry ], [ %mul3, %while.body ]
%add7 = sub i32 %b.addr.0.lcssa, %call, !dbg !31
%sub8 = add i32 %add7, %a.addr.0.lcssa, !dbg !32
ret i32 %sub8, !dbg !33
}
declare !dbg !34 noundef i32 @_Z3bazv() local_unnamed_addr
; Function Attrs: nocallback nofree nosync nounwind readnone speculatable willreturn
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!2, !3, !4, !5, !6, !7}
!llvm.ident = !{!8}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 16.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
!1 = !DIFile(filename: "test.cpp", directory: "/")
!2 = !{i32 7, !"Dwarf Version", i32 5}
!3 = !{i32 2, !"Debug Info Version", i32 3}
!4 = !{i32 1, !"wchar_size", i32 4}
!5 = !{i32 8, !"PIC Level", i32 2}
!6 = !{i32 7, !"PIE Level", i32 2}
!7 = !{i32 7, !"uwtable", i32 2}
!8 = !{!"clang version 16.0.0"}
!9 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fooii", scope: !1, file: !1, line: 3, type: !10, scopeLine: 3, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !13)
!10 = !DISubroutineType(types: !11)
!11 = !{!12, !12, !12}
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!13 = !{!14, !15, !16, !17}
!14 = !DILocalVariable(name: "a", arg: 1, scope: !9, file: !1, line: 3, type: !12)
!15 = !DILocalVariable(name: "b", arg: 2, scope: !9, file: !1, line: 3, type: !12)
!16 = !DILocalVariable(name: "c", scope: !9, file: !1, line: 4, type: !12)
!17 = !DILocalVariable(name: "d", scope: !9, file: !1, line: 5, type: !12)
!18 = !DILocation(line: 4, column: 11, scope: !9)
!19 = !DILocation(line: 0, scope: !9)
!20 = !DILocation(line: 6, column: 12, scope: !9)
!21 = !DILocation(line: 6, column: 3, scope: !9)
!22 = !DILocation(line: 7, column: 5, scope: !23)
!23 = distinct !DILexicalBlock(scope: !9, file: !1, line: 6, column: 17)
!24 = !DILocation(line: 9, column: 5, scope: !23)
!25 = !{i64 129}
!26 = !DILocation(line: 8, column: 7, scope: !23)
!27 = !DILocation(line: 10, column: 7, scope: !23)
!28 = distinct !{!28, !21, !29, !30}
!29 = !DILocation(line: 12, column: 3, scope: !9)
!30 = !{!"llvm.loop.mustprogress"}
!31 = !DILocation(line: 13, column: 12, scope: !9)
!32 = !DILocation(line: 13, column: 16, scope: !9)
!33 = !DILocation(line: 13, column: 3, scope: !9)
!34 = !DISubprogram(name: "baz", linkageName: "_Z3bazv", scope: !1, file: !1, line: 1, type: !35, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !37)
!35 = !DISubroutineType(types: !36)
!36 = !{!12}
!37 = !{}
...
---
name: _Z3fooii
alignment: 16
tracksRegLiveness: true
tracksDebugUserValues: true
debugInstrRef: true
registers: []
liveins:
- { reg: '$edi', virtual-reg: '' }
- { reg: '$esi', virtual-reg: '' }
frameInfo:
stackSize: 72
offsetAdjustment: -72
maxAlignment: 4
adjustsStack: true
hasCalls: true
stackProtector: ''
functionContext: ''
cvBytesOfCalleeSavedRegisters: 48
savePoint: ''
restorePoint: ''
fixedStack:
- { id: 0, type: spill-slot, offset: -56, size: 8, alignment: 8, stack-id: default,
callee-saved-register: '$rbx', callee-saved-restored: true, debug-info-variable: '',
debug-info-expression: '', debug-info-location: '' }
- { id: 1, type: spill-slot, offset: -48, size: 8, alignment: 16, stack-id: default,
callee-saved-register: '$r12', callee-saved-restored: true, debug-info-variable: '',
debug-info-expression: '', debug-info-location: '' }
- { id: 2, type: spill-slot, offset: -40, size: 8, alignment: 8, stack-id: default,
callee-saved-register: '$r13', callee-saved-restored: true, debug-info-variable: '',
debug-info-expression: '', debug-info-location: '' }
- { id: 3, type: spill-slot, offset: -32, size: 8, alignment: 16, stack-id: default,
callee-saved-register: '$r14', callee-saved-restored: true, debug-info-variable: '',
debug-info-expression: '', debug-info-location: '' }
- { id: 4, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: default,
callee-saved-register: '$r15', callee-saved-restored: true, debug-info-variable: '',
debug-info-expression: '', debug-info-location: '' }
- { id: 5, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default,
callee-saved-register: '$rbp', callee-saved-restored: true, debug-info-variable: '',
debug-info-expression: '', debug-info-location: '' }
stack:
- { id: 0, name: '', type: spill-slot, offset: -60, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 1, name: '', type: spill-slot, offset: -64, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 2, name: '', type: spill-slot, offset: -68, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
callSites: []
debugValueSubstitutions: []
constants: []
machineFunctionInfo: {}
body: |
bb.0.entry:
successors: %bb.1(0x78e38e39), %bb.3(0x071c71c7)
liveins: $edi, $esi, $rbp, $r15, $r14, $r13, $r12, $rbx
frame-setup PUSH64r killed $rbp, implicit-def $rsp, implicit $rsp
frame-setup CFI_INSTRUCTION def_cfa_offset 16
frame-setup PUSH64r killed $r15, implicit-def $rsp, implicit $rsp
frame-setup CFI_INSTRUCTION def_cfa_offset 24
frame-setup PUSH64r killed $r14, implicit-def $rsp, implicit $rsp
frame-setup CFI_INSTRUCTION def_cfa_offset 32
frame-setup PUSH64r killed $r13, implicit-def $rsp, implicit $rsp
frame-setup CFI_INSTRUCTION def_cfa_offset 40
frame-setup PUSH64r killed $r12, implicit-def $rsp, implicit $rsp
frame-setup CFI_INSTRUCTION def_cfa_offset 48
frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp
frame-setup CFI_INSTRUCTION def_cfa_offset 56
$rsp = frame-setup SUB64ri8 $rsp, 24, implicit-def dead $eflags
frame-setup CFI_INSTRUCTION def_cfa_offset 80
CFI_INSTRUCTION offset $rbx, -56
CFI_INSTRUCTION offset $r12, -48
CFI_INSTRUCTION offset $r13, -40
CFI_INSTRUCTION offset $r14, -32
CFI_INSTRUCTION offset $r15, -24
CFI_INSTRUCTION offset $rbp, -16
DBG_PHI $esi, 5
DBG_PHI $edi, 3
$ebx = MOV32rr $esi
$ebp = MOV32rr $edi
CALL64pcrel32 target-flags(x86-plt) @_Z3bazv, csr_64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-instr-number 4, debug-location !18
MOV32mr $rsp, 1, $noreg, 12, $noreg, $eax :: (store (s32) into %stack.2)
DBG_INSTR_REF !17, !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value), dbg-instr-ref(3, 0), dbg-instr-ref(4, 6), dbg-instr-ref(5, 0), 6, debug-location !19
CMP32rr renamable $ebx, renamable $ebp, implicit-def $eflags, debug-location !20
JCC_1 %bb.3, 14, implicit $eflags, debug-location !21
bb.1.while.body (align 16):
successors: %bb.1(0x78e38e39), %bb.3(0x071c71c7)
liveins: $ebp, $ebx
MOV32mr $rsp, 1, $noreg, 16, $noreg, killed renamable $ebp :: (store (s32) into %stack.1)
MOV32mr $rsp, 1, $noreg, 20, $noreg, killed renamable $ebx :: (store (s32) into %stack.0)
CALL64pcrel32 target-flags(x86-plt) @_Z3bazv, csr_64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def dead $eax, debug-location !22
INLINEASM &"", 1 /* sideeffect attdialect */, 12 /* clobber */, implicit-def dead early-clobber $rax, 12 /* clobber */, implicit-def dead early-clobber $rbx, 12 /* clobber */, implicit-def dead early-clobber $rcx, 12 /* clobber */, implicit-def dead early-clobber $rdx, 12 /* clobber */, implicit-def dead early-clobber $rsi, 12 /* clobber */, implicit-def dead early-clobber $rdi, 12 /* clobber */, implicit-def dead early-clobber $rbp, 12 /* clobber */, implicit-def dead early-clobber $r8, 12 /* clobber */, implicit-def dead early-clobber $r9, 12 /* clobber */, implicit-def dead early-clobber $r10, 12 /* clobber */, implicit-def dead early-clobber $r11, 12 /* clobber */, implicit-def dead early-clobber $r12, 12 /* clobber */, implicit-def dead early-clobber $r13, 12 /* clobber */, implicit-def dead early-clobber $r14, 12 /* clobber */, implicit-def dead early-clobber $r15, 12 /* clobber */, implicit-def dead early-clobber $df, 12 /* clobber */, implicit-def early-clobber $fpsw, 12 /* clobber */, implicit-def dead early-clobber $eflags, !25, debug-location !24
renamable $ebp = MOV32rm $rsp, 1, $noreg, 16, $noreg :: (load (s32) from %stack.1)
renamable $ebx = MOV32rm $rsp, 1, $noreg, 20, $noreg :: (load (s32) from %stack.0)
MOV32mi $rsp, 1, $noreg, 20, $noreg, 0 :: (store (s32) into %stack.0)
MOV32mi $rsp, 1, $noreg, 16, $noreg, 0 :: (store (s32) into %stack.1)
renamable $ebx = ADD32ri8 killed renamable $ebx, 2, implicit-def dead $eflags, debug-instr-number 2, debug-location !26
renamable $ebp = nsw ADD32rr killed renamable $ebp, renamable $ebp, implicit-def dead $eflags, debug-instr-number 1, debug-location !27
DBG_INSTR_REF !17, !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value), dbg-instr-ref(1, 0), dbg-instr-ref(4, 6), dbg-instr-ref(2, 0), 6, debug-location !19
CMP32rr renamable $ebx, renamable $ebp, implicit-def $eflags, debug-location !20
JCC_1 %bb.1, 15, implicit $eflags, debug-location !21
bb.3.while.end:
liveins: $ebp, $ebx
renamable $ebx = SUB32rm killed renamable $ebx, $rsp, 1, $noreg, 12, $noreg, implicit-def dead $eflags, debug-location !31 :: (load (s32) from %stack.2)
renamable $ebx = ADD32rr killed renamable $ebx, killed renamable $ebp, implicit-def dead $eflags, debug-location !32
$eax = MOV32rr killed $ebx, debug-location !33
$rsp = frame-destroy ADD64ri8 $rsp, 24, implicit-def dead $eflags, debug-location !33
frame-destroy CFI_INSTRUCTION def_cfa_offset 56, debug-location !33
$rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !33
frame-destroy CFI_INSTRUCTION def_cfa_offset 48, debug-location !33
$r12 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !33
frame-destroy CFI_INSTRUCTION def_cfa_offset 40, debug-location !33
$r13 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !33
frame-destroy CFI_INSTRUCTION def_cfa_offset 32, debug-location !33
$r14 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !33
frame-destroy CFI_INSTRUCTION def_cfa_offset 24, debug-location !33
$r15 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !33
frame-destroy CFI_INSTRUCTION def_cfa_offset 16, debug-location !33
$rbp = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !33
frame-destroy CFI_INSTRUCTION def_cfa_offset 8, debug-location !33
RET64 $eax, debug-location !33
...
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