llvm/llvm/test/CodeGen/Thumb/machine-cse-physreg.mir

# RUN: llc -mtriple thumbv5e -run-pass=machine-cse -o - %s | FileCheck %s

# This is a contrived example made to expose a bug in
# MachineCSE, see PR32538.

# MachineCSE must not remove this def of $cpsr:
# CHECK-LABEL: bb.1:
# CHECK: , $cpsr = tLSLri

...
---
name:            spam
registers:
  - { id: 0, class: tgpr }
  - { id: 1, class: tgpr }
  - { id: 2, class: tgpr }
  - { id: 3, class: tgpr }
liveins:
  - { reg: '$r0', virtual-reg: '%0' }
body:             |
  bb.0:
    liveins: $r0
    %0 = COPY $r0
    %1, $cpsr = tLSLri %0, 2, 14, $noreg
    tCMPi8 %0, 5, 14, $noreg, implicit-def $cpsr
    tBcc %bb.8, 8, $cpsr

  bb.1:
    %2, $cpsr = tLSLri %0, 2, 14, $noreg

  bb.8:
    liveins: $cpsr
    %3 = COPY $cpsr
    tSTRi killed %3, %0, 0, 14, $noreg
...