src/gmxlib/thread_mpi/tmpi_ops.c

   1 /*
   2 This source code file is part of thread_mpi.
   3 Written by Sander Pronk, Erik Lindahl, and possibly others.
   4
   5 Copyright (c) 2009, Sander Pronk, Erik Lindahl.
   6 All rights reserved.
   7
   8 Redistribution and use in source and binary forms, with or without
   9 modification, are permitted provided that the following conditions are met:
  10 1) Redistributions of source code must retain the above copyright
  11    notice, this list of conditions and the following disclaimer.
  12 2) Redistributions in binary form must reproduce the above copyright
  13    notice, this list of conditions and the following disclaimer in the
  14    documentation and/or other materials provided with the distribution.
  15 3) Neither the name of the copyright holders nor the
  16    names of its contributors may be used to endorse or promote products
  17    derived from this software without specific prior written permission.
  18
  19 THIS SOFTWARE IS PROVIDED BY US ''AS IS'' AND ANY
  20 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  21 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22 DISCLAIMED. IN NO EVENT SHALL WE BE LIABLE FOR ANY
  23 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  24 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  26 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  28 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29
  30 If you want to redistribute modifications, please consider that
  31 scientific software is very special. Version control is crucial -
  32 bugs must be traceable. We will be happy to consider code for
  33 inclusion in the official distribution, but derived work should not
  34 be called official thread_mpi. Details are found in the README & COPYING
  35 files.
  36 */
  37
  38
  39 #ifdef THREAD_MPI_OPS
  40
  41 /* cpp wizardry follows...
  42
  43 This file is #included directly from thread_mpi.c, and constructs
  44 MPI_Reduce operators.
  45
  46 What this does is create the min, max, sum, prod, etc. functions for a given
  47 datatype (pre-defined as TYPE, with identifier name TYPENM) and puts pointers
  48 to these functions in an array called oplist_TYPENM.
  49
  50 gmx_thread_mpi_reduce.c includes this file once for each type used by MPI,
  51 and thus builds up a set of arrays of function pointers, that then get used
  52 in the mpi_datatype_ structure. This way, each operation/datatype entry
  53 that makes sense can be extracted easily. Note that we don't (yet) support
  54 user-defined ops */
  55
  56 #define FNAMEr(tp,fn) tMPI_##tp##_##fn
  57 #define FNAME(tp,fn) FNAMEr(tp,fn)
  58
  59 /* macros to define functions and prototypes based on a name and an operation */
  60 #define FNr(tp,fname,fn) \
  61 static void tMPI_##tp##_##fname  (void *dest, void *src_a, void *src_b, \
  62                                   int count) \
  63 { \
  64     /*printf("in function %s, count=%d\n", __FUNCTION__, count);*/\
  65     TYPE *a=(TYPE*)src_a; \
  66     TYPE *b=(TYPE*)src_b; \
  67     TYPE *d=(TYPE*)dest; \
  68     int i; \
  69     for(i=0;i<count;i++) \
  70         d[i]=(TYPE)(fn(a[i],b[i])); \
  71 }
  72
  73 #define FN(tp,fname,fn) FNr(tp,fname,fn)
  74
  75 #define OPFNr(tp,fname,operator)  \
  76 static void tMPI_##tp##_##fname  (void *dest, void *src_a, void *src_b, \
  77                                   int count) \
  78 { \
  79     /*printf("in function %s, count=%d\n", __FUNCTION__, count);*/\
  80     TYPE *a=(TYPE*)src_a; \
  81     TYPE *b=(TYPE*)src_b; \
  82     TYPE *d=(TYPE*)dest; \
  83     int i; \
  84     for(i=0;i<count;i++) \
  85         d[i]=(TYPE)(a[i] operator b[i]); \
  86 }
  87
  88 #define OPFN(tp,fname,operator) OPFNr(tp,fname,operator)
  89
  90
  91 /* these are the function prototypes + definitions: */
  92 #define MAX(a, b)  (( (a) > (b) ) ? (a) : (b))
  93 FN(TYPENM,max,MAX)
  94 #undef MAX
  95 #define MIN(a, b)  (( (a) < (b) ) ? (a) : (b))
  96 FN(TYPENM,min,MIN)
  97 #undef MIN
  98 OPFN(TYPENM,sum,+)
  99 OPFN(TYPENM,prod,*)
 100 #if INTTYPE!=0
 101 OPFN(TYPENM,land,&&)
 102 OPFN(TYPENM,band,&)
 103 OPFN(TYPENM,lor,||)
 104 OPFN(TYPENM,bor,|)
 105 OPFN(TYPENM,bxor,^)
 106 #define XOR(a, b)  ( (!a) ^ (!b) )
 107 FN(TYPENM,lxor,XOR)
 108 #undef XOR
 109 #endif
 110
 111 #define OPARRAYr(tp) oplist_##tp
 112 #define OPARRAY(tp) OPARRAYr(tp)
 113
 114 tMPI_Op_fn OPARRAY(TYPENM)[] = {
 115     FNAME(TYPENM,max),
 116     FNAME(TYPENM,min),
 117     FNAME(TYPENM,sum),
 118     FNAME(TYPENM,prod),
 119 #if INTTYPE
 120     FNAME(TYPENM,land),
 121     FNAME(TYPENM,band),
 122     FNAME(TYPENM,lor),
 123     FNAME(TYPENM,bor),
 124     FNAME(TYPENM,lxor),
 125     FNAME(TYPENM,bxor)
 126 #else
 127     0,
 128     0,
 129     0,
 130     0,
 131     0,
 132     0
 133 #endif
 134 };
 135
 136
 137 #undef FNAME
 138 #undef FNAMEr
 139 #undef OPARRAYr
 140 #undef OPARRAY
 141 #undef FN
 142 #undef FNr
 143 #undef OPFN
 144 #undef OPFNr
 145
 146 #undef TYPE
 147 #undef TYPENM
 148 #undef INTTYPE
 149
 150 #endif