src/gromacs/simd/impl_ibm_vsx/impl_ibm_vsx_definitions.h

   1 /*
   2  * This file is part of the GROMACS molecular simulation package.
   3  *
   4  * Copyright (c) 2014,2015,2017,2018,2019,2020, 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_IMPLEMENTATION_IBM_VSX_DEFINITIONS_H
  37 #define GMX_SIMD_IMPLEMENTATION_IBM_VSX_DEFINITIONS_H
  38
  39 // IBM VSX SIMD instruction wrappers. Power7 and later.
  40 //
  41 // While this instruction set is similar to VMX, there are quite a few differences
  42 // that make it easier to understand if we start from scratch rather than by
  43 // including the VMX implementation and changing lots of things.
  44
  45 #include <altivec.h>
  46
  47 #if defined(__GNUC__) && !defined(__ibmxl__) && !defined(__xlC__)
  48 // According to G++ documentation, when using VSX in C++ we
  49 // must undefine vector & bool macros after including altivec.h
  50 #    undef vector
  51 #    undef bool
  52 #    define vsxBool __bool
  53 #else
  54 // We cannot undefine bool on xlc, but somehow it works anyway
  55 #    define vsxBool bool
  56 #endif
  57
  58 #define GMX_SIMD 1
  59 #define GMX_SIMD_HAVE_FLOAT 1
  60 // GMX_SIMD_HAVE_DOUBLE is conditionally defined further down
  61 #define GMX_SIMD_HAVE_LOADU 1
  62 #define GMX_SIMD_HAVE_STOREU 1
  63 #define GMX_SIMD_HAVE_LOGICAL 1
  64 #define GMX_SIMD_HAVE_FMA 1
  65 #define GMX_SIMD_HAVE_FINT32_EXTRACT 1
  66 #define GMX_SIMD_HAVE_FINT32_LOGICAL 1
  67 #define GMX_SIMD_HAVE_FINT32_ARITHMETICS 1
  68 // GMX_SIMD_HAVE_DINT32_EXTRACT is conditionally defined further down
  69 // GMX_SIMD_HAVE_DINT32_LOGICAL is conditionally defined further down
  70 // GMX_SIMD_HAVE_DINT32_ARITHMETICS is conditionally defined further down
  71 #define GMX_SIMD_HAVE_NATIVE_COPYSIGN_FLOAT 1
  72 #define GMX_SIMD_HAVE_NATIVE_RSQRT_ITER_FLOAT 0
  73 #define GMX_SIMD_HAVE_NATIVE_RCP_ITER_FLOAT 0
  74 #define GMX_SIMD_HAVE_NATIVE_LOG_FLOAT 0
  75 #define GMX_SIMD_HAVE_NATIVE_EXP2_FLOAT 0
  76 #define GMX_SIMD_HAVE_NATIVE_EXP_FLOAT 0
  77 #define GMX_SIMD_HAVE_NATIVE_COPYSIGN_DOUBLE 1
  78 #define GMX_SIMD_HAVE_NATIVE_RSQRT_ITER_DOUBLE 0
  79 #define GMX_SIMD_HAVE_NATIVE_RCP_ITER_DOUBLE 0
  80 #define GMX_SIMD_HAVE_NATIVE_LOG_DOUBLE 0
  81 #define GMX_SIMD_HAVE_NATIVE_EXP2_DOUBLE 0
  82 #define GMX_SIMD_HAVE_NATIVE_EXP_DOUBLE 0
  83 #define GMX_SIMD_HAVE_GATHER_LOADU_BYSIMDINT_TRANSPOSE_FLOAT 1
  84 // GMX_SIMD_HAVE_GATHER_LOADU_BYSIMDINT_TRANSPOSE_DOUBLE is conditionally defined further down
  85 #define GMX_SIMD_HAVE_HSIMD_UTIL_FLOAT 0  // No need for half-simd, width is 4
  86 #define GMX_SIMD_HAVE_HSIMD_UTIL_DOUBLE 0 // No need for half-simd, width is 2
  87 #define GMX_SIMD4_HAVE_FLOAT 1
  88 #define GMX_SIMD4_HAVE_DOUBLE 0
  89
  90 // With GCC, only version 4.9 or later supports all parts of double precision VSX.
  91 // We check explicitly for xlc, since that compiler appears to like pretending it is gcc,
  92 // but there double precision seems to work fine.
  93 #if defined(__ibmxl__) || defined(__xlC__) \
  94         || !(defined(__GNUC__) && ((__GNUC__ < 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ < 9))))
  95 #    define GMX_SIMD_HAVE_DOUBLE 1
  96 #    define GMX_SIMD_HAVE_DINT32_EXTRACT 1
  97 #    define GMX_SIMD_HAVE_DINT32_LOGICAL 1
  98 #    define GMX_SIMD_HAVE_DINT32_ARITHMETICS 1
  99 #    define GMX_SIMD_HAVE_GATHER_LOADU_BYSIMDINT_TRANSPOSE_DOUBLE 1
 100 #else
 101 #    define GMX_SIMD_HAVE_DOUBLE 0
 102 #    define GMX_SIMD_HAVE_DINT32_EXTRACT 0
 103 #    define GMX_SIMD_HAVE_DINT32_LOGICAL 0
 104 #    define GMX_SIMD_HAVE_DINT32_ARITHMETICS 0
 105 #    define GMX_SIMD_HAVE_GATHER_LOADU_BYSIMDINT_TRANSPOSE_DOUBLE 0
 106 #endif
 107
 108 // Implementation details
 109 #define GMX_SIMD_FLOAT_WIDTH 4
 110 #define GMX_SIMD_DOUBLE_WIDTH 2
 111 #define GMX_SIMD_FINT32_WIDTH 4
 112 #define GMX_SIMD_DINT32_WIDTH 2
 113 #define GMX_SIMD4_WIDTH 4
 114 #define GMX_SIMD_ALIGNMENT 16 // Bytes (4*single or 2*sdouble)
 115 #define GMX_SIMD_RSQRT_BITS 14
 116 #define GMX_SIMD_RCP_BITS 14
 117
 118
 119 #endif /* GMX_SIMD_IMPLEMENTATION_IBM_VSX_COMMON_H */