Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/CompareNode.java @ 5681:7482f7d08455
Don't try to fold conditions when there is no runtime available
Provide a runtime when doing full unrolling
author | Gilles Duboscq <duboscq@ssw.jku.at> |
---|---|
date | Fri, 22 Jun 2012 11:35:55 +0200 |
parents | 3570883de730 |
children | 12e5956a8fdd |
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/* * 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.code.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.graph.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /* 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 BooleanNode implements Canonicalizable, LIRLowerable { @Input private ValueNode x; @Input private ValueNode y; public ValueNode x() { return x; } public ValueNode y() { return y; } /** * 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(StampFactory.condition()); assert (x == null && y == null) || x.kind() == y.kind(); this.x = x; this.y = 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(); @Override public void generate(LIRGeneratorTool gen) { } private ValueNode optimizeConditional(Constant constant, ConditionalNode conditionalNode, CodeCacheProvider runtime, Condition cond) { Constant trueConstant = conditionalNode.trueValue().asConstant(); Constant falseConstant = conditionalNode.falseValue().asConstant(); if (falseConstant != null && trueConstant != null && runtime != null) { Boolean trueResult = cond.foldCondition(trueConstant, constant, runtime, unorderedIsTrue()); Boolean falseResult = cond.foldCondition(falseConstant, constant, runtime, unorderedIsTrue()); if (trueResult != null && falseResult != null) { boolean trueUnboxedResult = trueResult; boolean falseUnboxedResult = falseResult; if (trueUnboxedResult == falseUnboxedResult) { return ConstantNode.forBoolean(trueUnboxedResult, graph()); } else { if (trueUnboxedResult) { assert falseUnboxedResult == false; return conditionalNode.condition(); } else { assert falseUnboxedResult == true; negateUsages(); return conditionalNode.condition(); } } } } return this; } protected ValueNode optimizeNormalizeCmp(Constant constant, NormalizeCompareNode normalizeNode, boolean mirrored) { throw new GraalInternalError("NormalizeCompareNode connected to %s (%s %s %s)", this, constant, normalizeNode, mirrored); } public ValueNode canonical(CanonicalizerTool tool) { if (x().isConstant() && y().isConstant() && tool.runtime() != null) { return ConstantNode.forBoolean(condition().foldCondition(x().asConstant(), y().asConstant(), tool.runtime(), unorderedIsTrue()), graph()); } if (x().isConstant()) { if (y() instanceof ConditionalNode) { return optimizeConditional(x().asConstant(), (ConditionalNode) y(), tool.runtime(), 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.runtime(), condition()); } else if (x() instanceof NormalizeCompareNode) { return optimizeNormalizeCmp(y().asConstant(), (NormalizeCompareNode) x(), false); } } return this; } }