ADD file via upload

Chen/CHEN_4.c

@@ -0,0 +1,59 @@
+#include <arm_neon.h>
+#include <stdio.h>
+#include <time.h>
+#include <stdlib.h>
+#define SIZE 1024
+
+void matmul_optimized(float** A, float** B, float** C, int n);
+int main() {
+	int n = SIZE;
+
+	// 分配内存空间
+	float** A = (float**)malloc(sizeof(float*) * n);
+	float** B = (float**)malloc(sizeof(float*) * n);
+	float** C = (float**)malloc(sizeof(float*) * n);
+	int i, j;
+	for(i=0; i<n; i++) {
+		A[i] = (float*)malloc(sizeof(float) * n);
+		B[i] = (float*)malloc(sizeof(float) * n);
+		C[i] = (float*)malloc(sizeof(float) * n);
+	}
+	
+	// 随机化
+	srand(time(0));
+	for(i=0; i<n; i++)
+	for(j=0; j<n; j++) {
+		A[i][j] = rand() % 100;
+		B[i][j] = rand() % 100;
+	}
+
+	// 计算并计时
+	clock_t start = clock();
+	matmul_optimized(A, B, C, SIZE);
+	clock_t end = clock();
+	printf("使用 NEON 优化稠密矩阵乘法时间：%lf\n", (double)(end-start) / CLOCKS_PER_SEC);
+
+	// 释放内存空间
+	for(i=0; i<n; i++) {
+		free(A[i]);
+		free(B[i]);
+		free(C[i]);
+	}
+	free(A); free(B); free(C);
+}
+
+void matmul_optimized(float** A, float** B, float** C, int n) {
+	int i, j, k;
+	float32x4_t vecA, vecB, vecC;
+	for(i=0; i<n; i++)
+	for(j=0; j<n; j++) {
+		vecC = vdupq_n_f32(0.0);
+		for(k=0; k<n; k+=4) {
+			vecA = vld1q_f32(&A[i][k]);
+			vecB = vld1q_f32(&A[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);
+	}
+}