1 ; RUN: llc -mtriple=aarch64-none-linux-gnu -verify-machineinstrs < %s | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-AARCH64
2 ; RUN: llc -mtriple=arm64 -verify-machineinstrs -o - %s | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-ARM64
3 ; RUN: llc -mtriple=aarch64-none-linux-gnu -mattr=-fp-armv8 -verify-machineinstrs < %s | FileCheck --check-prefix=CHECK-NOFP %s
5 declare void @use_addr(i8*)
7 define void @test_simple_alloca(i64 %n) {
8 ; CHECK-LABEL: test_simple_alloca:
10 %buf = alloca i8, i64 %n
11 ; Make sure we align the stack change to 16 bytes:
12 ; CHECK: {{mov|add}} x29
13 ; CHECK: mov [[TMP:x[0-9]+]], sp
14 ; CHECK: add [[SPDELTA_TMP:x[0-9]+]], x0, #15
15 ; CHECK: and [[SPDELTA:x[0-9]+]], [[SPDELTA_TMP]], #0xfffffffffffffff0
17 ; Make sure we change SP. It would be surprising if anything but x0 were used
18 ; for the final sp, but it could be if it was then moved into x0.
19 ; CHECK: sub [[NEWSP:x[0-9]+]], [[TMP]], [[SPDELTA]]
20 ; CHECK: mov sp, [[NEWSP]]
22 call void @use_addr(i8* %buf)
26 ; Make sure epilogue restores sp from fp
27 ; CHECK: {{sub|mov}} sp, x29
31 declare void @use_addr_loc(i8*, i64*)
33 define i64 @test_alloca_with_local(i64 %n) {
34 ; CHECK-LABEL: test_alloca_with_local:
35 ; CHECK-DAG: sub sp, sp, [[LOCAL_STACK:#[0-9]+]]
36 ; CHECK-DAG: {{mov|add}} x29, sp
39 %buf = alloca i8, i64 %n
40 ; Make sure we align the stack change to 16 bytes:
41 ; CHECK: mov [[TMP:x[0-9]+]], sp
42 ; CHECK: add [[SPDELTA_TMP:x[0-9]+]], x0, #15
43 ; CHECK: and [[SPDELTA:x[0-9]+]], [[SPDELTA_TMP]], #0xfffffffffffffff0
45 ; Make sure we change SP. It would be surprising if anything but x0 were used
46 ; for the final sp, but it could be if it was then moved into x0.
47 ; CHECK: sub [[NEWSP:x[0-9]+]], [[TMP]], [[SPDELTA]]
48 ; CHECK: mov sp, [[NEWSP]]
50 ; CHECK: sub {{x[0-9]+}}, x29, #[[LOC_FROM_FP:[0-9]+]]
52 call void @use_addr_loc(i8* %buf, i64* %loc)
56 ; CHECK-AARCH64: sub x[[TMP:[0-9]+]], x29, #[[LOC_FROM_FP]]
57 ; CHECK-AARCH64: ldr x0, [x[[TMP]]]
59 ; CHECK-ARM64: ldur x0, [x29, #-[[LOC_FROM_FP]]]
62 ; Make sure epilogue restores sp from fp
63 ; CHECK: {{sub|mov}} sp, x29
67 define void @test_variadic_alloca(i64 %n, ...) {
68 ; CHECK-LABEL: test_variadic_alloca:
70 ; CHECK-AARCH64: sub sp, sp, #{{[0-9]+}}
71 ; CHECK-AARCH64: add x29, sp, #192
72 ; CHECK-AARCH64: sub [[TMP:x[0-9]+]], x29, #192
73 ; CHECK-AARCH64: add x8, [[TMP]], #0
74 ; CHECK-AARCH64-FP: str q7, [x8, #112]
76 ; CHECK-AARCH64-FP: str q1, [x8, #16]
79 ; CHECK-NOFP: sub sp, sp, #80
80 ; CHECK-NOFP: stp x29, x30, [sp, #64]
81 ; CHECK-NOFP: add x29, sp, #64
82 ; CHECK-NOFP: sub [[TMP:x[0-9]+]], x29, #64
83 ; CHECK-NOFP: add x8, [[TMP]], #0
86 ; CHECK-ARM64: stp x29, x30, [sp, #-16]!
87 ; CHECK-ARM64: mov x29, sp
88 ; CHECK-ARM64: sub sp, sp, #192
89 ; CHECK-ARM64: stp q6, q7, [x29, #-96]
91 ; CHECK-ARM64: stp q0, q1, [x29, #-192]
93 ; CHECK-ARM64: stp x6, x7, [x29, #-16]
95 ; CHECK-ARM64: stp x2, x3, [x29, #-48]
98 %addr = alloca i8, i64 %n
100 call void @use_addr(i8* %addr)
104 ; CHECK-AARCH64: sub sp, x29, #192
105 ; CHECK-AARCH64: ldp x29, x30, [sp, #192]
106 ; CHECK-AARCH64: add sp, sp, #208
108 ; CHECK-NOFP: sub sp, x29, #64
109 ; CHECK-NOFP: ldp x29, x30, [sp, #64]
110 ; CHECK-NOFP: add sp, sp, #80
113 define void @test_alloca_large_frame(i64 %n) {
114 ; CHECK-LABEL: test_alloca_large_frame:
116 ; CHECK-AARCH64: sub sp, sp, #496
117 ; CHECK-AARCH64: stp x29, x30, [sp, #480]
118 ; CHECK-AARCH64: add x29, sp, #480
119 ; CHECK-AARCH64: sub sp, sp, #48
120 ; CHECK-AARCH64: sub sp, sp, #1953, lsl #12
122 ; CHECK-ARM64: stp x20, x19, [sp, #-32]!
123 ; CHECK-ARM64: stp x29, x30, [sp, #16]
124 ; CHECK-ARM64: add x29, sp, #16
125 ; CHECK-ARM64: sub sp, sp, #7999488
126 ; CHECK-ARM64: sub sp, sp, #512
128 %addr1 = alloca i8, i64 %n
129 %addr2 = alloca i64, i64 1000000
131 call void @use_addr_loc(i8* %addr1, i64* %addr2)
134 ; CHECK-AARCH64: sub sp, x29, #480
135 ; CHECK-AARCH64: ldp x29, x30, [sp, #480]
136 ; CHECK-AARCH64: add sp, sp, #496
138 ; CHECK-ARM64: sub sp, x29, #16
139 ; CHECK-ARM64: ldp x29, x30, [sp, #16]
140 ; CHECK-ARM64: ldp x20, x19, [sp], #32
143 declare i8* @llvm.stacksave()
144 declare void @llvm.stackrestore(i8*)
146 define void @test_scoped_alloca(i64 %n) {
147 ; CHECK-LABEL: test_scoped_alloca:
149 %sp = call i8* @llvm.stacksave()
150 ; CHECK: mov [[SAVED_SP:x[0-9]+]], sp
151 ; CHECK: mov [[OLDSP:x[0-9]+]], sp
153 %addr = alloca i8, i64 %n
154 ; CHECK: and [[SPDELTA:x[0-9]+]], {{x[0-9]+}}, #0xfffffffffffffff0
155 ; CHECK-DAG: sub [[NEWSP:x[0-9]+]], [[OLDSP]], [[SPDELTA]]
156 ; CHECK: mov sp, [[NEWSP]]
158 call void @use_addr(i8* %addr)
161 call void @llvm.stackrestore(i8* %sp)
162 ; CHECK: mov sp, [[SAVED_SP]]