llvm/test/DebugInfo/MIR/InstrRef/undef-phi-through-regalloc.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 6
# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \
# RUN:    -experimental-debug-variable-locations \
# RUN:    -run-pass=phi-node-elimination,livedebugvars,greedy,virtregrewriter \
# RUN:    | FileCheck %s
#
# This test checks phi-node-elimination does not create a debug phi
# with invalid register reference

--- |
  define void @f() !dbg !2 {
    ret void
  }

  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!1}
  !0 = distinct !DICompileUnit(language: DW_LANG_C, file: !DIFile(filename: "x", directory: ""), emissionKind: FullDebug)
  !1 = !{i32 2, !"Debug Info Version", i32 3}
  !2 = distinct !DISubprogram(scope: !0, type: !DISubroutineType(types: !{null}), unit: !0, retainedNodes: !{!6})
  !6 = !DILocalVariable(scope: !2)
...
---
name: f
debugInstrRef: true
body: |
  ; CHECK-LABEL: name: f
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   dead renamable $al = IMPLICIT_DEF
  ; CHECK-NEXT:   DBG_INSTR_REF !7, !DIExpression(), dbg-instr-ref(1, 0), debug-location !DILocation(line: 0, scope: !3)
  ; CHECK-NEXT:   RET 0
  bb.0:
    successors: %bb.1
  bb.1:
    %0:gr8 = PHI undef %0:gr8, %bb.0, debug-instr-number 1
    DBG_INSTR_REF !6, !DIExpression(), dbg-instr-ref(1, 0), debug-location !DILocation(line: 0, scope: !2)
    RET 0
...