# RUN: llc -o - %s -mtriple=arm-- -run-pass prologepilog | FileCheck %s
--- |
  define swiftcc i8* @need_emergency_slot(i8 *swiftself %v) {
    ; Just a dummy to add a swiftself bit. The real code is in the MI below.
    unreachable
  }
...
---
# CHECK-LABEL: name: need_emergency_slot
# Make sure we do not just assume an unsaved/restored callee saved register
# is free to use. Callee saved parameters may still be used if they were used
# to pass arguments (as in swiftself).
name: need_emergency_slot
tracksRegLiveness: true
stack:
  - { id: 0, type: default, size: 8, alignment: 8 }
  - { id: 1, type: default, size: 4096, alignment: 8 }
body: |
  bb.0:
    liveins: $r10   ; swiftself parameter comes in as $r10

    ; Bring up register pressure to force emergency spilling, coax scavenging
    ; to use $r10 as that one is not spilled/restored.
    $r0 = IMPLICIT_DEF
    $r1 = IMPLICIT_DEF
    $r2 = IMPLICIT_DEF
    $r3 = IMPLICIT_DEF
    $r4 = IMPLICIT_DEF
    $r5 = IMPLICIT_DEF
    $r6 = IMPLICIT_DEF
    $r7 = IMPLICIT_DEF
    $r8 = IMPLICIT_DEF
    $r9 = IMPLICIT_DEF
    $r11 = IMPLICIT_DEF
    $r12 = IMPLICIT_DEF
    $lr = IMPLICIT_DEF

    ; Computing the large stack offset requires an extra register. We should
    ; not just use $r10 for that.
    ; CHECK-NOT: STRi12 %1,{{.*}}$r10

    STRi12 $r1, %stack.0, 0, 14, $noreg :: (store 4)

    ; use the swiftself parameter value.
    KILL $r10

    KILL $r0
    KILL $r1
    KILL $r2
    KILL $r3
    KILL $r4
    KILL $r5
    KILL $r6
    KILL $r7
    KILL $r8
    KILL $r9
    KILL $r11
    KILL $r12
    KILL $lr
...