src/gromacs/simd/impl_x86_avx2_256/impl_x86_avx2_256_simd_double.h

   1 /*
   2  * This file is part of the GROMACS molecular simulation package.
   3  *
   4  * Copyright (c) 2014,2015, by the GROMACS development team, led by
   5  * Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
   6  * and including many others, as listed in the AUTHORS file in the
   7  * top-level source directory and at http://www.gromacs.org.
   8  *
   9  * GROMACS is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public License
  11  * as published by the Free Software Foundation; either version 2.1
  12  * of the License, or (at your option) any later version.
  13  *
  14  * GROMACS is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with GROMACS; if not, see
  21  * http://www.gnu.org/licenses, or write to the Free Software Foundation,
  22  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA.
  23  *
  24  * If you want to redistribute modifications to GROMACS, please
  25  * consider that scientific software is very special. Version
  26  * control is crucial - bugs must be traceable. We will be happy to
  27  * consider code for inclusion in the official distribution, but
  28  * derived work must not be called official GROMACS. Details are found
  29  * in the README & COPYING files - if they are missing, get the
  30  * official version at http://www.gromacs.org.
  31  *
  32  * To help us fund GROMACS development, we humbly ask that you cite
  33  * the research papers on the package. Check out http://www.gromacs.org.
  34  */
  35
  36 #ifndef GMX_SIMD_IMPL_X86_AVX2_256_SIMD_DOUBLE_H
  37 #define GMX_SIMD_IMPL_X86_AVX2_256_SIMD_DOUBLE_H
  38
  39 #include "config.h"
  40
  41 #include <immintrin.h>
  42
  43 #include "gromacs/simd/impl_x86_avx_256/impl_x86_avx_256_simd_double.h"
  44
  45 namespace gmx
  46 {
  47
  48 static inline SimdDouble gmx_simdcall
  49 fma(SimdDouble a, SimdDouble b, SimdDouble c)
  50 {
  51     return {
  52                _mm256_fmadd_pd(a.simdInternal_, b.simdInternal_, c.simdInternal_)
  53     };
  54 }
  55
  56 static inline SimdDouble gmx_simdcall
  57 fms(SimdDouble a, SimdDouble b, SimdDouble c)
  58 {
  59     return {
  60                _mm256_fmsub_pd(a.simdInternal_, b.simdInternal_, c.simdInternal_)
  61     };
  62 }
  63
  64 static inline SimdDouble gmx_simdcall
  65 fnma(SimdDouble a, SimdDouble b, SimdDouble c)
  66 {
  67     return {
  68                _mm256_fnmadd_pd(a.simdInternal_, b.simdInternal_, c.simdInternal_)
  69     };
  70 }
  71
  72 static inline SimdDouble gmx_simdcall
  73 fnms(SimdDouble a, SimdDouble b, SimdDouble c)
  74 {
  75     return {
  76                _mm256_fnmsub_pd(a.simdInternal_, b.simdInternal_, c.simdInternal_)
  77     };
  78 }
  79
  80 static inline SimdDBool gmx_simdcall
  81 testBits(SimdDouble a)
  82 {
  83     __m256i ia  = _mm256_castpd_si256(a.simdInternal_);
  84     __m256i res = _mm256_andnot_si256( _mm256_cmpeq_epi64(ia, _mm256_setzero_si256()), _mm256_cmpeq_epi64(ia, ia));
  85
  86     return {
  87                _mm256_castsi256_pd(res)
  88     };
  89 }
  90
  91 static inline SimdDouble
  92 frexp(SimdDouble value, SimdDInt32 * exponent)
  93 {
  94     const __m256d  exponentMask = _mm256_castsi256_pd(_mm256_set1_epi64x(0x7FF0000000000000LL));
  95     const __m256d  mantissaMask = _mm256_castsi256_pd( _mm256_set1_epi64x(0x800FFFFFFFFFFFFFLL));
  96     const __m256i  exponentBias = _mm256_set1_epi64x(1022LL); // add 1 to make our definition identical to frexp()
  97     const __m256d  half         = _mm256_set1_pd(0.5);
  98     __m256i        iExponent;
  99     __m128i        iExponent128;
 100
 101     iExponent = _mm256_castpd_si256(_mm256_and_pd(value.simdInternal_, exponentMask));
 102     iExponent = _mm256_sub_epi64(_mm256_srli_epi64(iExponent, 52), exponentBias);
 103     iExponent = _mm256_shuffle_epi32(iExponent, _MM_SHUFFLE(3, 1, 2, 0));
 104
 105     iExponent128             = _mm256_extractf128_si256(iExponent, 1);
 106     exponent->simdInternal_  = _mm_unpacklo_epi64(_mm256_castsi256_si128(iExponent), iExponent128);
 107
 108     return {
 109                _mm256_or_pd(_mm256_and_pd(value.simdInternal_, mantissaMask), half)
 110     };
 111 }
 112
 113 static inline SimdDouble
 114 ldexp(SimdDouble value, SimdDInt32 exponent)
 115 {
 116     const __m256i  exponentBias = _mm256_set1_epi64x(1023LL);
 117     __m256i        iExponent    = _mm256_cvtepi32_epi64(exponent.simdInternal_);
 118
 119     iExponent = _mm256_slli_epi64(_mm256_add_epi64(iExponent, exponentBias), 52);
 120     return {
 121                _mm256_mul_pd(value.simdInternal_, _mm256_castsi256_pd(iExponent))
 122     };
 123 }
 124
 125 }      // namespace gmx
 126
 127 #endif // GMX_SIMD_IMPL_X86_AVX2_256_SIMD_DOUBLE_H