1*99451b44SJordan Rupprecht #include <stdio.h>
2*99451b44SJordan Rupprecht #include <stdint.h>
3*99451b44SJordan Rupprecht alignas(16) uint8_t buf[32];
4*99451b44SJordan Rupprecht // This uses inline assembly to generate an instruction that writes to a large
5*99451b44SJordan Rupprecht // block of memory. If it fails on your compiler/architecture, please add
6*99451b44SJordan Rupprecht // appropriate code to generate a large write to "buf". If you cannot write at
7*99451b44SJordan Rupprecht // least 2*sizeof(void*) bytes with a single instruction, you will have to skip
8*99451b44SJordan Rupprecht // this test.
9*99451b44SJordan Rupprecht
main()10*99451b44SJordan Rupprecht int main() {
11*99451b44SJordan Rupprecht #if defined(__i386__) || defined(__x86_64__)
12*99451b44SJordan Rupprecht asm volatile ("movdqa %%xmm0, %0" : : "m"(buf));
13*99451b44SJordan Rupprecht #elif defined(__arm__)
14*99451b44SJordan Rupprecht asm volatile ("stm %0, { r0, r1, r2, r3 }" : : "r"(buf));
15*99451b44SJordan Rupprecht #elif defined(__aarch64__)
16*99451b44SJordan Rupprecht asm volatile ("stp x0, x1, %0" : : "m"(buf));
17*99451b44SJordan Rupprecht #elif defined(__mips__)
18*99451b44SJordan Rupprecht asm volatile ("lw $2, %0" : : "m"(buf));
19*99451b44SJordan Rupprecht #endif
20*99451b44SJordan Rupprecht return 0;
21*99451b44SJordan Rupprecht }
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