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view graal/com.oracle.graal.replacements.amd64/src/com/oracle/graal/replacements/amd64/AMD64CountTrailingZerosNode.java @ 18495:fe0db662e982
adds ability for substitution guards to have a constructor with an Architecture argument
added extra flags enum to AMD64 to drive code emission features (currently contains UseCountLeadingZerosInstruction and UseCountTrailingZerosInstruction)
moved lzcnt/tzcnt nodes and substitutions to com.oracle.graal.replacements.amd64
Contributed-by: Igor Veresov <igor.veresov@oracle.com>
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 24 Nov 2014 20:32:24 +0100 |
parents | graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/CountTrailingZerosNode.java@6dc4f0be9a70 |
children | f57d86eb036f |
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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.replacements.amd64; import com.oracle.graal.api.code.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.compiler.common.type.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodeinfo.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.spi.*; /** * Count the number of trailing zeros. */ @NodeInfo public class AMD64CountTrailingZerosNode extends UnaryNode implements LIRLowerable { public static AMD64CountTrailingZerosNode create(ValueNode value) { return new AMD64CountTrailingZerosNode(value); } protected AMD64CountTrailingZerosNode(ValueNode value) { super(StampFactory.forInteger(Kind.Int, 0, ((PrimitiveStamp) value.stamp()).getBits()), value); assert value.getKind() == Kind.Int || value.getKind() == Kind.Long; } @Override public boolean inferStamp() { IntegerStamp valueStamp = (IntegerStamp) getValue().stamp(); long mask = CodeUtil.mask(valueStamp.getBits()); int min = Long.numberOfTrailingZeros(valueStamp.upMask() & mask); int max = Long.numberOfTrailingZeros(valueStamp.downMask() & mask); return updateStamp(StampFactory.forInteger(Kind.Int, min, max)); } @Override public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) { if (forValue.isConstant()) { JavaConstant c = forValue.asJavaConstant(); if (forValue.getKind() == Kind.Int) { return ConstantNode.forInt(Integer.numberOfTrailingZeros(c.asInt())); } else { return ConstantNode.forInt(Long.numberOfTrailingZeros(c.asLong())); } } return this; } /** * Raw intrinsic for tzcntq instruction. * * @param v * @return number of trailing zeros */ @NodeIntrinsic public static native int count(long v); /** * Raw intrinsic for tzcntl instruction. * * @param v * @return number of trailing zeros */ @NodeIntrinsic public static native int count(int v); @Override public void generate(NodeLIRBuilderTool gen) { Value result = gen.getLIRGeneratorTool().emitCountTrailingZeros(gen.operand(getValue())); gen.setResult(this, result); } }