# RUN: llc -run-pass=livedebugvars -run-pass=virtregrewriter -o - %s | FileCheck %s

# Regression test for a bug where LiveDebugVariables used the wrong instruction
# iterator type when debugInstrRef=true, and triggered an assertion.

--- |
  target triple = "x86_64-unknown-linux-gnu"

  define i32 @foo(i32 %a, i32 %b) !dbg !4 {
  entry:
    ret i32 0, !dbg !10
  }

  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!3}

  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
  !1 = !DIFile(filename: "-", directory: "./")
  !2 = !{}
  !3 = !{i32 2, !"Debug Info Version", i32 3}
  !4 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true, scopeLine: 2, isOptimized: true, unit: !0, retainedNodes: !2)
  !5 = !DISubroutineType(types: !6)
  !6 = !{!7, !7, !7}
  !7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
  !8 = !DILocalVariable(name: "local_var", scope: !4, file: !1, line: 7, type: !7)
  !9 = !DILocation(line: 7, column: 1, scope: !4)
  !10 = !DILocation(line: 8, column: 3, scope: !4)

...
---
name:            foo
tracksRegLiveness: true
debugInstrRef: true
body:             |
  bb.0:
    $esi = MOV32ri 2, debug-instr-number 1
    BUNDLE {
      NOOP
    }
    DBG_INSTR_REF !8, !DIExpression(), dbg-instr-ref(1, 0), debug-location !9
    RET 0, undef $eax, debug-location !10
...

# CHECK-LABEL: name:            foo
# CHECK: bb.0:
# CHECK: BUNDLE {
# CHECK: }
# CHECK: DBG_INSTR_REF