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/*
Copyright (C) 2008-2015 Michele Martone
This file is part of librsb.
librsb is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
librsb is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public
License along with librsb; see the file COPYING.
If not, see <http://www.gnu.org/licenses/>.
*/
/* @cond INNERDOC */
/**
* @file
* @author Michele Martone
* @brief
*
* BLAS like stuff
* */
#include "rsb_blas_stuff.h"
RSB_INTERNALS_COMMON_HEAD_DECLS
void rsb__BLAS_Xaxpy_parallel(rsb_int_t n, const void *alphap, void * a, rsb_int_t inca, const void * b, rsb_int_t incb, rsb_type_t typecode)
{
/**
\ingroup gr_internals
alphap can be NULL
a <- a + alpha * b
*/
const rsb_nnz_idx_t wet = rsb_get_num_threads(); /* want executing threads */
if(RSB_UNLIKELY(n<wet*RSB_MIN_THREAD_XAXPY_NNZ))/* at least RSB_MIN_THREAD_MEMCPY_NNZ nnz to trigger memcpy */
{
rsb__cblas_Xaxpy(typecode,n,alphap,b,incb,a,inca);
}
else
{
rsb_nnz_idx_t wi, cnz = (wet+n-1)/wet; /* chunk size */
size_t es = RSB_SIZEOF(typecode);
#pragma omp parallel for schedule(static,1) RSB_NTC
for(wi=0;wi<wet;++wi)
{
rsb_nnz_idx_t coff = wi*cnz;
rsb_nnz_idx_t cnnz = (wi<wet-1)?cnz:n-((wet-1)*cnz);
rsb__cblas_Xaxpy(typecode,cnnz,alphap,((rsb_byte_t*)b)+es*coff*incb,incb,((rsb_byte_t*)a)+es*coff*inca,inca);
}
}
}
void rsb__cblas_Xscal_parallel(rsb_type_t typecode, size_t n, const void * alphap, void * a, size_t stride)
{
/**
\ingroup gr_internals
alphap can be NULL
a <- alpha * a
*/
const rsb_nnz_idx_t wet = rsb_get_num_threads(); /* want executing threads */
if(RSB_UNLIKELY(n<wet*RSB_MIN_THREAD_XAXPY_NNZ))/* at least RSB_MIN_THREAD_MEMCPY_NNZ nnz to trigger memcpy */
{
rsb__cblas_Xscal(typecode,n,alphap,a,stride);
}
else
{
rsb_nnz_idx_t wi,cnz = (wet+n-1)/wet; /* chunk size */
size_t es = RSB_SIZEOF(typecode);
#pragma omp parallel for schedule(static,1) RSB_NTC
for(wi=0;wi<wet;++wi)
{
rsb_nnz_idx_t coff = wi*cnz;
rsb_nnz_idx_t cnnz = (wi<wet-1)?cnz:n-((wet-1)*cnz);
rsb__cblas_Xscal(typecode,cnnz,alphap,((rsb_byte_t*)a)+es*coff*stride,stride);
}
}
}
/* @endcond */
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