70 lines
1.8 KiB
C++
70 lines
1.8 KiB
C++
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#include "mat_mul.h"
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#include <cstdlib>
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#include <cstdio>
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#include <pthread.h>
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static float *A, *B, *C;
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static int M, N, K;
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static int num_threads;
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int min(int a,int b)
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{
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return (a<b)?a:b;
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}
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static void* mat_mul_thread(void *data) {
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// TODO: parallelize & optimize matrix multiplication
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int index = * (int *) data;
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int offset = M / num_threads;
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int start = index * offset;
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int end = (index == num_threads - 1) ? M : (index + 1) * offset;
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int kk, i, k, j;
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float A_calc;
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int bs = 32;
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for (kk = 0; kk < K; kk += bs) {
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for (i = start; i < end; ++i) {
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for (k = kk; k < min(kk + bs, K); k++) {
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A_calc = A[i * K + k];
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if(!(N%8)){
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for (j = 0; j < N; j=j+4) {
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C[i * N + j] += A_calc * B[k * N + j];
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C[i * N + j+1] += A_calc * B[k * N + j+1];
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C[i * N + j+2] += A_calc * B[k * N + j+2];
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C[i * N + j+3] += A_calc * B[k * N + j+3];
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//C[i * N + j+4] += A_calc * B[k * N + j+4];
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//C[i * N + j+5] += A_calc * B[k * N + j+5];
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//C[i * N + j+6] += A_calc * B[k * N + j+6];
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//C[i * N + j+7] += A_calc * B[k * N + j+7];
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}
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}
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else{
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for(j=0;j<N;j++){
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C[i * N + j] += A_calc * B[k * N + j];
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}
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}
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}
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}
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}
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return NULL;
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}
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void mat_mul(float *_A, float *_B, float *_C, int _M, int _N, int _K, int _num_threads) {
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A = _A, B = _B, C = _C;
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M = _M, N = _N, K = _K;
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num_threads = _num_threads;
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// TODO: create '_num_threads' pthreads
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pthread_t thread[num_threads];
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for(int i=0;i<num_threads;i++){
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int* index = (int*)malloc(sizeof(int));
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*index=i;
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pthread_create(&thread[i], NULL, mat_mul_thread, index);
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}
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for(int i=0;i<num_threads;i++)
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pthread_join(thread[i], NULL);
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}
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