view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/LongSubstitutions.java @ 18415:6dc4f0be9a70

Add support of lzcnt and tzcnt - support of lzcnt and tzcnt instructions, - unit tests for lzcnt/tzcnt, - ability to emit bsf/bsr in case lzcnt/tzcnt were turned off from the command line, - tightening the stamps produced by ScanBitForward/ReverseNode nodes. Contributed-By: Igor Veresov <igor.veresov@oracle.com>
author Gilles Duboscq <duboscq@ssw.jku.at>
date Wed, 19 Nov 2014 13:32:05 +0100
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/*
 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.oracle.graal.hotspot.replacements;

import com.oracle.graal.api.replacements.*;

@ClassSubstitution(Long.class)
public class LongSubstitutions {

    @MethodSubstitution(guard = HotspotGuards.CountLeadingZerosSupported.class)
    public static int numberOfLeadingZeros(long i) {
        return CountLeadingZerosNode.count(i);
    }

    @MethodSubstitution(guard = HotspotGuards.CountTrailingZerosSupported.class)
    public static int numberOfTrailingZeros(long i) {
        return CountTrailingZerosNode.count(i);
    }
}