/usr/include/gromacs/gmx_avx_single.h is in gromacs-dev 4.6.5-1build1.
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#ifndef _gmx_avx_single_h_
#define _gmx_avx_single_h_
/* We require AVX now! */
#include <immintrin.h> /* AVX */
static inline __m256
gmx_mm256_invsqrt_ps(__m256 x)
{
const __m256 half = _mm256_set_ps(0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5);
const __m256 three = _mm256_set_ps(3.0, 3.0, 3.0, 3.0, 3.0, 3.0, 3.0, 3.0);
__m256 lu = _mm256_rsqrt_ps(x);
return _mm256_mul_ps(half, _mm256_mul_ps(_mm256_sub_ps(three, _mm256_mul_ps(_mm256_mul_ps(lu, lu), x)), lu));
}
static inline __m256
gmx_mm256_calc_rsq_ps(__m256 dx, __m256 dy, __m256 dz)
{
return _mm256_add_ps( _mm256_add_ps( _mm256_mul_ps(dx, dx), _mm256_mul_ps(dy, dy) ), _mm256_mul_ps(dz, dz) );
}
/* Normal sum of four xmm registers */
#define gmx_mm256_sum4_ps(t0, t1, t2, t3) _mm256_add_ps(_mm256_add_ps(t0, t1), _mm256_add_ps(t2, t3))
#endif /* gmx_avx_single_h_ */
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