# RUN: llc -verify-machineinstrs -mtriple=arm64-applie-ios7.0 -start-before=aarch64-lower-homogeneous-prolog-epilog -homogeneous-prolog-epilog %s -o /dev/null
#
# This test ensures defined registers are preserved after lowering homogeneous
# epilog into helper calls. Without the fix, the verifier would complain about
# X20 being used by use_x20 without being defined.
--- |
  define void @foo() {
  entry:
    ret void
  }
  declare void @use_x20()
...
---
name:            foo
alignment:       4
tracksRegLiveness: true
liveins:
  - { reg: '$x0' }
  - { reg: '$x20' }
body:             |
  bb.0:
    liveins: $x0, $x20, $lr, $x19, $x20
    frame-setup HOM_Prolog $lr, $fp, $x19, $x20, 16
    $sp = frame-setup SUBXri $sp, 32, 0
  bb.1:
    $sp = frame-destroy ADDXri $sp, 32, 0
    $lr, $fp, $x19, $x20 = frame-destroy HOM_Epilog
    TCRETURNdi @use_x20, 0, csr_aarch64_aapcs, implicit $sp, implicit $x20