Mercurial > hg > truffle
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> |
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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); } }