累加数组内起始元素到制定个数元素的累加和： uint32_t vector_add_of_n(uint32_t *ptr, uint32_t nitems) {     uint32_t result, *i;     uint32x2_t vec64a, vec64b;     uint32x4_t vec128 = vdupq_n_u32(0);     for (i = ptr; i 15) + 1) 1; } 彩色转灰度：（C） void reference_convert (uint8_t * __restrict dest, uint8_t * __restrict src, int n) {   int i;   for (i=0; i8);   } } void neon_convert (uint8_t * __restrict dest, uint8_t * __restrict src, int n) {   int i;   uint8x8_t **c = vdup_n_u8 (77);   uint8x8_t gfac = vdup_n_u8 (151);   uint8x8_t bfac = vdup_n_u8 (28);   n/=8;   for (i=0; i