llvm/test/CodeGen/MIR/X86/virtual-registers.mir

# RUN: llc -march=x86-64 -run-pass none -o - %s | FileCheck %s
# This test ensures that the MIR parser parses virtual register definitions and
# references correctly.

--- |

  define i32 @bar(i32 %a) {
  entry:
    %0 = icmp sle i32 %a, 10
    br i1 %0, label %less, label %exit

  less:
    ret i32 0

  exit:
    ret i32 %a
  }

  define i32 @foo(i32 %a) {
  entry:
    %0 = icmp sle i32 %a, 10
    br i1 %0, label %less, label %exit

  less:
    ret i32 0

  exit:
    ret i32 %a
  }

...
---
name:            bar
tracksRegLiveness: true
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: gr32, preferred-register: '' }
# CHECK-NEXT:   - { id: 1, class: gr32, preferred-register: '' }
# CHECK-NEXT:   - { id: 2, class: gr32, preferred-register: '' }
registers:
  - { id: 0, class: gr32 }
  - { id: 1, class: gr32 }
  - { id: 2, class: gr32 }
body: |
  bb.0.entry:
    successors: %bb.2.exit, %bb.1.less
    liveins: $edi
    ; CHECK:      %0:gr32 = COPY $edi
    ; CHECK-NEXT: %1:gr32 = SUB32ri8 %0, 10
    %0 = COPY $edi
    %1 = SUB32ri8 %0, 10, implicit-def $eflags
    JCC_1 %bb.2.exit, 15, implicit $eflags
    JMP_1 %bb.1.less

  bb.1.less:
    ; CHECK:      %2:gr32 = MOV32r0
    ; CHECK-NEXT: $eax = COPY %2
    %2 = MOV32r0 implicit-def $eflags
    $eax = COPY %2
    RET64 $eax

  bb.2.exit:
    $eax = COPY %0
    RET64 $eax
...
---
name:            foo
tracksRegLiveness: true
# CHECK: name: foo
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: gr32, preferred-register: '' }
# CHECK-NEXT:   - { id: 1, class: gr32, preferred-register: '' }
# CHECK-NEXT:   - { id: 2, class: gr32, preferred-register: '' }
registers:
  - { id: 2, class: gr32 }
  - { id: 0, class: gr32 }
  - { id: 10, class: gr32 }
body: |
  bb.0.entry:
    successors: %bb.2.exit, %bb.1.less
    liveins: $edi
    ; CHECK:      %0:gr32 = COPY $edi
    ; CHECK-NEXT: %1:gr32 = SUB32ri8 %0, 10
    %2 = COPY $edi
    %0 = SUB32ri8 %2, 10, implicit-def $eflags
    JCC_1 %bb.2.exit, 15, implicit $eflags
    JMP_1 %bb.1.less

  bb.1.less:
    ; CHECK:      %2:gr32 = MOV32r0
    ; CHECK-NEXT: $eax = COPY %2
    %10 = MOV32r0 implicit-def $eflags
    $eax = COPY %10
    RET64 $eax

  bb.2.exit:
    ; CHECK: $eax = COPY %0
    $eax = COPY %2
    RET64 $eax
...