test/Transforms/DCE/dbg-value-removal.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -S -passes=redundant-dbg-inst-elim | FileCheck %s

; All dbg.value with location "!dbg !19" are redundant in the input.
; FIXME: We do not handle non-overlapping/overlapping fragments perfectly yet.

define dso_local i16 @main(i16 %a1, i16 %a2) local_unnamed_addr #0 !dbg !7 {
; CHECK-LABEL: @main(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[BB0:%.*]]
; CHECK:       bb0:
; CHECK-NEXT:    call void @llvm.dbg.value(metadata i16 13, metadata !13, metadata !DIExpression()), !dbg !16
; CHECK-NEXT:    call void @llvm.dbg.value(metadata i16 14, metadata !14, metadata !DIExpression()), !dbg !18
; CHECK-NEXT:    call void @llvm.dbg.value(metadata i16 13, metadata !13, metadata !DIExpression()), !dbg !18
; CHECK-NEXT:    call void @llvm.dbg.value(metadata i16 12, metadata !12, metadata !DIExpression()), !dbg !18
; CHECK-NEXT:    br label [[BB1:%.*]]
; CHECK:       bb1:
; CHECK-NEXT:    call void @llvm.dbg.value(metadata i16 [[A1:%.*]], metadata !14, metadata !DIExpression()), !dbg !18
; CHECK-NEXT:    call void @llvm.dbg.value(metadata i16 888, metadata !13, metadata !DIExpression()), !dbg !18
; CHECK-NEXT:    call void @llvm.dbg.value(metadata i16 [[A2:%.*]], metadata !12, metadata !DIExpression()), !dbg !18
; CHECK-NEXT:    [[T1:%.*]] = call i16 @bar(i16 0)
; CHECK-NEXT:    call void @llvm.dbg.value(metadata i16 [[T1]], metadata !13, metadata !DIExpression()), !dbg !18
; CHECK-NEXT:    call void @llvm.dbg.value(metadata i16 [[A2]], metadata !12, metadata !DIExpression(DW_OP_constu, 2, DW_OP_shr, DW_OP_stack_value)), !dbg !18
; CHECK-NEXT:    br label [[BB2:%.*]]
; CHECK:       bb2:
; CHECK-NEXT:    call void @llvm.dbg.value(metadata i16 [[A1]], metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 8)), !dbg !18
; CHECK-NEXT:    call void @llvm.dbg.value(metadata i16 [[A1]], metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 8, 8)), !dbg !18
; CHECK-NEXT:    [[T2:%.*]] = call i16 @bar(i16 [[T1]])
; CHECK-NEXT:    call void @llvm.dbg.value(metadata i16 [[T2]], metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 8)), !dbg !18
; CHECK-NEXT:    call void @llvm.dbg.value(metadata i16 [[A1]], metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 8, 8)), !dbg !19
; CHECK-NEXT:    br label [[BB3:%.*]]
; CHECK:       bb3:
; CHECK-NEXT:    call void @llvm.dbg.value(metadata i16 [[A1]], metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 8)), !dbg !19
; CHECK-NEXT:    call void @llvm.dbg.value(metadata i16 [[A1]], metadata !13, metadata !DIExpression()), !dbg !18
; CHECK-NEXT:    br label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret i16 [[T2]]
;
entry:
  br label %bb0

bb0:
  call void @llvm.dbg.value(metadata i16 999, metadata !12, metadata !DIExpression()), !dbg !19
  call void @llvm.dbg.value(metadata i16 996, metadata !13, metadata !DIExpression()), !dbg !19
  call void @llvm.dbg.value(metadata i16 13, metadata !13, metadata !DIExpression()), !dbg !17
  call void @llvm.dbg.value(metadata i16 998, metadata !12, metadata !DIExpression(DW_OP_constu, 2, DW_OP_shr, DW_OP_stack_value)), !dbg !19
  call void @llvm.dbg.value(metadata i16 14, metadata !14, metadata !DIExpression()), !dbg !16
  call void @llvm.dbg.value(metadata i16 997, metadata !12, metadata !DIExpression()), !dbg !19
  call void @llvm.dbg.value(metadata i16 13, metadata !13, metadata !DIExpression()), !dbg !16
  call void @llvm.dbg.value(metadata i16 12, metadata !12, metadata !DIExpression()), !dbg !16
  br label %bb1

bb1:
  call void @llvm.dbg.value(metadata i16 %a1, metadata !14, metadata !DIExpression()), !dbg !16
  call void @llvm.dbg.value(metadata i16 888, metadata !13, metadata !DIExpression()), !dbg !16
  call void @llvm.dbg.value(metadata i16 %a2, metadata !12, metadata !DIExpression()), !dbg !16
  %t1 = call i16 @bar(i16 0)
  call void @llvm.dbg.value(metadata i16 %a1, metadata !14, metadata !DIExpression()), !dbg !19
  call void @llvm.dbg.value(metadata i16 %t1, metadata !13, metadata !DIExpression()), !dbg !16
  call void @llvm.dbg.value(metadata i16 %a2, metadata !12, metadata !DIExpression(DW_OP_constu, 2, DW_OP_shr, DW_OP_stack_value)), !dbg !16
  br label %bb2

bb2:
  call void @llvm.dbg.value(metadata i16 %a1, metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 8)), !dbg !19
  call void @llvm.dbg.value(metadata i16 %a1, metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 8, 8)), !dbg !19
  call void @llvm.dbg.value(metadata i16 %a1, metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 8)), !dbg !16
  call void @llvm.dbg.value(metadata i16 %a1, metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 8, 8)), !dbg !16
  %t2 = call i16 @bar(i16 %t1)
  call void @llvm.dbg.value(metadata i16 %t2, metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 8)), !dbg !16
  call void @llvm.dbg.value(metadata i16 %a1, metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 8, 8)), !dbg !19
  br label %bb3

bb3:
  call void @llvm.dbg.value(metadata i16 %a1, metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 8)), !dbg !19
  call void @llvm.dbg.value(metadata i16 %a1, metadata !13, metadata !DIExpression()), !dbg !16
  br label %exit

exit:
  ret i16 %t2
}

declare void @llvm.dbg.value(metadata, metadata, metadata) #1
declare i16 @bar(i16) #2

attributes #0 = { noinline nounwind }
attributes #1 = { nounwind readnone speculatable willreturn }
attributes #2 = { noinline nounwind readnone }

!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}

!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !2, nameTableKind: None)
!1 = !DIFile(filename: "foo.c", directory: "")
!2 = !{}
!3 = !{i32 7, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 1}
!6 = !{!"clang version 10.0.0"}
!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 8, type: !8, scopeLine: 8, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
!8 = !DISubroutineType(types: !9)
!9 = !{!10}
!10 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_signed)
!11 = !{!12, !13, !14}
!12 = !DILocalVariable(name: "x", scope: !7, file: !1, line: 9, type: !10)
!13 = !DILocalVariable(name: "y", scope: !7, file: !1, line: 10, type: !10)
!14 = !DILocalVariable(name: "u", scope: !15, file: !1, line: 11, type: !10)
!15 = distinct !DILexicalBlock(scope: !7, file: !1, line: 11, column: 3)
!16 = !DILocation(line: 0, scope: !7)
!17 = !DILocation(line: 0, scope: !7, inlinedAt: !18)
!18 = !DILocation(line: 1, scope: !7)
!19 = !DILocation(line: 77, scope: !7)