llvm/test/CodeGen/AArch64/GlobalISel/salvage-debug-info-dead.mir

# RUN: llc -global-isel=1 -O0 -run-pass=aarch64-O0-prelegalizer-combiner %s -o - -verify-machineinstrs | FileCheck %s --check-prefix=CHECK

--- |
  ; ModuleID = 'salvage-debug-info-dead.mir'
  target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
  target triple = "aarch64--"

  @A = global i8 1234

  declare external i128 @foo()

  define void @main() !dbg !6 {
    ret void
  }

  !llvm.dbg.cu = !{!2}
  !llvm.module.flags = !{!10, !11, !12}
  !llvm.ident = !{!20}

  !1 = distinct !DIGlobalVariable(name: "A", scope: !2, file: !3, line: 1, type: !7, isLocal: false, isDefinition: true)
  !2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !3, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
  !3 = !DIFile(filename: "test.ll", directory: "/")
  !7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
  !8 = !DISubroutineType(types: !23)
  !9 = distinct !DIGlobalVariable(name: "C", scope: !2, file: !3, line: 3, type: !7, isLocal: false, isDefinition: true)
  !10 = !{i32 7, !"Dwarf Version", i32 4}
  !11 = !{i32 2, !"Debug Info Version", i32 3}
  !12 = !{i32 1, !"wchar_size", i32 4}
  !20 = !{!"clang"}
  !6 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 5, type: !8, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !24)
  !23 = !{!7}
  !24 = !{}
  !25 = !DILocalVariable(name: "X", scope: !6, file: !3, line: 6, type: !7)
  !42 = !DILocalVariable(name: "Y", scope: !6, file: !3, line: 12, type: !7)
  !52 = !DILocalVariable(name: "Z", scope: !6, file: !3, line: 16, type: !7)
  !56 = !DILocalVariable(name: "W", scope: !6, file: !3, line: 18, type: !7)
  !57 = !DILocalVariable(name: "P", scope: !6, file: !3, line: 18, type: !7)
...
---
# Check that we salvage debug information for instructions
# deleted as dead in Combiner pass
name: main
tracksRegLiveness: true
body:             |
  ; CHECK-LABEL: name: main
  ; CHECK: bb.0:
  ; CHECK:   liveins: $x0
  ; CHECK-NEXT: {{   $}}
  ; CHECK-NEXT:   DBG_VALUE $x0, $noreg, {{.*}}, !DIExpression(DW_OP_LLVM_convert, 64, DW_ATE_unsigned, DW_OP_LLVM_convert, 32, DW_ATE_unsigned, DW_OP_stack_value), debug-location !DILocation(line: 6, column: 7, scope: !6)
  ; CHECK-NEXT:   DBG_VALUE $x0, $noreg, {{.*}}, !DIExpression(DW_OP_LLVM_convert, 64, DW_ATE_unsigned, DW_OP_LLVM_convert, 32, DW_ATE_unsigned, DW_OP_LLVM_convert, 32, DW_ATE_unsigned, DW_OP_LLVM_convert, 16, DW_ATE_unsigned, DW_OP_stack_value), debug-location !DILocation(line: 7, column: 7, scope: !6)
  ; CHECK-NEXT:   DBG_VALUE $x0, $noreg, {{.*}}, !DIExpression(DW_OP_LLVM_convert, 64, DW_ATE_unsigned, DW_OP_LLVM_convert, 32, DW_ATE_unsigned, DW_OP_LLVM_convert, 32, DW_ATE_unsigned, DW_OP_LLVM_convert, 16, DW_ATE_unsigned, DW_OP_LLVM_convert, 16, DW_ATE_unsigned, DW_OP_LLVM_convert, 8, DW_ATE_unsigned, DW_OP_stack_value), debug-location !DILocation(line: 8, column: 7, scope: !6)
  ; CHECK: bb.1:
  ; CHECK-NEXT:   DBG_VALUE $x0, $noreg, {{.*}}, !DIExpression(DW_OP_LLVM_convert, 64, DW_ATE_unsigned, DW_OP_LLVM_convert, 32, DW_ATE_unsigned, DW_OP_stack_value), debug-location !DILocation(line: 9, column: 7, scope: !6)
  ; CHECK-NEXT:   DBG_VALUE %4:_(s32), 0, {{.*}}, !DIExpression(), debug-location !DILocation(line: 9, column: 7, scope: !6)
  bb.0:
    liveins: $x0
    %0:_(s64) = COPY $x0
    %1:_(s32) = G_TRUNC %0:_(s64)
    DBG_VALUE %1:_(s32), $noreg, !25, !DIExpression(), debug-location !DILocation(line: 6, column: 7, scope: !6)

    %2:_(s16) = G_TRUNC %1:_(s32)
    DBG_VALUE %2:_(s16), $noreg, !42, !DIExpression(), debug-location !DILocation(line: 7, column: 7, scope: !6)

    %3:_(s8) = G_TRUNC %2:_(s16)
    DBG_VALUE %3:_(s8), $noreg, !52, !DIExpression(), debug-location !DILocation(line: 8, column: 7, scope: !6)

  bb.1:
    %4:_(s32) = G_TRUNC %0:_(s64)
    DBG_VALUE %4:_(s32), $noreg, !56, !DIExpression(), debug-location !DILocation(line: 9, column: 7, scope: !6)
    DBG_VALUE %4:_(s32), 0, !57, !DIExpression(), debug-location !DILocation(line: 9, column: 7, scope: !6)

...