#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <sys/time.h>

static volatile sig_atomic_t counter = 0;

static void fn(void)
{
	unsigned char q = 0;
	while (1) {
		unsigned char xv[64];
		unsigned c, i;
		__asm__ volatile("vpbroadcastb %2, %%zmm31; 1: loop 1b; vmovdqu64 %%zmm31, %0" : "=m"(xv), "=c"(c) : "r"((unsigned)q), "c"(1000)
#ifdef __AVX512F__
			: "zmm31"
#endif
			);
		for (i = 0; i < 64; i++) {
			if (xv[i] != q) {
				fprintf(stderr, "mismatch[%x]: %x != %x\n", i, xv[i], q);
				return;
			}
		}
		q++;
		if (counter >= 100) {
			alarm(0);
			write(1, "x", 1);
			execl("/proc/self/exe", "/proc/self/exe", NULL);
		}
	}
}

static void alrm(int sig)
{
	__asm__ volatile ("vpbroadcastb %0, %%zmm31" :: "r"(0x40)
#ifdef __AVX512F__
			: "zmm31"
#endif
		);
	write(1, ".", 1);
	counter++;
}

int main(void)
{
	struct itimerval it;
	signal(SIGALRM, alrm);
	it.it_interval.tv_sec = 0;
	it.it_interval.tv_usec = 10000;
	it.it_value.tv_sec = 0;
	it.it_value.tv_usec = 10000;
	setitimer(ITIMER_REAL, &it, NULL);
	fn();
	return 1;
}