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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
*
* Copyright (C) 1997 University of Chicago.
* See COPYRIGHT notice in top-level directory.
*/
#include "adio.h"
#include "adio_extern.h"
int ADIO_Type_create_subarray(int ndims,
int *array_of_sizes,
int *array_of_subsizes,
int *array_of_starts,
int order,
MPI_Datatype oldtype,
MPI_Datatype *newtype)
{
MPI_Aint extent, disps[3], size;
int i, blklens[3];
MPI_Datatype tmp1, tmp2, types[3];
MPI_Type_extent(oldtype, &extent);
if (order == MPI_ORDER_FORTRAN) {
/* dimension 0 changes fastest */
if (ndims == 1) {
MPI_Type_contiguous(array_of_subsizes[0], oldtype, &tmp1);
}
else {
MPI_Type_vector(array_of_subsizes[1],
array_of_subsizes[0],
array_of_sizes[0], oldtype, &tmp1);
size = (MPI_Aint)array_of_sizes[0]*extent;
for (i=2; i<ndims; i++) {
size *= (MPI_Aint)array_of_sizes[i-1];
MPI_Type_hvector(array_of_subsizes[i], 1, size, tmp1, &tmp2);
MPI_Type_free(&tmp1);
tmp1 = tmp2;
}
}
/* add displacement and UB */
disps[1] = array_of_starts[0];
size = 1;
for (i=1; i<ndims; i++) {
size *= (MPI_Aint)array_of_sizes[i-1];
disps[1] += size*(MPI_Aint)array_of_starts[i];
}
/* rest done below for both Fortran and C order */
}
else /* order == MPI_ORDER_C */ {
/* dimension ndims-1 changes fastest */
if (ndims == 1) {
MPI_Type_contiguous(array_of_subsizes[0], oldtype, &tmp1);
}
else {
MPI_Type_vector(array_of_subsizes[ndims-2],
array_of_subsizes[ndims-1],
array_of_sizes[ndims-1], oldtype, &tmp1);
size = (MPI_Aint)array_of_sizes[ndims-1]*extent;
for (i=ndims-3; i>=0; i--) {
size *= (MPI_Aint)array_of_sizes[i+1];
MPI_Type_hvector(array_of_subsizes[i], 1, size, tmp1, &tmp2);
MPI_Type_free(&tmp1);
tmp1 = tmp2;
}
}
/* add displacement and UB */
disps[1] = array_of_starts[ndims-1];
size = 1;
for (i=ndims-2; i>=0; i--) {
size *= (MPI_Aint)array_of_sizes[i+1];
disps[1] += size*(MPI_Aint)array_of_starts[i];
}
}
disps[1] *= extent;
disps[2] = extent;
for (i=0; i<ndims; i++) disps[2] *= (MPI_Aint)array_of_sizes[i];
disps[0] = 0;
blklens[0] = blklens[1] = blklens[2] = 1;
types[0] = MPI_LB;
types[1] = tmp1;
types[2] = MPI_UB;
MPI_Type_struct(3, blklens, disps, types, newtype);
MPI_Type_free(&tmp1);
return MPI_SUCCESS;
}
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