98 lines
2.6 KiB
C++
98 lines
2.6 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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#include <immintrin.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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#define min(a,b) (a>b? b:a)
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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 id = *(int *)data;
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//printf("id:%d\n", id);
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int slice = M/num_threads;
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int start = id*slice;
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int end = id == num_threads-1? M: (id+1)*slice;
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float Aik;
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int bs = 32;
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/*for (int kk = 0; kk < K; kk += bs) {
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for (int i = start; i < end; ++i) {
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for (int j =0; j < N; j++) {
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int max_k = min(kk+bs, K);
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float acc = 0.0;
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int k;
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for (k = kk; k < (max_k/4)*4; k+=4) {
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acc += A[i*K+k+0] * B[k*N+j];
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acc += A[i*K+k+1] * B[(k+1)*N+j];
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acc += A[i*K+k+2] * B[(k+2)*N+j];
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acc += A[i*K+k+3] * B[(k+3)*N+j];
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}
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for (; k < max_k; k++)
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acc += A[i*K+k] * B[k*N+j];
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C[i*N+j] += acc;
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//for (; 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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for (int kk = 0; kk < K; kk += bs) {
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for (int i = start; i < 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 j;
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for (j =0; j < (N/8)*8; j+=8) {
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C[i*N + j + 0] += Aik * B[k*N + j + 0];
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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 (; 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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/*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 = start; i < 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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for (int j = jj; j < min(jj + bs, 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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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' pthread
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pthread_t *threads;
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threads = (pthread_t *)malloc(sizeof(pthread_t) * _num_threads);
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for(int i=0; i<_num_threads; i++){
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int *pId = (int *)malloc(sizeof(int));
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*pId = i;
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pthread_create(&threads[i], NULL, mat_mul_thread, pId);
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}
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for(int i=0; i<_num_threads; i++)
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pthread_join(threads[i], NULL);
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}
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