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
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*/
//
// Sets the default values for platform dependent flags used by the client compiler.
// (see c1_globals.hpp)
//
#ifndef TIERED
define_pd_global(bool, BackgroundCompilation, true );
define_pd_global(bool, CICompileOSR, true );
define_pd_global(bool, InlineIntrinsics, true );
define_pd_global(bool, PreferInterpreterNativeStubs, false);
define_pd_global(bool, ProfileTraps, false);
define_pd_global(bool, UseOnStackReplacement, true );
define_pd_global(bool, TieredCompilation, false);
define_pd_global(intx, CompileThreshold, 1000 ); // Design center runs on 1.3.1
define_pd_global(intx, Tier2CompileThreshold, 1500 );
define_pd_global(intx, Tier3CompileThreshold, 2000 );
define_pd_global(intx, Tier4CompileThreshold, 2500 );
define_pd_global(intx, BackEdgeThreshold, 100000);
define_pd_global(intx, Tier2BackEdgeThreshold, 100000);
define_pd_global(intx, Tier3BackEdgeThreshold, 100000);
define_pd_global(intx, Tier4BackEdgeThreshold, 100000);
define_pd_global(intx, OnStackReplacePercentage, 1400 );
define_pd_global(bool, UseTLAB, true );
define_pd_global(bool, ProfileInterpreter, false);
define_pd_global(intx, FreqInlineSize, 325 );
define_pd_global(intx, NewRatio, 8 ); // Design center runs on 1.3.1
define_pd_global(bool, ResizeTLAB, true );
define_pd_global(intx, ReservedCodeCacheSize, 32*M );
define_pd_global(intx, CodeCacheExpansionSize, 32*K );
define_pd_global(uintx,CodeCacheMinBlockLength, 1);
define_pd_global(uintx, PermSize, 12*M );
define_pd_global(uintx, MaxPermSize, 64*M );
define_pd_global(bool, NeverActAsServerClassMachine, true);
define_pd_global(intx, NewSizeThreadIncrease, 16*K );
define_pd_global(uintx, DefaultMaxRAM, 1*G);
define_pd_global(intx, InitialCodeCacheSize, 160*K);
#endif // TIERED
define_pd_global(bool, UseTypeProfile, false);
define_pd_global(bool, RoundFPResults, false);
define_pd_global(bool, LIRFillDelaySlots, true);
define_pd_global(bool, OptimizeSinglePrecision, false);
define_pd_global(bool, CSEArrayLength, true);
define_pd_global(bool, TwoOperandLIRForm, false);
define_pd_global(intx, SafepointPollOffset, 0);