77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
#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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#define BLOCKSIZE 32
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#define min(a,b) (((a) < (b)) ? (a) : (b))
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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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static void* mat_mul_thread(void *data) {
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// TODO: parallelize & optimize matrix multiplication
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int num_slice = *((int *)data);
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int slice = M/num_threads;
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int start = num_slice * slice;
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int end;
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if (num_slice < num_threads - 1) end = (num_slice + 1) * slice;
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else end = M;
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float Aik;
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int bs = BLOCKSIZE;
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for (int ii = start; ii < end; ii += bs){
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for (int kk = 0; kk < K; kk += bs) {
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//for (int jj = 0; jj < N; jj += bs) {
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for (int i = ii; i < min(ii + bs, end); i++) {
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for (int k = kk; k < min(kk + bs, K); k++) {
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Aik = A[i * K + k];
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//int size = min(jj + bs, N);
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int ssize = (N / 8) * 8;
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for (int j = 0; j < ssize; j += 8) {
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C[i * N + j] += Aik * B[k * N + j];
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C[i * N + j+1] += Aik * B[k * N + j+1];
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C[i * N + j+2] += Aik * B[k * N + j+2];
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C[i * N + j+3] += Aik * B[k * N + j+3];
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C[i * N + j+4] += Aik * B[k * N + j+4];
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C[i * N + j+5] += Aik * B[k * N + j+5];
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C[i * N + j+6] += Aik * B[k * N + j+6];
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C[i * N + j+7] += Aik * B[k * N + j+7];
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}
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for (int j = ssize; j < N; j++){
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C[i * N + j] += Aik * 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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}
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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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pthread_t threads[num_threads];
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int thread_args[num_threads];
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int i;
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// TODO: create '_num_threads' pthreads
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for (i=0; i<num_threads; i++){
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thread_args[i] = i;
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pthread_create(&threads[i], NULL, mat_mul_thread, (void *)&thread_args[i]);
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}
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for (i=0; i<num_threads; i++){
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pthread_join(threads[i], NULL);
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}
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}
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