1 //===-- main.cpp ------------------------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 #include <stdio.h> 9 #include <stdint.h> 10 alignas(16) uint8_t buf[32]; 11 // This uses inline assembly to generate an instruction that writes to a large 12 // block of memory. If it fails on your compiler/architecture, please add 13 // appropriate code to generate a large write to "buf". If you cannot write at 14 // least 2*sizeof(void*) bytes with a single instruction, you will have to skip 15 // this test. 16 17 int main() { 18 #if defined(__i386__) || defined(__x86_64__) 19 asm volatile ("movdqa %%xmm0, %0" : : "m"(buf)); 20 #elif defined(__arm__) 21 asm volatile ("stm %0, { r0, r1, r2, r3 }" : : "r"(buf)); 22 #elif defined(__aarch64__) 23 asm volatile ("stp x0, x1, %0" : : "m"(buf)); 24 #elif defined(__mips__) 25 asm volatile ("lw $2, %0" : : "m"(buf)); 26 #endif 27 return 0; 28 } 29