Mercurial > hg > truffle
view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/CRC32Substitutions.java @ 12431:7080a96be216
rename: graalRuntime -> runtime, getGraalRuntime -> getRuntime
author | Doug Simon <doug.simon@oracle.com> |
---|---|
date | Tue, 15 Oct 2013 22:21:01 +0200 |
parents | 5420b872e728 |
children | 5348da19751d |
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/* * Copyright (c) 2012, 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 static com.oracle.graal.hotspot.HotSpotGraalRuntime.*; import static com.oracle.graal.hotspot.replacements.HotSpotReplacementsUtil.*; import java.util.zip.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.api.replacements.*; import com.oracle.graal.graph.Node.*; import com.oracle.graal.hotspot.nodes.*; import com.oracle.graal.nodes.extended.*; import com.oracle.graal.replacements.Snippet.Fold; import com.oracle.graal.word.*; /** * Substitutions for {@link CRC32}. */ @ClassSubstitution(value = CRC32.class) public class CRC32Substitutions { /** * Gets the address of {@code StubRoutines::x86::_crc_table} in {@code stubRoutines_x86.hpp}. */ @Fold private static long crcTableAddress() { return runtime().getConfig().crcTableAddress; } @MethodSubstitution(isStatic = true) static int update(int crc, int b) { int c = ~crc; int index = (b ^ c) & 0xFF; int offset = index << 2; int result = Word.unsigned(crcTableAddress()).readInt(offset); result = result ^ (c >>> 8); return ~result; } @MethodSubstitution(isStatic = true) static int updateBytes(int crc, byte[] buf, int off, int len) { Word bufAddr = Word.unsigned(GetObjectAddressNode.get(buf) + arrayBaseOffset(Kind.Byte) + off); return updateBytes(UPDATE_BYTES_CRC32, crc, bufAddr, len); } @MethodSubstitution(isStatic = true, optional = true) static int updateByteBuffer(int crc, long addr, int off, int len) { Word bufAddr = Word.unsigned(addr).add(off); return updateBytes(UPDATE_BYTES_CRC32, crc, bufAddr, len); } public static final ForeignCallDescriptor UPDATE_BYTES_CRC32 = new ForeignCallDescriptor("updateBytesCRC32", int.class, int.class, Word.class, int.class); @NodeIntrinsic(ForeignCallNode.class) public static native int updateBytes(@ConstantNodeParameter ForeignCallDescriptor descriptor, int crc, Word buf, int length); }