anndata: Replaced with new Python version.

[utils.git] / loadcpu.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <pthread.h>

static void *spin_snb(void *uu)
{
    char __attribute__((aligned(32))) m[2][32];
    
    asm("vpxor %%xmm1, %%xmm1, %%xmm1;\n"
	"vpxor %%xmm2, %%xmm2, %%xmm2;\n"
	"0:\n"
	"vmovaps (%0), %%ymm0;\n"
	"vmovaps %%ymm1, (%1);\n"
	"vaddps %%ymm1, %%ymm1, %%ymm2\n"
	"vmulps %%ymm3, %%ymm3, %%ymm4\n"
	"vmovaps (%0), %%ymm0;\n"
	"vmovaps %%xmm1, (%1);\n"
	"vaddps %%ymm1, %%ymm1, %%ymm2\n"
	"vmulps %%ymm3, %%ymm3, %%ymm4\n"
	"vmovaps (%0), %%ymm0;\n"
	"vaddps %%ymm1, %%ymm1, %%ymm2\n"
	"vmulps %%ymm3, %%ymm3, %%ymm4\n"
	"jmp 0b;\n"
	:
	: "r" (&m[0]), "r" (&m[1])
	: "rax", "rcx");
    abort();
}

static void *spin(void *uu)
{
    while(1) {
    }
}

int main(int argc, char **argv)
{
    int i, n;
    
    n = 4;
    pthread_t threads[n];
    for(i = 0; i < n; i++) {
	if(pthread_create(&threads[i], NULL, spin, NULL)) {
	    fprintf(stderr, "loadcpu: pthread_create: %s\n", strerror(errno));
	    exit(1);
	}
    }
    pthread_join(threads[0], NULL);
    return(0);
}

/* 
 * Local Variables:
 * compile-command: "gcc -g -Wall -o loadcpu loadcpu.c -lpthread"
 * End:
 */