Mercurial > hg > graal-compiler
view graal/com.oracle.max.cri/src/com/oracle/max/cri/ri/RiRegisterAttributes.java @ 4211:bf6d8bcde8a0
Do not emit stack-to-stack moves.
author | Christian Wimmer <Christian.Wimmer@Oracle.com> |
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date | Tue, 03 Jan 2012 18:41:01 -0800 |
parents | aaac4894175c |
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/* * Copyright (c) 2010, 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.cri.ri; import java.util.*; import com.oracle.max.cri.ci.*; /** * A collection of register attributes. The specific attribute values for a register may be * local to a compilation context. For example, a {@link RiRegisterConfig} in use during * a compilation will determine which registers are callee saved. */ public class RiRegisterAttributes { /** * Denotes a register whose value preservation (if required) across a call is the responsibility of the caller. */ public final boolean isCallerSave; /** * Denotes a register whose value preservation (if required) across a call is the responsibility of the callee. */ public final boolean isCalleeSave; /** * Denotes a register that is available for use by a register allocator. */ public final boolean isAllocatable; /** * Denotes a register guaranteed to be non-zero if read in compiled Java code. * For example, a register dedicated to holding the current thread. */ public boolean isNonZero; public RiRegisterAttributes(boolean isCallerSave, boolean isCalleeSave, boolean isAllocatable) { this.isCallerSave = isCallerSave; this.isCalleeSave = isCalleeSave; this.isAllocatable = isAllocatable; } public static final RiRegisterAttributes NONE = new RiRegisterAttributes(false, false, false); /** * Creates a map from register {@linkplain CiRegister#number numbers} to register * {@linkplain RiRegisterAttributes attributes} for a given register configuration and set of * registers. * * @param registerConfig a register configuration * @param registers a set of registers * @return an array whose length is the max register number in {@code registers} plus 1. An element at index i holds * the attributes of the register whose number is i. */ public static RiRegisterAttributes[] createMap(RiRegisterConfig registerConfig, CiRegister[] registers) { RiRegisterAttributes[] map = new RiRegisterAttributes[registers.length]; for (CiRegister reg : registers) { if (reg != null) { CiCalleeSaveLayout csl = registerConfig.getCalleeSaveLayout(); RiRegisterAttributes attr = new RiRegisterAttributes( Arrays.asList(registerConfig.getCallerSaveRegisters()).contains(reg), csl == null ? false : Arrays.asList(csl.registers).contains(reg), Arrays.asList(registerConfig.getAllocatableRegisters()).contains(reg)); if (map.length <= reg.number) { map = Arrays.copyOf(map, reg.number + 1); } map[reg.number] = attr; } } for (int i = 0; i < map.length; i++) { if (map[i] == null) { map[i] = NONE; } } return map; } }