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48 lines
1.5 KiB
48 lines
1.5 KiB
#include <stdio.h>
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#include <stdlib.h>
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#include <ctime>
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#define SIZE 1024
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void matmul(float** A, float** B, float** C, int n) {
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for (int i = 0; i < n; i++) {
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for (int j = 0; j < n; j++) {
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float sum = 0;
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for (int k = 0; k < n; k++) {
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sum += A[i][k] * B[k][j];}
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C[i][j] = sum;}
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}
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}
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int main() {
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float** A = (float**)malloc(SIZE * sizeof(float*));
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for (int i = 0; i < SIZE; i++) {
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A[i] = (float*)malloc(SIZE * sizeof(float));
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}
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float** B = (float**)malloc(SIZE * sizeof(float*));
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for (int i = 0; i < SIZE; i++) {
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B[i] = (float*)malloc(SIZE * sizeof(float));
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}
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float** C = (float**)malloc(SIZE * sizeof(float*));
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for (int i = 0; i < SIZE; i++) {
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C[i] = (float*)malloc(SIZE * sizeof(float));
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}
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for (int i = 0; i < SIZE; i++) {
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for (int j = 0; j < SIZE; j++) {
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A[i][j] = (float)(rand() % 100);
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B[i][j] = (float)(rand() % 100);
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}
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}
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clock_t start_time = clock();
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matmul(A, B, C, SIZE);
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clock_t end_time = clock();
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double elapsed_time = (double)(end_time - start_time) / CLOCKS_PER_SEC;
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printf("time: %lf s\n", elapsed_time);
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for (int i = 0; i < SIZE; i++) {
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free(A[i]);}
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free(A);
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for (int i = 0; i < SIZE; i++) {
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free(B[i]);}
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free(B);
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for (int i = 0; i < SIZE; i++) {
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free(C[i]);}
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free(C);
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return 0;
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} |