1 ; RUN: llc -mtriple=arm-none-none-eabi -mcpu=cortex-a15 -o - %s | FileCheck --check-prefix=CHECK-A %s
2 ; RUN: llc -mtriple=thumb-none-none-eabi -mcpu=cortex-a15 -o - %s | FileCheck --check-prefix=CHECK-A-THUMB %s
3 ; RUN: llc -mtriple=thumb-apple-none-macho -mcpu=cortex-m3 -o - %s | FileCheck --check-prefix=CHECK-M %s
5 declare arm_aapcscc void @bar()
7 @bigvar = global [16 x i32] zeroinitializer
9 define arm_aapcscc void @irq_fn() alignstack(8) "interrupt"="IRQ" {
10 ; Must save all registers except banked sp and lr (we save lr anyway because
11 ; we actually need it at the end to execute the return ourselves).
13 ; Also need special function return setting pc and CPSR simultaneously.
14 ; CHECK-A-LABEL: irq_fn:
15 ; CHECK-A: push {r0, r1, r2, r3, r10, r11, r12, lr}
16 ; CHECK-A: add r11, sp, #20
17 ; CHECK-A-NOT: sub sp, sp, #{{[0-9]+}}
18 ; CHECK-A: bfc sp, #0, #3
20 ; CHECK-A: sub sp, r11, #20
21 ; CHECK-A: pop {r0, r1, r2, r3, r10, r11, r12, lr}
22 ; CHECK-A: subs pc, lr, #4
24 ; CHECK-A-THUMB-LABEL: irq_fn:
25 ; CHECK-A-THUMB: push.w {r0, r1, r2, r3, r4, r7, r12, lr}
26 ; CHECK-A-THUMB: add r7, sp, #20
27 ; CHECK-A-THUMB: mov r4, sp
28 ; CHECK-A-THUMB: bfc r4, #0, #3
29 ; CHECK-A-THUMB: bl bar
30 ; CHECK-A-THUMB: sub.w r4, r7, #20
31 ; CHECK-A-THUMB: mov sp, r4
32 ; CHECK-A-THUMB: pop.w {r0, r1, r2, r3, r4, r7, r12, lr}
33 ; CHECK-A-THUMB: subs pc, lr, #4
35 ; Normal AAPCS function (r0-r3 pushed onto stack by hardware, lr set to
36 ; appropriate sentinel so no special return needed).
37 ; CHECK-M-LABEL: irq_fn:
38 ; CHECK-M: push {r4, r6, r7, lr}
39 ; CHECK-M: add r7, sp, #8
41 ; CHECK-M: bfc r4, #0, #3
44 ; CHECK-M: sub.w r4, r7, #8
46 ; CHECK-M: pop {r4, r6, r7, pc}
48 call arm_aapcscc void @bar()
52 ; We don't push/pop r12, as it is banked for FIQ
53 define arm_aapcscc void @fiq_fn() alignstack(8) "interrupt"="FIQ" {
54 ; CHECK-A-LABEL: fiq_fn:
55 ; CHECK-A: push {r0, r1, r2, r3, r4, r5, r6, r7, r11, lr}
56 ; 32 to get past r0, r1, ..., r7
57 ; CHECK-A: add r11, sp, #32
58 ; CHECK-A: sub sp, sp, #{{[0-9]+}}
59 ; CHECK-A: bfc sp, #0, #3
62 ; CHECK-A: sub sp, r11, #32
63 ; CHECK-A: pop {r0, r1, r2, r3, r4, r5, r6, r7, r11, lr}
64 ; CHECK-A: subs pc, lr, #4
66 ; CHECK-A-THUMB-LABEL: fiq_fn:
67 ; CHECK-M-LABEL: fiq_fn:
68 %val = load volatile [16 x i32], ptr @bigvar
69 store volatile [16 x i32] %val, ptr @bigvar
73 define arm_aapcscc void @swi_fn() alignstack(8) "interrupt"="SWI" {
74 ; CHECK-A-LABEL: swi_fn:
75 ; CHECK-A: push {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, lr}
76 ; CHECK-A: add r11, sp, #44
77 ; CHECK-A: sub sp, sp, #{{[0-9]+}}
78 ; CHECK-A: bfc sp, #0, #3
80 ; CHECK-A: sub sp, r11, #44
81 ; CHECK-A: pop {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, lr}
82 ; CHECK-A: subs pc, lr, #0
84 %val = load volatile [16 x i32], ptr @bigvar
85 store volatile [16 x i32] %val, ptr @bigvar
89 define arm_aapcscc void @undef_fn() alignstack(8) "interrupt"="UNDEF" {
90 ; CHECK-A-LABEL: undef_fn:
91 ; CHECK-A: push {r0, r1, r2, r3, r10, r11, r12, lr}
92 ; CHECK-A: add r11, sp, #20
93 ; CHECK-A-NOT: sub sp, sp, #{{[0-9]+}}
94 ; CHECK-A: bfc sp, #0, #3
96 ; CHECK-A: sub sp, r11, #20
97 ; CHECK-A: pop {r0, r1, r2, r3, r10, r11, r12, lr}
98 ; CHECK-A: subs pc, lr, #0
104 define arm_aapcscc void @abort_fn() alignstack(8) "interrupt"="ABORT" {
105 ; CHECK-A-LABEL: abort_fn:
106 ; CHECK-A: push {r0, r1, r2, r3, r10, r11, r12, lr}
107 ; CHECK-A: add r11, sp, #20
108 ; CHECK-A-NOT: sub sp, sp, #{{[0-9]+}}
109 ; CHECK-A: bfc sp, #0, #3
111 ; CHECK-A: sub sp, r11, #20
112 ; CHECK-A: pop {r0, r1, r2, r3, r10, r11, r12, lr}
113 ; CHECK-A: subs pc, lr, #4
119 @var = global double 0.0
121 ; We don't save VFP regs, since it would be a massive overhead in the general
123 define arm_aapcscc void @floating_fn() alignstack(8) "interrupt"="IRQ" {
124 ; CHECK-A-LABEL: floating_fn:
128 ; CHECK-A: vadd.f64 {{d[0-9]+}}, {{d[0-9]+}}, {{d[0-9]+}}
129 %lhs = load volatile double, ptr @var
130 %rhs = load volatile double, ptr @var
131 %sum = fadd double %lhs, %rhs
132 store double %sum, ptr @var