Mercurial > hg > graal-jvmci-8
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/CompareNode.java @ 15912:c44f617fb8d7
Optimize compare compressed pattern.
author | Roland Schatz <roland.schatz@oracle.com> |
---|---|
date | Mon, 26 May 2014 17:43:45 +0200 |
parents | 1f4d56a1fdef |
children | d5b824a41530 |
line wrap: on
line source
/* * Copyright (c) 2011, 2011, 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.nodes.calc; import com.oracle.graal.api.meta.*; import com.oracle.graal.api.meta.ProfilingInfo.TriState; import com.oracle.graal.compiler.common.*; import com.oracle.graal.compiler.common.calc.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodes.*; /* TODO (thomaswue/gdub) For high-level optimization purpose the compare node should be a boolean *value* (it is currently only a helper node) * But in the back-end the comparison should not always be materialized (for example in x86 the comparison result will not be in a register but in a flag) * * Compare should probably be made a value (so that it can be canonicalized for example) and in later stages some Compare usage should be transformed * into variants that do not materialize the value (CompareIf, CompareGuard...) */ public abstract class CompareNode extends BinaryOpLogicNode { /** * Constructs a new Compare instruction. * * @param x the instruction producing the first input to the instruction * @param y the instruction that produces the second input to this instruction */ public CompareNode(ValueNode x, ValueNode y) { super(x, y); } /** * Gets the condition (comparison operation) for this instruction. * * @return the condition */ public abstract Condition condition(); /** * Checks whether unordered inputs mean true or false (only applies to float operations). * * @return {@code true} if unordered inputs produce true */ public abstract boolean unorderedIsTrue(); private LogicNode optimizeConditional(Constant constant, ConditionalNode conditionalNode, ConstantReflectionProvider constantReflection, Condition cond) { Constant trueConstant = conditionalNode.trueValue().asConstant(); Constant falseConstant = conditionalNode.falseValue().asConstant(); if (falseConstant != null && trueConstant != null && constantReflection != null) { boolean trueResult = cond.foldCondition(trueConstant, constant, constantReflection, unorderedIsTrue()); boolean falseResult = cond.foldCondition(falseConstant, constant, constantReflection, unorderedIsTrue()); if (trueResult == falseResult) { return LogicConstantNode.forBoolean(trueResult, graph()); } else { if (trueResult) { assert falseResult == false; return conditionalNode.condition(); } else { assert falseResult == true; return graph().unique(new LogicNegationNode(conditionalNode.condition())); } } } return this; } protected LogicNode optimizeNormalizeCmp(Constant constant, NormalizeCompareNode normalizeNode, boolean mirrored) { throw new GraalInternalError("NormalizeCompareNode connected to %s (%s %s %s)", this, constant, normalizeNode, mirrored); } @Override public TriState evaluate(ConstantReflectionProvider constantReflection, ValueNode forX, ValueNode forY) { if (forX.isConstant() && forY.isConstant()) { return TriState.get(condition().foldCondition(forX.asConstant(), forY.asConstant(), constantReflection, unorderedIsTrue())); } return TriState.UNKNOWN; } @Override public Node canonical(CanonicalizerTool tool) { Node result = super.canonical(tool); if (result != this) { return result; } if (x().isConstant()) { if (y() instanceof ConditionalNode) { return optimizeConditional(x().asConstant(), (ConditionalNode) y(), tool.getConstantReflection(), condition().mirror()); } else if (y() instanceof NormalizeCompareNode) { return optimizeNormalizeCmp(x().asConstant(), (NormalizeCompareNode) y(), true); } } else if (y().isConstant()) { if (x() instanceof ConditionalNode) { return optimizeConditional(y().asConstant(), (ConditionalNode) x(), tool.getConstantReflection(), condition()); } else if (x() instanceof NormalizeCompareNode) { return optimizeNormalizeCmp(y().asConstant(), (NormalizeCompareNode) x(), false); } } if (x() instanceof ConvertNode && y() instanceof ConvertNode) { ConvertNode convertX = (ConvertNode) x(); ConvertNode convertY = (ConvertNode) y(); if (convertX.preservesOrder(condition()) && convertY.preservesOrder(condition()) && convertX.getInput().stamp().isCompatible(convertY.getInput().stamp())) { setX(convertX.getInput()); setY(convertY.getInput()); } } else if (x() instanceof ConvertNode && y().isConstant()) { ConvertNode convertX = (ConvertNode) x(); ConstantNode newY = canonicalConvertConstant(tool, convertX, y().asConstant()); if (newY != null) { setX(convertX.getInput()); setY(newY); } } else if (y() instanceof ConvertNode && x().isConstant()) { ConvertNode convertY = (ConvertNode) y(); ConstantNode newX = canonicalConvertConstant(tool, convertY, x().asConstant()); if (newX != null) { setX(newX); setY(convertY.getInput()); } } return this; } private ConstantNode canonicalConvertConstant(CanonicalizerTool tool, ConvertNode convert, Constant constant) { if (convert.preservesOrder(condition())) { Constant reverseConverted = convert.reverse(constant); if (convert.convert(reverseConverted).equals(constant)) { return ConstantNode.forConstant(convert.getInput().stamp(), reverseConverted, tool.getMetaAccess(), convert.graph()); } } return null; } public static CompareNode createCompareNode(StructuredGraph graph, Condition condition, ValueNode x, ValueNode y) { assert x.getKind() == y.getKind(); assert condition.isCanonical() : "condition is not canonical: " + condition; assert !x.getKind().isNumericFloat(); CompareNode comparison; if (condition == Condition.EQ) { if (x.getKind() == Kind.Object) { comparison = new ObjectEqualsNode(x, y); } else { assert x.getKind().isNumericInteger(); comparison = new IntegerEqualsNode(x, y); } } else if (condition == Condition.LT) { assert x.getKind().isNumericInteger(); comparison = new IntegerLessThanNode(x, y); } else { assert condition == Condition.BT; assert x.getKind().isNumericInteger(); comparison = new IntegerBelowThanNode(x, y); } return graph.unique(comparison); } }