6800154: Add comments to long_by_long_mulhi() for better understandability
Summary: This patch adds a comment pointing to the Hacker's Delight version of the algorithm plus a verbatim copy of it. Furthermore it adds inline comments.
Reviewed-by: kvn, jrose
/*
* Copyright 2006-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
#include "incls/_precompiled.incl"
#include "incls/_vmreg_sparc.cpp.incl"
void VMRegImpl::set_regName() {
Register reg = ::as_Register(0);
int i;
for (i = 0; i < ConcreteRegisterImpl::max_gpr ; ) {
regName[i++ ] = reg->name();
regName[i++ ] = reg->name();
reg = reg->successor();
}
FloatRegister freg = ::as_FloatRegister(0);
for ( ; i < ConcreteRegisterImpl::max_fpr ; ) {
regName[i++] = freg->name();
if (freg->encoding() > 31) {
regName[i++] = freg->name();
}
freg = freg->successor();
}
for ( ; i < ConcreteRegisterImpl::number_of_registers ; i ++ ) {
regName[i] = "NON-GPR-FPR";
}
}