Mercurial > hg > graal-jvmci-8
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/IntegerRemNode.java @ 6299:1ed726759f65
Add helper methods to IntegerStamp for sign, use them
Fix a comment in IntegerDiv canonicalization
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Tue, 28 Aug 2012 14:04:55 +0200 |
parents | d71eb56d6bb0 |
children | cd205ca515dd |
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/* * Copyright (c) 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.*; @NodeInfo(shortName = "%") public final class IntegerRemNode extends IntegerArithmeticNode implements Canonicalizable, LIRLowerable { public IntegerRemNode(Kind kind, ValueNode x, ValueNode y) { super(kind, x, y); } @Override public ValueNode canonical(CanonicalizerTool tool) { if (x().isConstant() && y().isConstant()) { long yConst = y().asConstant().asLong(); if (yConst == 0) { return this; // this will trap, can not canonicalize } if (kind() == Kind.Int) { return ConstantNode.forInt(x().asConstant().asInt() % (int) yConst, graph()); } else { assert kind() == Kind.Long; return ConstantNode.forLong(x().asConstant().asLong() % yConst, graph()); } } else if (y().isConstant()) { long c = y().asConstant().asLong(); if (c == 1 || c == -1) { return ConstantNode.forIntegerKind(kind(), 0, graph()); } else if (c > 0 && CodeUtil.isPowerOf2(c) && x().integerStamp().isPositive()) { return graph().unique(new AndNode(kind(), x(), ConstantNode.forIntegerKind(kind(), c - 1, graph()))); } } return this; } @Override public void generate(LIRGeneratorTool gen) { gen.setResult(this, gen.emitRem(gen.operand(x()), gen.operand(y()))); } }