Mercurial > hg > graal-compiler
view graal/com.oracle.graal.truffle/src/com/oracle/graal/truffle/nodes/arithmetic/IntegerSubExactNode.java @ 17450:45b45f902bed
removed Node generation (GRAAL-857)
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 15 Oct 2014 15:35:33 +0200 |
parents | 75177b3cc5a8 |
children | 9619ba4daf4c |
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/* * Copyright (c) 2013, 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.truffle.nodes.arithmetic; 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.*; import com.oracle.graal.nodes.util.*; import com.oracle.truffle.api.*; /** * Node representing an exact integer substraction that will throw an {@link ArithmeticException} in * case the addition would overflow the 32 bit range. */ @NodeInfo public class IntegerSubExactNode extends SubNode implements IntegerExactArithmeticNode { public static IntegerSubExactNode create(ValueNode x, ValueNode y) { return new IntegerSubExactNode(x, y); } protected IntegerSubExactNode(ValueNode x, ValueNode y) { super(x, y); assert x.stamp().isCompatible(y.stamp()) && x.stamp() instanceof IntegerStamp; } @Override public boolean inferStamp() { // TODO Should probably use a specialized version which understands that it can't overflow return super.inferStamp(); } @Override public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) { if (GraphUtil.unproxify(forX) == GraphUtil.unproxify(forY)) { return ConstantNode.forIntegerStamp(stamp(), 0); } if (forX.isConstant() && forY.isConstant()) { return canonicalXYconstant(forX, forY); } else if (forY.isConstant()) { long c = forY.asConstant().asLong(); if (c == 0) { return forX; } } return this; } private ValueNode canonicalXYconstant(ValueNode forX, ValueNode forY) { Constant xConst = forX.asConstant(); Constant yConst = forY.asConstant(); assert xConst.getKind() == yConst.getKind(); try { if (xConst.getKind() == Kind.Int) { return ConstantNode.forInt(ExactMath.subtractExact(xConst.asInt(), yConst.asInt())); } else { assert xConst.getKind() == Kind.Long; return ConstantNode.forLong(ExactMath.subtractExact(xConst.asLong(), yConst.asLong())); } } catch (ArithmeticException ex) { // The operation will result in an overflow exception, so do not canonicalize. } return this; } @Override public IntegerExactArithmeticSplitNode createSplit(BeginNode next, BeginNode deopt) { return graph().add(IntegerSubExactSplitNode.create(stamp(), getX(), getY(), next, deopt)); } @Override public void lower(LoweringTool tool) { IntegerExactArithmeticSplitNode.lower(tool, this); } @NodeIntrinsic public static int subtractExact(int a, int b) { return ExactMath.subtractExact(a, b); } @NodeIntrinsic public static long subtractExact(long a, long b) { return ExactMath.subtractExact(a, b); } }