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 1998-2005 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.
*
*/
static int binary_search(int key, LookupswitchPair* array, int n);
static address iload (JavaThread* thread);
static address aload (JavaThread* thread);
static address istore(JavaThread* thread);
static address astore(JavaThread* thread);
static address iinc (JavaThread* thread);
// native method calls
class SignatureHandlerGenerator: public NativeSignatureIterator {
private:
MacroAssembler* _masm;
void pass_word(int size_of_arg, int offset_in_arg);
void pass_int() { pass_word(1, 0); }
void pass_long();
void pass_double();
void pass_float();
void pass_object();
public:
// Creation
SignatureHandlerGenerator(methodHandle method, CodeBuffer* buffer) : NativeSignatureIterator(method) {
_masm = new MacroAssembler(buffer);
}
// Code generation
void generate( uint64_t fingerprint );
};