Mercurial > hg > truffle
view graal/com.oracle.graal.loop/src/com/oracle/graal/loop/BasicInductionVariable.java @ 9431:c0488f573091
Make AMD64 LIR generator extensible.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Tue, 30 Apr 2013 19:16:25 +0200 |
parents | 5e3d1a68664e |
children | 27733a62ba72 |
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/* * Copyright (c) 2012, 2012, 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.loop; import com.oracle.graal.graph.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.type.*; public class BasicInductionVariable extends InductionVariable { private PhiNode phi; private ValueNode init; private ValueNode rawStride; private IntegerArithmeticNode op; public BasicInductionVariable(LoopEx loop, PhiNode phi, ValueNode init, ValueNode rawStride, IntegerArithmeticNode op) { super(loop); this.phi = phi; this.init = init; this.rawStride = rawStride; this.op = op; } @Override public Direction direction() { Stamp stamp = rawStride.stamp(); if (stamp instanceof IntegerStamp) { IntegerStamp integerStamp = (IntegerStamp) stamp; Direction dir = null; if (integerStamp.isStrictlyPositive()) { dir = Direction.Up; } else if (integerStamp.isStrictlyNegative()) { dir = Direction.Down; } if (dir != null) { if (op instanceof IntegerAddNode) { return dir; } else { assert op instanceof IntegerSubNode; return dir.opposite(); } } } return null; } @Override public PhiNode valueNode() { return phi; } @Override public ValueNode initNode() { return init; } @Override public ValueNode strideNode() { if (op instanceof IntegerAddNode) { return rawStride; } if (op instanceof IntegerSubNode) { return rawStride.graph().unique(new NegateNode(rawStride)); } throw GraalInternalError.shouldNotReachHere(); } @Override public boolean isConstantInit() { return init.isConstant(); } @Override public boolean isConstantStride() { return rawStride.isConstant(); } @Override public long constantInit() { return init.asConstant().asLong(); } @Override public long constantStride() { if (op instanceof IntegerAddNode) { return rawStride.asConstant().asLong(); } if (op instanceof IntegerSubNode) { return -rawStride.asConstant().asLong(); } throw GraalInternalError.shouldNotReachHere(); } @Override public ValueNode extremumNode() { return IntegerArithmeticNode.add(IntegerArithmeticNode.mul(strideNode(), loop.counted().maxTripCountNode()), init); } @Override public boolean isConstantExtremum() { return isConstantInit() && isConstantStride() && loop.counted().isConstantMaxTripCount(); } @Override public long constantExtremum() { return constantStride() * loop.counted().constantMaxTripCount() + constantInit(); } }