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 2000-2007 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/_register_sparc.cpp.incl"
const int ConcreteRegisterImpl::max_gpr = RegisterImpl::number_of_registers << 1;
const int ConcreteRegisterImpl::max_fpr = ConcreteRegisterImpl::max_gpr + FloatRegisterImpl::number_of_registers;
const char* RegisterImpl::name() const {
const char* names[number_of_registers] = {
"G0", "G1", "G2", "G3", "G4", "G5", "G6", "G7",
"O0", "O1", "O2", "O3", "O4", "O5", "SP", "O7",
"L0", "L1", "L2", "L3", "L4", "L5", "L6", "L7",
"I0", "I1", "I2", "I3", "I4", "I5", "FP", "I7"
};
return is_valid() ? names[encoding()] : "noreg";
}
const char* FloatRegisterImpl::name() const {
const char* names[number_of_registers] = {
"F0", "F1", "F2", "F3", "F4", "F5", "F6", "F7", "F8", "F9",
"F10", "F11", "F12", "F13", "F14", "F15", "F16", "F17", "F18", "F19",
"F20", "F21", "F22", "F23", "F24", "F25", "F26", "F27", "F28", "F29",
"F30", "F31", "F32", "F33?", "F34", "F35?", "F36", "F37?", "F38", "F39?",
"F40", "F41?", "F42", "F43?", "F44", "F45?", "F46", "F47?", "F48", "F49?",
"F50", "F51?", "F52", "F53?", "F54", "F55?", "F56", "F57?", "F58", "F59?",
"F60", "F61?", "F62"
};
return is_valid() ? names[encoding()] : "fnoreg";
}