| 1 | #include <stdlib.h> |
| 2 | #include <stdio.h> |
| 3 | #include <string.h> |
| 4 | #include <errno.h> |
| 5 | #include <pthread.h> |
| 6 | |
| 7 | static void *spin_snb(void *uu) |
| 8 | { |
| 9 | char __attribute__((aligned(32))) m[2][32]; |
| 10 | |
| 11 | asm("vpxor %%xmm1, %%xmm1, %%xmm1;\n" |
| 12 | "vpxor %%xmm2, %%xmm2, %%xmm2;\n" |
| 13 | "0:\n" |
| 14 | "vmovaps (%0), %%ymm0;\n" |
| 15 | "vmovaps %%ymm1, (%1);\n" |
| 16 | "vaddps %%ymm1, %%ymm1, %%ymm2\n" |
| 17 | "vmulps %%ymm3, %%ymm3, %%ymm4\n" |
| 18 | "vmovaps (%0), %%ymm0;\n" |
| 19 | "vmovaps %%xmm1, (%1);\n" |
| 20 | "vaddps %%ymm1, %%ymm1, %%ymm2\n" |
| 21 | "vmulps %%ymm3, %%ymm3, %%ymm4\n" |
| 22 | "vmovaps (%0), %%ymm0;\n" |
| 23 | "vaddps %%ymm1, %%ymm1, %%ymm2\n" |
| 24 | "vmulps %%ymm3, %%ymm3, %%ymm4\n" |
| 25 | "jmp 0b;\n" |
| 26 | : |
| 27 | : "r" (&m[0]), "r" (&m[1]) |
| 28 | : "rax", "rcx"); |
| 29 | abort(); |
| 30 | } |
| 31 | |
| 32 | static void *spin(void *uu) |
| 33 | { |
| 34 | while(1) { |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | int main(int argc, char **argv) |
| 39 | { |
| 40 | int i, n; |
| 41 | |
| 42 | n = 4; |
| 43 | pthread_t threads[n]; |
| 44 | for(i = 0; i < n; i++) { |
| 45 | if(pthread_create(&threads[i], NULL, spin, NULL)) { |
| 46 | fprintf(stderr, "loadcpu: pthread_create: %s\n", strerror(errno)); |
| 47 | exit(1); |
| 48 | } |
| 49 | } |
| 50 | pthread_join(threads[0], NULL); |
| 51 | return(0); |
| 52 | } |
| 53 | |
| 54 | /* |
| 55 | * Local Variables: |
| 56 | * compile-command: "gcc -g -Wall -o loadcpu loadcpu.c -lpthread" |
| 57 | * End: |
| 58 | */ |