third_party/llvm-7.0/llvm/test/CodeGen/MIR/X86/early-clobber-register-flag.mir

# RUN: llc -march=x86-64 -run-pass none -o - %s | FileCheck %s
# This test ensures that the MIR parser parses the 'early-clobber' register
# flags correctly.

--- |

  declare void @foo(i32)

  define void @test(i32 %a, i32 %b) #0 {
  entry:
    %c = add i32 %a, %b
    call void asm sideeffect "nop", "~{ax},~{di}"()
    call void @foo(i32 %c)
    ret void
  }

  attributes #0 = { optsize }

...
---
name:            test
tracksRegLiveness: true
liveins:
  - { reg: '$edi' }
  - { reg: '$esi' }
frameInfo:
  stackSize:     8
  adjustsStack:  true
  hasCalls:      true
body: |
  bb.0.entry:
    liveins: $edi, $esi

    frame-setup PUSH64r undef $rax, implicit-def $rsp, implicit $rsp
    CFI_INSTRUCTION def_cfa_offset 16
    $ecx = COPY $edi
    $ecx = ADD32rr killed $ecx, killed $esi, implicit-def dead $eflags
  ; CHECK: INLINEASM &nop, 1, 12, implicit-def dead early-clobber $ax, 12, implicit-def dead early-clobber $di
    INLINEASM &nop, 1, 12, implicit-def dead early-clobber $ax, 12, implicit-def dead early-clobber $di
    $edi = COPY killed $ecx
    CALL64pcrel32 @foo, csr_64, implicit $rsp, implicit $edi, implicit-def $rsp
    $rax = POP64r implicit-def $rsp, implicit $rsp
    RETQ
...