# 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, _ :: (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
...