Function nearest_int

src/quant.cpp:34–39

#define GROUP_MAX_EPS 1e-15f

static inline int nearest_int(float fval) {
  assert(fabsf(fval) <= 4194303.f);
  float val = fval + 12582912.f;
  int i; memcpy(&i, &val, sizeof(int));
  return (i & 0x007fffff) - 0x00400000;
}

// some compilers don't provide _mm256_set_m128i, e.g. gcc 7
#define MM256_SET_M128I(a, b) _mm256_insertf128_si256(_mm256_castsi128_si256(b), (a), 1)