# RUN: llc -mtriple=aarch64-unknown-fuchsia -run-pass=prologepilog %s -o - | FileCheck %s

# This test ensures that constant registers like XZR are not considered live
# even if they are in the liveins list. This prevents the stack probe from
# incorrectly thinking it needs to preserve XZR if it's used as a temporary
# register.

--- |
  define void @func() #0 {
    ret void
  }
  attributes #0 = { "probe-stack"="inline-asm" "stack-probe-size"="4096" }
...
---
name:            func
tracksRegLiveness: true
frameInfo:
  stackSize:       4096
  maxAlignment:    8
  localFrameSize:  4096
stack:
  - { id: 0, size: 4096, alignment: 8 }
  - { id: 1, type: variable-sized }
body:             |
  bb.0:
    liveins: $xzr
    ; CHECK-LABEL: name: func
    ; CHECK: $xzr = frame-setup LDRXui $sp, 0
    $x0 = COPY $xzr
    RET_ReallyLR