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README_half_prec_20180720
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//****************************************************************************************
//
// Copyright (c) 2015-2020, Yoshifumi Nakamura <nakamura@riken.jp>
// Copyright (c) 2015-2020, Yuta Mukai <mukai.yuta@fujitsu.com>
// Copyright (c) 2018-2020, Ken-Ichi Ishikawa <ishikawa@theo.phys.sci.hirosima-u.ac.jp>
// Copyright (c) 2019-2020, Issaku Kanamori <kanamori-i@riken.jp>
//
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer listed
// in this license in the documentation and/or other materials
// provided with the distribution.
//
// * Neither the name of the copyright holders nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
//----------------------------------------------------------------------------------------
// ACKNOWLEDGMENT
//
// This software has been developed in a co-design working group for the lattice QCD
// supported by MEXT's programs for the Development and Improvement for the Next
// Generation Ultra High-Speed Computer System, under its Subsidies for Operating the
// Specific Advanced Large Research Facilities, and Priority Issue 9
// (Elucidation of the Fundamental Laws and Evolution of the Universe) to be tackled by
// using the Supercomputer Fugaku.
//
//****************************************************************************************
Half-precision SAP preconditioner is implemented in "qws_h.cc".
Public functions are listed in the header file "qws_h.h".
//////////////////
void assign_mult_mSAP_s_h_(scs_t *xs, const scs_t *bs, const int *nsap, const int *nm);
is the SAP preconditioner. single-precision data are converted to half-precision in this routine and
preconditioned in half-precision, then the preconditioned data are converted to single-precision.
//////////////////
void assign_mult_wd_s_(scs_t *x, const scs_t *b);
is the Wilson/Clover-Dirac operator in single-precision.
//////////////////
void qws_h_init_(const glus_t *glus, const clvs_t *clvs);
is the initialization routine to set guauge and clover fields, and communicataion MPI buffers.
Half-precision arithmetic is emulated by using
IEEE-754-based half-precision floating point library (half-1.12.0)
from http://half.sourceforge.net/
2018/07/20 Ken-Ichi Ishikawa for APL9WG