llvm-project/llvm/test/MachineVerifier/verifier-phi.mir

# RUN: llc -o - %s -mtriple=x86_64-- -verify-machineinstrs -run-pass=none | FileCheck %s
# REQUIRES: x86-registered-target

# This should cleanly pass the machine verifier
---
# CHECK-LABEL: name: func0
# CHECK: %0:gr32 = PHI undef %1:gr32, %bb.0, undef %1:gr32, %bb.1
name: func0
tracksRegLiveness: true
body: |
  bb.0:
    JCC_1 %bb.1, 4, implicit undef $eflags
    JMP_1 %bb.2

  bb.1:

  bb.2:
    %0 : gr32 = PHI undef %1 : gr32, %bb.0, undef %1 : gr32, %bb.1
...
---
# CHECK-LABEL: name: func1
# CHECK: %2:gr32 = PHI %0, %bb.0, %1, %bb.1
name: func1
tracksRegLiveness: true
body: |
  bb.0:
    %0 : gr32 = IMPLICIT_DEF
    JCC_1 %bb.1, 4, implicit undef $eflags
    JMP_1 %bb.2

  bb.1:
    %1 : gr32 = IMPLICIT_DEF

  bb.2:
    %2 : gr32 = PHI %0, %bb.0, %1, %bb.1
...