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步骤七-加法.cpp

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+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <arm_neon.h>
+
+#define SIZE 1024
+
+
+void vector_add_optimized(float* A, float* B, float* C, int size) {
+    int i;
+    for (i = 0; i < size - 3; i += 4) {
+        
+        float32x4_t A_vec = vld1q_f32(A + i);
+        float32x4_t B_vec = vld1q_f32(B + i);
+        
+        float32x4_t C_vec = vaddq_f32(A_vec, B_vec);
+        
+        vst1q_f32(C + i, C_vec);
+    }
+    
+    for (; i < size; i++) {
+        C[i] = A[i] + B[i];
+    }
+}
+
+void vector_add(float* A, float* B, float* C, int size) {
+    for (int i = 0; i < size; i++) {
+        C[i] = A[i] + B[i];
+    }
+}
+
+int main() {
+    float A[SIZE], B[SIZE], C[SIZE];
+    srand(time(NULL)); 
+
+   
+    for (int i = 0; i < SIZE; i++) {
+        A[i] = rand() % 100;
+        B[i] = rand() % 100;
+    }
+
+    
+    clock_t start1, end1, start2, end2;
+
+    start1 = clock();
+    vector_add(A, B, C, SIZE);
+    end1 = clock();
+
+    start2 = clock(); 
+
+    vector_add_optimized(A, B, C, SIZE);
+
+    end2 = clock(); 
+    for (int i = 0; i < 9; i++) {
+        printf("A[%d] + B[%d] = %d\n", i, i, C[i]);
+    }
+    double time_spent1 = (double)(end1 - start1) / CLOCKS_PER_SEC;
+
+    printf("基础向量加法的运行时间为: %e 秒\n", time_spent1);
+
+    double time_spent = (double)(end2 - start2) / CLOCKS_PER_SEC; 
+
+    printf("NEON优化向量加法的运行时间为: %e 秒\n", time_spent);
+
+    return 0;
+}