1; RUN: llc -mtriple=aarch64-linux-gnu -disable-post-ra -verify-machineinstrs -o - %s | FileCheck %s 2; RUN: llc -mtriple=arm64-apple-ios -disable-post-ra -verify-machineinstrs -o - %s | FileCheck %s --check-prefix=CHECK-MACHO 3; RUN: llc -mtriple=aarch64-none-linux-gnu -disable-post-ra -mattr=-fp-armv8 -verify-machineinstrs < %s | FileCheck --check-prefix=CHECK-NOFP-ARM64 %s 4 5declare void @use_addr(i8*) 6 7define void @test_simple_alloca(i64 %n) { 8; CHECK-LABEL: test_simple_alloca: 9 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 16 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]] 21 22 call void @use_addr(i8* %buf) 23; CHECK: bl use_addr 24 25 ret void 26 ; Make sure epilogue restores sp from fp 27; CHECK: {{sub|mov}} sp, x29 28; CHECK: ret 29} 30 31declare void @use_addr_loc(i8*, i64*) 32 33define 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 37 38 %loc = alloca i64 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 44 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]] 49 50; CHECK: sub {{x[0-9]+}}, x29, #[[LOC_FROM_FP:[0-9]+]] 51 52 call void @use_addr_loc(i8* %buf, i64* %loc) 53; CHECK: bl use_addr 54 55 %val = load i64, i64* %loc 56 57; CHECK: ldur x0, [x29, #-[[LOC_FROM_FP]]] 58 59 ret i64 %val 60 ; Make sure epilogue restores sp from fp 61; CHECK: {{sub|mov}} sp, x29 62; CHECK: ret 63} 64 65define void @test_variadic_alloca(i64 %n, ...) { 66; CHECK-LABEL: test_variadic_alloca: 67 68; [...] 69 70 71; CHECK-NOFP-AARCH64: sub sp, sp, #80 72; CHECK-NOFP-AARCH64: stp x29, x30, [sp, #64] 73; CHECK-NOFP-AARCH64: add x29, sp, #64 74; CHECK-NOFP-AARCH64: sub [[TMP:x[0-9]+]], x29, #64 75; CHECK-NOFP-AARCH64: add x8, [[TMP]], #0 76 77 78; CHECK: stp x29, x30, [sp, #-16]! 79; CHECK: mov x29, sp 80; CHECK: sub sp, sp, #192 81; CHECK-DAG: stp q6, q7, [x29, #-96] 82; [...] 83; CHECK-DAG: stp q0, q1, [x29, #-192] 84 85; CHECK-DAG: stp x5, x6, [x29, #-24] 86; [...] 87; CHECK-DAG: stp x1, x2, [x29, #-56] 88 89; CHECK-NOFP-ARM64: stp x29, x30, [sp, #-16]! 90; CHECK-NOFP-ARM64: mov x29, sp 91; CHECK-NOFP-ARM64: sub sp, sp, #64 92; CHECK-NOFP-ARM64-DAG: stp x5, x6, [x29, #-24] 93; [...] 94; CHECK-NOFP-ARM64-DAG: stp x3, x4, [x29, #-40] 95; [...] 96; CHECK-NOFP-ARM64-DAG: stp x1, x2, [x29, #-56] 97; [...] 98; CHECK-NOFP-ARM64: mov x8, sp 99 100 %addr = alloca i8, i64 %n 101 102 call void @use_addr(i8* %addr) 103; CHECK: bl use_addr 104 105 ret void 106 107; CHECK-NOFP-AARCH64: sub sp, x29, #64 108; CHECK-NOFP-AARCH64: ldp x29, x30, [sp, #64] 109; CHECK-NOFP-AARCH64: add sp, sp, #80 110 111; CHECK-NOFP-ARM64: mov sp, x29 112; CHECK-NOFP-ARM64: ldp x29, x30, [sp], #16 113} 114 115define void @test_alloca_large_frame(i64 %n) { 116; CHECK-LABEL: test_alloca_large_frame: 117; CHECK-MACHO-LABEL: test_alloca_large_frame: 118 119 120; CHECK: stp x29, x30, [sp, #-32]! 121; CHECK: stp x28, x19, [sp, #16] 122; CHECK: mov x29, sp 123; CHECK: sub sp, sp, #1953, lsl #12 124; CHECK: sub sp, sp, #512 125 126; CHECK-MACHO: stp x20, x19, [sp, #-32]! 127; CHECK-MACHO: stp x29, x30, [sp, #16] 128; CHECK-MACHO: add x29, sp, #16 129; CHECK-MACHO: sub sp, sp, #1953, lsl #12 130; CHECK-MACHO: sub sp, sp, #512 131 132 %addr1 = alloca i8, i64 %n 133 %addr2 = alloca i64, i64 1000000 134 135 call void @use_addr_loc(i8* %addr1, i64* %addr2) 136 137 ret void 138 139; CHECK: mov sp, x29 140; CHECK: ldp x28, x19, [sp, #16] 141; CHECK: ldp x29, x30, [sp], #32 142 143; CHECK-MACHO: sub sp, x29, #16 144; CHECK-MACHO: ldp x29, x30, [sp, #16] 145; CHECK-MACHO: ldp x20, x19, [sp], #32 146} 147 148declare i8* @llvm.stacksave() 149declare void @llvm.stackrestore(i8*) 150 151define void @test_scoped_alloca(i64 %n) { 152; CHECK-LABEL: test_scoped_alloca: 153 154 %sp = call i8* @llvm.stacksave() 155; CHECK: mov x29, sp 156; CHECK: mov [[SAVED_SP:x[0-9]+]], sp 157; CHECK: mov [[OLDSP:x[0-9]+]], sp 158 159 %addr = alloca i8, i64 %n 160; CHECK: and [[SPDELTA:x[0-9]+]], {{x[0-9]+}}, #0xfffffffffffffff0 161; CHECK-DAG: sub [[NEWSP:x[0-9]+]], [[OLDSP]], [[SPDELTA]] 162; CHECK: mov sp, [[NEWSP]] 163 164 call void @use_addr(i8* %addr) 165; CHECK: bl use_addr 166 167 call void @llvm.stackrestore(i8* %sp) 168; CHECK: mov sp, [[SAVED_SP]] 169 170 ret void 171} 172