# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \
# RUN: -experimental-debug-variable-locations -run-pass=livedebugvalues \
# RUN: | FileCheck %s --check-prefix=CHECK
#
# Test that, in a scenario where tail duplication has duplicated DBG_PHI
# instructions, we can reconstruct the value to refer to. This includes cases
# where the DBG_PHIs refer to the same value, to values that later merge, and
# value that become unavailable.
--- |
; ModuleID = 'before.mir'
source_filename = "test.c"
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"
define dso_local i32 @foo(i64 %bar, i64 %baz) !dbg !7 {
entry:
call void @llvm.dbg.value(metadata i64 %bar, metadata !12, metadata !DIExpression()), !dbg !13
call void @llvm.dbg.value(metadata i64 %baz, metadata !14, metadata !DIExpression()), !dbg !13
call void @ext(i64 %bar), !dbg !15
%add = add nsw i64 %bar, 12, !dbg !16
call void @llvm.dbg.value(metadata i64 %add, metadata !12, metadata !DIExpression()), !dbg !13
call void @ext(i64 %add), !dbg !17
%add1 = add nsw i64 %baz, 1, !dbg !18
call void @llvm.dbg.value(metadata i64 %add1, metadata !14, metadata !DIExpression()), !dbg !13
%call = call i64 @getlong(), !dbg !19
%tobool = icmp ne i64 %call, 0, !dbg !19
br i1 %tobool, label %if.then, label %if.else, !dbg !21
if.then: ; preds = %entry
%add2 = add nsw i64 %add, 1, !dbg !22
call void @llvm.dbg.value(metadata i64 %add2, metadata !12, metadata !DIExpression()), !dbg !13
br label %if.end, !dbg !24
if.else: ; preds = %entry
%add3 = add nsw i64 %add, 2, !dbg !25
call void @llvm.dbg.value(metadata i64 %add3, metadata !12, metadata !DIExpression()), !dbg !13
br label %if.end
if.end: ; preds = %if.else, %if.then
%bar.addr.0 = phi i64 [ %add2, %if.then ], [ %add3, %if.else ], !dbg !27
call void @llvm.dbg.value(metadata i64 %bar.addr.0, metadata !12, metadata !DIExpression()), !dbg !13
%add4 = add nsw i64 %bar.addr.0, %add1, !dbg !28
call void @llvm.dbg.value(metadata i64 %add4, metadata !12, metadata !DIExpression()), !dbg !13
call void @ext(i64 %add4), !dbg !29
%conv = trunc i64 %add4 to i32, !dbg !30
ret i32 %conv, !dbg !31
}
; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.declare(metadata, metadata, metadata)
declare dso_local void @ext(i64)
declare dso_local i64 @getlong()
; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
!1 = !DIFile(filename: "test.c", directory: ".")
!2 = !{}
!3 = !{i32 7, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!"clang"}
!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
!8 = !DISubroutineType(types: !9)
!9 = !{!10, !11, !11}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
!12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 3, type: !11)
!13 = !DILocation(line: 0, scope: !7)
!14 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 3, type: !11)
!15 = !DILocation(line: 4, column: 3, scope: !7)
!16 = !DILocation(line: 5, column: 7, scope: !7)
!17 = !DILocation(line: 6, column: 3, scope: !7)
!18 = !DILocation(line: 7, column: 7, scope: !7)
!19 = !DILocation(line: 9, column: 7, scope: !20)
!20 = distinct !DILexicalBlock(scope: !7, file: !1, line: 9, column: 7)
!21 = !DILocation(line: 9, column: 7, scope: !7)
!22 = !DILocation(line: 10, column: 9, scope: !23)
!23 = distinct !DILexicalBlock(scope: !20, file: !1, line: 9, column: 18)
!24 = !DILocation(line: 11, column: 3, scope: !23)
!25 = !DILocation(line: 12, column: 9, scope: !26)
!26 = distinct !DILexicalBlock(scope: !20, file: !1, line: 11, column: 10)
!27 = !DILocation(line: 0, scope: !20)
!28 = !DILocation(line: 15, column: 7, scope: !7)
!29 = !DILocation(line: 16, column: 3, scope: !7)
!30 = !DILocation(line: 17, column: 10, scope: !7)
!31 = !DILocation(line: 17, column: 3, scope: !7)
...
---
name: foo
alignment: 16
tracksRegLiveness: true
liveins:
- { reg: '$rdi' }
- { reg: '$rsi' }
frameInfo:
stackSize: 24
offsetAdjustment: -24
maxAlignment: 1
adjustsStack: true
hasCalls: true
maxCallFrameSize: 0
cvBytesOfCalleeSavedRegisters: 16
fixedStack:
- { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, callee-saved-register: '$rbx' }
- { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$r14' }
machineFunctionInfo: {}
body: |
bb.0.entry:
successors: %bb.2, %bb.1
liveins: $rdi, $rsi, $r14, $rbx
frame-setup PUSH64r killed $r14, implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 16
frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 24
frame-setup PUSH64r undef $rax, implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 32
CFI_INSTRUCTION offset $rbx, -24
CFI_INSTRUCTION offset $r14, -16
$r14 = MOV64rr $rsi
$rbx = MOV64rr $rdi
CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !15
renamable $rbx = ADD64ri32 killed renamable $rbx, 12, implicit-def $eflags, debug-location !16
$rdi = MOV64rr $rbx, debug-location !17
CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !17
renamable $r14 = ADD64ri32 killed renamable $r14, 1, implicit-def $eflags, debug-location !18
CALL64pcrel32 @getlong, csr_64, implicit $rsp, implicit $ssp, implicit-def $rax, debug-location !19
CMP64ri8 killed renamable $rax, 0, implicit-def $eflags, debug-location !19
JCC_1 %bb.1, 5, implicit $eflags, debug-location !21
bb.2.if.else:
liveins: $rbx, $r14, $rax
renamable $rbx = ADD64ri32 killed renamable $rbx, 2, implicit-def $eflags, debug-location !25
DBG_PHI $r14, 1
DBG_PHI $rbx, 2
DBG_PHI $rax, 3
$rax = MOV64ri 0
JMP_1 %bb.3
bb.1.if.then:
liveins: $rbx, $r14, $rax
renamable $rbx = ADD64ri32 killed renamable $rbx, 1, implicit-def $eflags, debug-location !22
DBG_PHI $r14, 1
DBG_PHI $rbx, 2
DBG_PHI $rax, 3
bb.3.if.end:
liveins: $rbx, $r14
DBG_INSTR_REF 1, 0, !14, !DIExpression(), debug-location !13
DBG_INSTR_REF 2, 0, !12, !DIExpression(), debug-location !13
DBG_INSTR_REF 3, 0, !12, !DIExpression(), debug-location !13
; Value number 1 is live-through the above control flow from the two
; DBG_PHIs:
; CHECK: DBG_INSTR_REF 1, 0
; CHECK-NEXT: DBG_VALUE $r14
;
; While value number 2 has different defs that merge on entry to bb.3.
; These are both in $rbx though, and we should find its location:
; CHECK: DBG_INSTR_REF 2, 0
; CHECK-NEXT: DBG_VALUE $rbx
;
; Value number 3 cannot be resolved because $rax is clobbered in bb.2,
; meaning the merged value in bb.3 is incorrect. It should produce a
; DBG_VALUE $noreg.
; CHECK: DBG_INSTR_REF 3, 0
; CHECK-NEXT: DBG_VALUE $noreg
renamable $rbx = ADD64rr killed renamable $rbx, killed renamable $r14, implicit-def $eflags, debug-location !28
DBG_INSTR_REF 2, 0, !12, !DIExpression(), debug-location !13
; After clobbering rbx, the variable location should not be available.
; CHECK: DBG_INSTR_REF 2, 0
; CHECK-NEXT: DBG_VALUE $noreg
$rdi = MOV64rr $rbx, debug-location !29
CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !29
$eax = MOV32rr $ebx, implicit killed $rbx, debug-location !31
$rsp = frame-destroy ADD64ri8 $rsp, 8, implicit-def dead $eflags, debug-location !31
CFI_INSTRUCTION def_cfa_offset 24, debug-location !31
$rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !31
CFI_INSTRUCTION def_cfa_offset 16, debug-location !31
$r14 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !31
CFI_INSTRUCTION def_cfa_offset 8, debug-location !31
RET64 implicit $eax, debug-location !31
...