llvm/llvm/test/DebugInfo/MIR/InstrRef/livedebugvalues_stackslot_subregs.mir

# RUN: llc %s -march=x86-64 -run-pass=livedebugvalues -experimental-debug-variable-locations -o - 2>&1 | FileCheck %s
#
# Test that we can spill and restore through subregisters too. In this test,
# eax is def'd and then spilt, but as part of a larger register.
--- |
  define i8 @test(i32 %bar) local_unnamed_addr !dbg !7 {
  entry:
    ret i8 0, !dbg !12
  }

  declare dso_local void @ext(i64)

  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!3, !4, !5, !6}
  !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
  !1 = !DIFile(filename: "foo.cpp", directory: ".")
  !2 = !DIBasicType(name: "int", size: 8, encoding: DW_ATE_signed)
  !3 = !{i32 2, !"Dwarf Version", i32 4}
  !4 = !{i32 2, !"Debug Info Version", i32 3}
  !5 = !{i32 1, !"wchar_size", i32 2}
  !6 = !{i32 7, !"PIC Level", i32 2}
  !7 = distinct !DISubprogram(name: "foo", linkageName: "foo", scope: !1, file: !1, line: 6, type: !8, scopeLine: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !10)
  !8 = !DISubroutineType(types: !9)
  !9 = !{!2, !2}
  !10 = !{!11}
  !11 = !DILocalVariable(name: "baz", scope: !7, file: !1, line: 7, type: !2)
  !12 = !DILocation(line: 10, scope: !7)
...
---
name: test
tracksRegLiveness: true
debugInstrRef: true
liveins:
  - { reg: '$rdi', virtual-reg: '' }
stack:
  - { id: 0, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8,
      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
body:  |
  bb.0:
  liveins: $rdi, $rax, $rbx
    $eax = MOV32ri 0, debug-instr-number 1
    $edi = COPY $eax
    MOV64mr $rsp, 1, $noreg, 16, $noreg, $rdi :: (store 8 into %stack.0)
    $rsi = MOV64rm $rsp, 1, $noreg, 8, $noreg :: (load 8 from %stack.0)

    ; Store a random value onto stack, forces value to be in one place only.
    ; Clobber other registers that contain the value we're to track.
    MOV64mr $rsp, 1, $noreg, 16, $noreg, $rbx :: (store 8 into %stack.0)
    $rax = MOV64ri 0
    $rdi = MOV64ri 0

    DBG_INSTR_REF !11, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !12
    ; CHECK:      DBG_INSTR_REF
    ; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $esi
    RET64 $rsi, debug-location !12
...