llvm/test/CodeGen/MIR/X86/basic-block-liveins.mir

# RUN: llc -march=x86-64 -run-pass none -o - %s | FileCheck %s
# This test ensures that the MIR parser parses basic block liveins correctly.

--- |

  define i32 @test(i32 %a, i32 %b) {
  body:
    %c = add i32 %a, %b
    ret i32 %c
  }

  define i32 @test2(i32 %a, i32 %b) {
  body:
    %c = add i32 %a, %b
    ret i32 %c
  }

  define i32 @test3() {
  body:
    ret i32 0
  }

...
---
name: test
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: bb.0.body:
  ; CHECK-NEXT:    liveins: $edi, $esi
  bb.0.body:
    liveins: $edi, $esi

    $eax = LEA64_32r killed $rdi, 1, killed $rsi, 0, _
    RET64 $eax
...
---
name: test2
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: test2
  ; Verify that we can have multiple lists of liveins that will be merged into
  ; one.
  ; CHECK:       bb.0.body:
  ; CHECK-NEXT:    liveins: $edi, $esi
  bb.0.body:
    liveins: $edi
    liveins: $esi

    $eax = LEA64_32r killed $rdi, 1, killed $rsi, 0, _
    RET64 $eax
...
---
name: test3
tracksRegLiveness: true
body: |
  ; Verify that we can have an empty list of liveins.
  ; CHECK-LABEL: name: test3
  ; CHECK:       bb.0.body:
  ; CHECK-NEXT:    $eax = MOV32r0 implicit-def dead $eflags
  bb.0.body:
    liveins:

    $eax = MOV32r0 implicit-def dead $eflags
    RET64 killed $eax
...