From 182c3d9c7f5caefa417c5249d5836410d0bd3e85 Mon Sep 17 00:00:00 2001
From: pv3e4i5aj <lanjinzi@qq.com>
Date: Sat, 23 Nov 2024 18:08:16 +0800
Subject: [PATCH] Add task2.cpp

---
 task2.cpp | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 task2.cpp

diff --git a/task2.cpp b/task2.cpp
new file mode 100644
index 0000000..8bfa2a3
--- /dev/null
+++ b/task2.cpp
@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <arm_neon.h> //启用 NEON 指令
+#include <ctime>
+#include <stdlib.h>
+
+#define SIZE 1024
+
+void vector_add_optimized(float* A, float* B, float* C, int size)
+{
+	for(int i=0;i<SIZE;i+=4)
+	{
+		//加载A和B向量的4个浮点数到NEO寄存器 
+		float32x4_t vecA=vld1q_f32(&A[i]);
+		float32x4_t vecB=vld1q_f32(&B[i]);
+        //执行向量加法 
+        float32x4_t vecC=vaddq_f32(vecA,vecB);
+        //将结果存储到C向量 
+        vst1q_f32(&C[i],vecC);
+	}
+}
+
+int main()
+{
+	srand(time(NULL));
+
+    // 动态分配内存，并检查是否分配成功
+    float *A = (float *)malloc(SIZE * sizeof(float));
+    float *B = (float *)malloc(SIZE * sizeof(float));
+    float *C = (float *)malloc(SIZE * sizeof(float));
+    // 随机初始化，生成0到99之间的随机浮点数
+    for (int i = 0; i < SIZE; i++) 
+	{
+        A[i] = (float)(rand() % 100) / 100.0f;
+        B[i] = (float)(rand() % 100) / 100.0f;
+    }
+
+    clock_t start = clock();
+    vector_add_optimized(A, B, C, SIZE);
+    clock_t end = clock();
+    // 计算并输出向量加法的时间
+    double time_spent = double(end - start) / CLOCKS_PER_SEC;
+    printf("使用NEON 优化向量加法：\n当SIZE取%d时，初始向量加法时间：%lf秒\n", SIZE,time_spent);
+  
+    // 释放动态分配的内存
+    free(A);free(B);free(C);
+}
\ No newline at end of file