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 1997-2004 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/_icache_sparc.cpp.incl"
#define __ _masm->
void ICacheStubGenerator::generate_icache_flush(
ICache::flush_icache_stub_t* flush_icache_stub
) {
StubCodeMark mark(this, "ICache", "flush_icache_stub");
address start = __ pc();
Label L;
__ bind(L);
__ flush( O0, G0 );
__ deccc( O1 );
__ br(Assembler::positive, false, Assembler::pn, L);
__ delayed()->inc( O0, 8 );
__ retl(false);
__ delayed()->mov( O2, O0 ); // handshake with caller to make sure it happened!
// Must be set here so StubCodeMark destructor can call the flush stub.
*flush_icache_stub = (ICache::flush_icache_stub_t)start;
};
#undef __