1 # RUN: llc -o - %s -mtriple=arm-- -run-pass prologepilog | FileCheck %s 2 --- | 3 define swiftcc i8* @need_emergency_slot(i8 *swiftself %v) { 4 ; Just a dummy to add a swiftself bit. The real code is in the MI below. 5 unreachable 6 } 7 ... 8 --- 9 # CHECK-LABEL: name: need_emergency_slot 10 # Make sure we do not just assume an unsaved/restored callee saved register 11 # is free to use. Callee saved parameters may still be used if they were used 12 # to pass arguments (as in swiftself). 13 name: need_emergency_slot 14 tracksRegLiveness: true 15 stack: 16 - { id: 0, type: default, size: 8, alignment: 8 } 17 - { id: 1, type: default, size: 4096, alignment: 8 } 18 body: | 19 bb.0: 20 liveins: $r10 ; swiftself parameter comes in as $r10 21 22 ; Bring up register pressure to force emergency spilling, coax scavenging 23 ; to use $r10 as that one is not spilled/restored. 24 $r0 = IMPLICIT_DEF 25 $r1 = IMPLICIT_DEF 26 $r2 = IMPLICIT_DEF 27 $r3 = IMPLICIT_DEF 28 $r4 = IMPLICIT_DEF 29 $r5 = IMPLICIT_DEF 30 $r6 = IMPLICIT_DEF 31 $r7 = IMPLICIT_DEF 32 $r8 = IMPLICIT_DEF 33 $r9 = IMPLICIT_DEF 34 $r11 = IMPLICIT_DEF 35 $r12 = IMPLICIT_DEF 36 $lr = IMPLICIT_DEF 37 38 ; Computing the large stack offset requires an extra register. We should 39 ; not just use $r10 for that. 40 ; CHECK-NOT: STRi12 %1,{{.*}}$r10 41 42 STRi12 $r1, %stack.0, 0, 14, $noreg :: (store 4) 43 44 ; use the swiftself parameter value. 45 KILL $r10 46 47 KILL $r0 48 KILL $r1 49 KILL $r2 50 KILL $r3 51 KILL $r4 52 KILL $r5 53 KILL $r6 54 KILL $r7 55 KILL $r8 56 KILL $r9 57 KILL $r11 58 KILL $r12 59 KILL $lr 60 ... 61
