79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
#include "mat_mul.h"
|
|
#include <cstdlib>
|
|
#include <cstdio>
|
|
#include <pthread.h>
|
|
#include <algorithm>
|
|
|
|
static float *A, *B, *C;
|
|
static int M, N, K;
|
|
static int num_threads;
|
|
|
|
static void* mat_mul_thread(void *data) {
|
|
// TODO: parallelize & optimize matrix multiplication
|
|
int pid = *(int *)data;
|
|
|
|
int slice = M / num_threads;
|
|
int start = pid * slice;
|
|
int end = pid == num_threads - 1 ? M : (pid + 1) * slice;
|
|
|
|
int bs = 32;
|
|
for(int kk = 0; kk < K; kk += bs) {
|
|
for(int i = start; i < end; ++i) {
|
|
for(int k = kk; k < std::min(kk+bs, K); ++k) {
|
|
float Aik = A[i*K + k];
|
|
int j = 0;
|
|
for(; j < N-7; j += 8) {
|
|
C[i*N + j] += Aik * B[k*N + j];
|
|
C[i*N + j + 1] += Aik * B[k*N + j + 1];
|
|
C[i*N + j + 2] += Aik * B[k*N + j + 2];
|
|
C[i*N + j + 3] += Aik * B[k*N + j + 3];
|
|
C[i*N + j + 4] += Aik * B[k*N + j + 4];
|
|
C[i*N + j + 5] += Aik * B[k*N + j + 5];
|
|
C[i*N + j + 6] += Aik * B[k*N + j + 6];
|
|
C[i*N + j + 7] += Aik * B[k*N + j + 7];
|
|
}
|
|
for(; j < N; ++j)
|
|
C[i*N + j] += Aik * B[k*N + j];
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
float Aik;
|
|
int bs = 32;
|
|
for (int kk = 0; kk < K; kk += bs) {
|
|
for (int jj = 0; jj < N; jj += bs) {
|
|
for (int i = start; i < end; ++i) {
|
|
for (int k = kk; k < std::min(kk + bs, K); ++k) {
|
|
Aik = A[i * K + k];
|
|
for (int j = jj; j < std::min(jj + bs, N); ++j) {
|
|
C[i * N + j] += Aik * B[k * N + j];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
*/
|
|
free(data);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void mat_mul(float *_A, float *_B, float *_C, int _M, int _N, int _K, int _num_threads) {
|
|
A = _A, B = _B, C = _C;
|
|
M = _M, N = _N, K = _K;
|
|
num_threads = _num_threads;
|
|
|
|
// TODO: create '_num_threads' pthreads
|
|
pthread_t threads[num_threads];
|
|
|
|
for (int i = 0; i < num_threads; i++) {
|
|
int * pid = (int *) malloc(sizeof(int));
|
|
*pid = i;
|
|
pthread_create(&threads[i], NULL, mat_mul_thread, pid);
|
|
}
|
|
|
|
for (int i = 0; i < num_threads; i++) {
|
|
pthread_join(threads[i], NULL);
|
|
}
|
|
}
|