Mercurial > hg > truffle
view graal/com.oracle.max.graal.nodes/src/com/oracle/max/graal/nodes/calc/RightShiftNode.java @ 4199:aaac4894175c
Renamed cri packages from sun to oracle.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
---|---|
date | Tue, 03 Jan 2012 16:29:28 +0100 |
parents | e233f5660da4 |
children | 4a609a685fa4 |
line wrap: on
line source
/* * 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.max.graal.nodes.calc; import com.oracle.max.cri.ci.*; import com.oracle.max.graal.graph.*; import com.oracle.max.graal.nodes.*; import com.oracle.max.graal.nodes.spi.*; @NodeInfo(shortName = ">>") public final class RightShiftNode extends ShiftNode implements Canonicalizable, LIRLowerable { public RightShiftNode(CiKind kind, ValueNode x, ValueNode y) { super(kind, x, y); } @Override public Node canonical(CanonicalizerTool tool) { if (y().isConstant()) { int amount = y().asConstant().asInt(); int originalAmout = amount; int mask; if (kind() == CiKind.Int) { mask = 0x1f; } else { assert kind() == CiKind.Long; mask = 0x3f; } amount &= mask; if (x().isConstant()) { if (kind() == CiKind.Int) { return ConstantNode.forInt(x().asConstant().asInt() >> amount, graph()); } else { assert kind() == CiKind.Long; return ConstantNode.forLong(x().asConstant().asLong() >> amount, graph()); } } if (amount == 0) { return x(); } if (x() instanceof ShiftNode) { ShiftNode other = (ShiftNode) x(); if (other.y().isConstant()) { int otherAmount = other.y().asConstant().asInt() & mask; if (other instanceof RightShiftNode) { int total = amount + otherAmount; if (total != (total & mask)) { return ConstantNode.forInt(0, graph()); } return graph().unique(new RightShiftNode(kind(), other.x(), ConstantNode.forInt(total, graph()))); } } } if (originalAmout != amount) { return graph().unique(new RightShiftNode(kind(), x(), ConstantNode.forInt(amount, graph()))); } } return this; } @Override public void generate(LIRGeneratorTool gen) { gen.setResult(this, gen.emitShr(gen.operand(x()), gen.operand(y()))); } }