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matrix_multiplication.c

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+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <arm_neon.h>
+
+#define SIZE 512
+
+// 基础矩阵乘法
+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];
+            }
+        }
+    }
+}
+
+// NEON 优化矩阵乘法
+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 sum = vmovq_n_f32(0);
+            for (int k = 0; k <= n - 4; k += 4) {
+                float32x4_t vecA = vld1q_f32(&A[i][k]);
+                float32x4_t vecB = vld1q_f32(&B[k][j]);
+                sum = vmlaq_f32(sum, vecA, vecB);
+            }
+            C[i][j] = vgetq_lane_f32(sum, 0) + vgetq_lane_f32(sum, 1) +
+                      vgetq_lane_f32(sum, 2) + vgetq_lane_f32(sum, 3);
+            for (int k = (n / 4) * 4; k < n; k++) {
+                C[i][j] += A[i][k] * B[k][j];
+            }
+        }
+    }
+}
+
+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(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, end;
+
+    // 基础矩阵乘法
+    start = clock();
+    matmul(A, B, C, SIZE);
+    end = clock();
+    printf("基础矩阵乘法时间: %f 秒\n", (double)(end - start) / CLOCKS_PER_SEC);
+
+    // NEON 优化矩阵乘法
+    start = clock();
+    matmul_optimized(A, B, C, SIZE);
+    end = clock();
+    printf("NEON 优化矩阵乘法时间: %f 秒\n", (double)(end - start) / CLOCKS_PER_SEC);
+
+    for (int i = 0; i < SIZE; i++) {
+        free(A[i]);
+        free(B[i]);
+        free(C[i]);
+    }
+    free(A);
+    free(B);
+    free(C);
+
+    return 0;
+}