#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>  
#include <stdlib.h>  
#include <time.h>  
#include <arm_neon.h>  

#define SIZE 1024  
 
void matmul(float** A, float** B, float** C, int n) {
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            C[i][j] = 0;  
            for (int k = 0; k < n; k++) {
                C[i][j] += A[i][k] * B[k][j]; 
            }
        }
    }
}

void matmul_optimized(float** A, float** B, float** C, int n) {
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            float32x4_t vecC = vdupq_n_f32(0);  
            for (int k = 0; k < n; k += 4) {  
                float32x4_t vecA = vld1q_f32(&A[i][k]);
                float32x4_t vecB = vld1q_f32(&B[k][j]);

                vecC = vmlaq_f32(vecC, vecA, vecB);
            }
            C[i][j] = vgetq_lane_f32(vecC, 0) + vgetq_lane_f32(vecC, 1) +
                vgetq_lane_f32(vecC, 2) + vgetq_lane_f32(vecC, 3);
        }
    }
}


int main() {
    float** A = (float**)malloc(SIZE * sizeof(float*));
    float** B = (float**)malloc(SIZE * sizeof(float*));
    float** C = (float**)malloc(SIZE * sizeof(float*));

    for (int i = 0; i < SIZE; i++) {
        A[i] = (float*)malloc(SIZE * sizeof(float));
        B[i] = (float*)malloc(SIZE * sizeof(float));
        C[i] = (float*)malloc(SIZE * sizeof(float));
    }

    srand((unsigned)time(NULL));

    for (int i = 0; i < SIZE; i++) {
        for (int j = 0; j < SIZE; j++) {
            A[i][j] = rand() % 100;  
            B[i][j] = rand() % 100;  
        }
    }

    clock_t start = clock();  

    matmul(A, B, C, SIZE);

    clock_t end = clock();  

    double time_taken = (double)(end - start) / CLOCKS_PER_SEC;  
    printf("基础矩阵乘法的运行时间: %f 秒\n", time_taken);

    for (int i = 0; i < SIZE; i++) {
        free(A[i]);
        free(B[i]);
        free(C[i]);
    }
    free(A);
    free(B);
    free(C);

    return 0;
}