96 lines
2.4 KiB
C++
96 lines
2.4 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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#define MAX_NUM_THREAD 100
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#define BLOCK_SIZE 45
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#define UNROLL_SIZE 8
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#define MIN(a,b) ((a < b) ? (a) : (b))
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#define likely(x) __builtin_expect((x),1)
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#define unlikely(x) __builtin_expect((x),0)
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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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typedef struct _thread_param_ {
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int pid;
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} _thread_param;
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static void* mat_mul_thread(void *data) {
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_thread_param *tp = (_thread_param*)data;
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int pid = tp->pid;
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int pslice = M / num_threads;
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int m_start = pid * pslice;
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int m_end = pid == num_threads - 1 ? M : (pid + 1) * pslice;
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#if defined(USE_MATRIX_UNROLL)
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register int q = (N / UNROLL_SIZE) * UNROLL_SIZE, r = N & (UNROLL_SIZE-1);
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#endif
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register float Aik;
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register int kk, i, k, j;
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register int bs = BLOCK_SIZE;
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for (kk = 0; kk < K; kk += bs) {
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for (i = m_start; likely(i < m_end); ++i) {
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for (k = kk; k < MIN(kk + bs, K); ++k) {
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Aik = A[i * K + k];
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//__builtin_prefetch(&B[k * N], 0);
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#if defined(USE_MATRIX_UNROLL)
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for (j = 0; likely(j < q); j += UNROLL_SIZE) {
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#else
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for (j = 0; j < N; j++ ) {
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#endif
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C[i * N + j] += Aik * B[k * N + j];
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#if defined(USE_MATRIX_UNROLL)
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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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#endif
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}
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#if defined(USE_MATRIX_UNROLL)
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for (register int t = j; t < q + r; ++t ) {
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C[i * N + t] += Aik * B[k * N + t];
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}
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#endif
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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[MAX_NUM_THREAD];
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_thread_param tparam[MAX_NUM_THREAD];
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int i;
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if (num_threads > M) {
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num_threads = M;
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}
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for (i = 0; i < num_threads; i++) {
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tparam[i].pid = i;
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pthread_create(&thread[i], NULL, mat_mul_thread, &tparam[i]);
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}
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for (i = 0; i < num_threads; i++) {
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pthread_join(thread[i], NULL);
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}
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}
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