src/llvm-project/llvm/test/CodeGen/AArch64/tail-duplicate-debug-variance.mir

# RUN: llc %s -o - -run-pass=early-tailduplication | FileCheck %s --check-prefixes=CHECK,DEBUG
# RUN: llc %s -o - -run-pass=mir-strip-debug,early-tailduplication -mir-strip-debugify-only=0 | FileCheck %s --check-prefix=CHECK

# We should get the same result with and without debug information.
# Specifically, the register class of [[COPY]] should not be changed to
# gpr32common with debug info while staying as gpr32sp without.

--- |
  target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
  target triple = "aarch64-none-linux-gnu"

  define void @test() !dbg !8 {
  entry:
    ret void
  }

  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!2, !3, !4, !5}
  !llvm.ident = !{!6}

  !0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "My compiler", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
  !1 = !DIFile(filename: "foo.c", directory: "/bar")
  !2 = !{i32 7, !"Dwarf Version", i32 4}
  !3 = !{i32 2, !"Debug Info Version", i32 3}
  !4 = !{i32 1, !"wchar_size", i32 1}
  !5 = !{i32 7, !"frame-pointer", i32 2}
  !6 = !{!"My compiler"}
  !7 = !DILocalVariable(name: "i", scope: !8, file: !1, line: 6, type: !12)
  !8 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 5, type: !9, scopeLine: 5, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
  !9 = !DISubroutineType(types: !10)
  !10 = !{null}
  !11 = !{!7}
  !12 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_signed)
  !13 = !DILocation(line: 0, scope: !8)
...
---
name:            test
tracksRegLiveness: true
liveins:         []
body:             |
  ; CHECK-LABEL: name: test
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.2(0x40000000), %bb.1(0x40000000)
  ; CHECK-NEXT:   liveins: $w0, $wzr
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   [[COPY:%[0-9]+]]:gpr32sp = COPY $w0
  ; CHECK-NEXT:   CBNZW $wzr, %bb.2
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   successors: %bb.4(0x80000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $x0 = COPY undef $x0
  ; DEBUG-NEXT:   DBG_VALUE [[COPY]], $noreg, !11, !DIExpression(), debug-location !DILocation(line: 0, scope: !7)
  ; CHECK-NEXT:   [[COPY1:%[0-9]+]]:gpr32 = COPY [[COPY]]
  ; CHECK-NEXT:   B %bb.4
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.2:
  ; CHECK-NEXT:   successors: %bb.4(0x80000000)
  ; CHECK-NEXT: {{  $}}
  ; DEBUG-NEXT:   DBG_VALUE [[COPY]], $noreg, !11, !DIExpression(), debug-location !DILocation(line: 0, scope: !7)
  ; CHECK-NEXT:   [[COPY2:%[0-9]+]]:gpr32 = COPY [[COPY]]
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.4:
  ; CHECK-NEXT:   RET undef $lr, implicit undef $w0
  bb.0:
    successors: %bb.2, %bb.1
    liveins: $w0, $wzr

    %1:gpr32sp = COPY $w0
    CBNZW $wzr, %bb.2

  bb.1:
    successors: %bb.3

    $x0 = COPY undef $x0
    B %bb.3

  bb.2:
    successors: %bb.3

  bb.3:
    successors: %bb.5

    %2:gpr32 = PHI %1, %bb.1, %1, %bb.2
    DBG_VALUE %2, $noreg, !7, !DIExpression(), debug-location !13
    B %bb.5

  bb.4:
    RET undef $lr, implicit undef $w0

  bb.5:
    successors: %bb.4

    B %bb.4
...