Mercurial > hg > truffle
view graal/com.oracle.graal.compiler.amd64/src/com/oracle/graal/compiler/amd64/AMD64AddressLowering.java @ 21784:f4e1d958f1c3
[AMD64] Create AMD64 specific address nodes.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Mon, 08 Jun 2015 19:19:45 +0200 |
parents | |
children | 2766fee1809a |
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/* * Copyright (c) 2015, 2015, 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.compiler.amd64; import com.oracle.graal.asm.*; import com.oracle.graal.asm.amd64.AMD64Address.Scale; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.memory.address.*; import com.oracle.graal.phases.common.AddressLoweringPhase.AddressLowering; import com.oracle.jvmci.code.*; import com.oracle.jvmci.meta.*; public class AMD64AddressLowering extends AddressLowering { private final CodeCacheProvider codeCache; public AMD64AddressLowering(CodeCacheProvider codeCache) { this.codeCache = codeCache; } @Override public AddressNode lower(ValueNode address) { return lower(address, null); } @Override public AddressNode lower(ValueNode base, ValueNode offset) { AMD64AddressNode ret = new AMD64AddressNode(base, offset); boolean changed; do { changed = improve(ret); } while (changed); return base.graph().unique(ret); } protected boolean improve(AMD64AddressNode ret) { ValueNode newBase = improveConstDisp(ret, ret.getBase(), 0); if (newBase != ret.getBase()) { ret.setBase(newBase); return true; } ValueNode newIdx = improveConstDisp(ret, ret.getIndex(), ret.getScale().log2); if (newIdx != ret.getIndex()) { ret.setIndex(newIdx); return true; } if (ret.getIndex() instanceof LeftShiftNode) { LeftShiftNode shift = (LeftShiftNode) ret.getIndex(); if (shift.getY().isConstant()) { int amount = ret.getScale().log2 + shift.getY().asJavaConstant().asInt(); Scale scale = Scale.fromShift(amount); if (scale != null) { ret.setIndex(shift.getX()); ret.setScale(scale); return true; } } } if (ret.getScale() == Scale.Times1) { if (ret.getBase() == null || ret.getIndex() == null) { if (ret.getBase() instanceof AddNode) { AddNode add = (AddNode) ret.getBase(); ret.setBase(add.getX()); ret.setIndex(add.getY()); return true; } else if (ret.getIndex() instanceof AddNode) { AddNode add = (AddNode) ret.getIndex(); ret.setBase(add.getX()); ret.setIndex(add.getY()); return true; } } if (ret.getBase() instanceof LeftShiftNode && !(ret.getIndex() instanceof LeftShiftNode)) { ValueNode tmp = ret.getBase(); ret.setBase(ret.getIndex()); ret.setIndex(tmp); return true; } } return false; } private ValueNode improveConstDisp(AMD64AddressNode address, ValueNode node, int shift) { if (node == null) { return null; } if (node.isConstant()) { return improveConstDisp(address, node, node.asJavaConstant(), null, shift); } else if (node instanceof AddNode) { AddNode add = (AddNode) node; if (add.getX().isConstant()) { return improveConstDisp(address, node, add.getX().asJavaConstant(), add.getY(), shift); } else if (add.getY().isConstant()) { return improveConstDisp(address, node, add.getY().asJavaConstant(), add.getX(), shift); } } return node; } private ValueNode improveConstDisp(AMD64AddressNode address, ValueNode original, JavaConstant c, ValueNode other, int shift) { if (c.getKind().isNumericInteger() && !codeCache.needsDataPatch(c)) { long disp = address.getDisplacement(); disp += c.asLong() << shift; if (NumUtil.isInt(disp)) { address.setDisplacement((int) disp); return other; } } return original; } }