llvm/test/CodeGen/MIR/X86/undefined-stack-object.mir

# RUN: not llc -march=x86-64 -start-after machine-sink -stop-after machine-sink -o /dev/null %s 2>&1 | FileCheck %s
--- |

  define i32 @test(i32 %a) {
  entry:
    %b = alloca i32
    store i32 %a, i32* %b
    %c = load i32, i32* %b
    ret i32 %c
  }

...
---
name:            test
isSSA:           true
tracksRegLiveness: true
registers:
  - { id: 0, class: gr32 }
frameInfo:
  maxAlignment:  4
stack:
  - { id: 0, name: b, size: 4, alignment: 4 }
body:
  - id:          0
    name:        entry
    instructions:
      - '%0 = COPY %edi'
      # CHECK: [[@LINE+1]]:18: use of undefined stack object '%stack.2'
      - 'MOV32mr %stack.2, 1, _, 0, _, %0'
      - '%eax = COPY %0'
      - 'RETQ %eax'
...