# RUN: llc -march=x86-64 -start-after machine-sink -stop-after machine-sink -o /dev/null %s | FileCheck %s
# This test ensures that the MIR parser parses subregisters in register operands
# correctly.

--- |

  define zeroext i1 @t(i1 %c) {
  entry:
    ret i1 %c
  }

...
---
name:            t
isSSA:           true
tracksRegLiveness: true
registers:
  - { id: 0, class: gr32 }
  - { id: 1, class: gr8 }
  - { id: 2, class: gr8 }
body:
  - name:        entry
    id:          0
    instructions:
      # CHECK:      %0 = COPY %edi
      # CHECK-NEXT: %1 = COPY %0:sub_8bit
      - '%0 = COPY %edi'
      - '%1 = COPY %0:sub_8bit'
      - '%2 = AND8ri %1, 1, implicit-def %eflags'
      - '%al = COPY %2'
      - 'RETQ %al'
...