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52 lines
1.1 KiB
52 lines
1.1 KiB
#define _CRT_SECURE_NO_WARNINGS
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <arm_neon.h>
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#define SIZE 1024
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void vector_add(float* A, float* B, float* C, int size) {
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for (int i = 0; i < size; ++i) {
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C[i] = A[i] + B[i];
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}
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}
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void vector_add_optimized(float* A, float* B, float* C, int size) {
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int i;
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for (i = 0; i <= size - 4; i += 4) {
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float32x4_t a_vec = vld1q_f32(&A[i]);
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float32x4_t b_vec = vld1q_f32(&B[i]);
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float32x4_t c_vec = vaddq_f32(a_vec, b_vec);
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vst1q_f32(&C[i], c_vec);
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}
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for (; i < size; ++i) {
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C[i] = A[i] + B[i];
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}
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}
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int main() {
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float A[SIZE], B[SIZE], C[SIZE];
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srand(time(NULL));
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for (int i = 0; i < SIZE; ++i) {
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A[i] = rand() % 100;
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B[i] = rand() % 100;
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}
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clock_t start = clock();
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vector_add_optimized(A, B, C, SIZE);
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clock_t end = clock();
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double time_taken = (double)(end - start) / CLOCKS_PER_SEC;
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printf("NEON优化的向量加法的运行时间: %e 秒\n", time_taken);
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return 0;
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} |