Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/IntegerAddNode.java @ 11851:04b039d82e86
Simplify constant folding.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Wed, 02 Oct 2013 12:09:51 +0200 |
parents | 2ad1435489d1 |
children | 673f93db4adc |
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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.meta.*; import com.oracle.graal.graph.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; @NodeInfo(shortName = "+") public class IntegerAddNode extends IntegerArithmeticNode implements Canonicalizable { public IntegerAddNode(Kind kind, ValueNode x, ValueNode y) { super(kind, x, y); } @Override public boolean inferStamp() { return updateStamp(StampTool.add(x().stamp(), y().stamp())); } @Override public Constant evalConst(Constant... inputs) { assert inputs.length == 2; return Constant.forIntegerKind(kind(), inputs[0].asLong() + inputs[1].asLong(), null); } @Override public ValueNode canonical(CanonicalizerTool tool) { if (x().isConstant() && !y().isConstant()) { return graph().unique(new IntegerAddNode(kind(), y(), x())); } if (x() instanceof IntegerSubNode) { IntegerSubNode sub = (IntegerSubNode) x(); if (sub.y() == y()) { // (a - b) + b return sub.x(); } } if (y() instanceof IntegerSubNode) { IntegerSubNode sub = (IntegerSubNode) y(); if (sub.y() == x()) { // b + (a - b) return sub.x(); } } if (x().isConstant()) { return ConstantNode.forPrimitive(evalConst(x().asConstant(), y().asConstant()), graph()); } else if (y().isConstant()) { long c = y().asConstant().asLong(); if (c == 0) { return x(); } // canonicalize expressions like "(a + 1) + 2" BinaryNode reassociated = BinaryNode.reassociate(this, ValueNode.isConstantPredicate()); if (reassociated != this) { return reassociated; } if (c < 0) { if (kind() == Kind.Int) { return IntegerArithmeticNode.sub(x(), ConstantNode.forInt((int) -c, graph())); } else { assert kind() == Kind.Long; return IntegerArithmeticNode.sub(x(), ConstantNode.forLong(-c, graph())); } } } if (x() instanceof NegateNode) { return IntegerArithmeticNode.sub(y(), ((NegateNode) x()).x()); } else if (y() instanceof NegateNode) { return IntegerArithmeticNode.sub(x(), ((NegateNode) y()).x()); } return this; } public static boolean isIntegerAddition(ValueNode result, ValueNode a, ValueNode b) { Kind kind = result.kind(); if (kind != a.kind() || kind != b.kind() || !(kind.getStackKind() == Kind.Int || kind == Kind.Long)) { return false; } if (result.isConstant() && a.isConstant() && b.isConstant()) { if (kind.getStackKind() == Kind.Int) { return result.asConstant().asInt() == a.asConstant().asInt() + b.asConstant().asInt(); } else if (kind == Kind.Long) { return result.asConstant().asLong() == a.asConstant().asLong() + b.asConstant().asLong(); } } else if (result instanceof IntegerAddNode) { IntegerAddNode add = (IntegerAddNode) result; return (add.x() == a && add.y() == b) || (add.y() == a && add.x() == b); } return false; } @Override public void generate(ArithmeticLIRGenerator gen) { Value op1 = gen.operand(x()); assert op1 != null : x() + ", this=" + this; Value op2 = gen.operand(y()); if (!y().isConstant() && !FloatAddNode.livesLonger(this, y(), gen)) { Value op = op1; op1 = op2; op2 = op; } gen.setResult(this, gen.emitAdd(op1, op2)); } }