_mm_extract_ps函数替换

函数功能：从results中分别加载其0、1、2、3通道内的数存储到a、b、c、d中。

_mm_extract_ps 详细说明，请参考Intrinsics Guide。

• x86上代码段：

  inline void DoExtractM128(__m128i results, uint32_t *a, uint32_t *b, uint32_t *c, uint32_t *d) { 
  *a = _mm_extract_ps((__v4sf)results, 0); 
  *b = _mm_extract_ps((__v4sf)results, 1); 
  *c = _mm_extract_ps((__v4sf)results, 2); 
  *d = _mm_extract_ps((__v4sf)results, 3); 
  }

• 在鲲鹏上替换后：

  #include <arm_neon.h>
  inline void DoExtractM128(int8x16_t results, uint32_t *a, uint32_t *b, uint32_t *c, uint32_t *d) { 
  *a = vgetq_lane_u32(vreinterpretq_u32_s8(results), 0); 
  *b = vgetq_lane_u32(vreinterpretq_u32_s8(results), 1); 
  *c = vgetq_lane_u32(vreinterpretq_u32_s8(results), 2); 
  *d = vgetq_lane_u32(vreinterpretq_u32_s8(results), 3); 
  }