Mercurial > hg > truffle
annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/ppc/ZeroOrRegister.java @ 3735:61369a06f03c
Updated authors file.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 20:36:28 +0100 |
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1 /* |
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.sun.max.asm.ppc; |
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24 |
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25 import com.sun.max.asm.*; |
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26 import com.sun.max.util.*; |
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27 |
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28 /** |
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29 * The super type of all the {@link GPR General Purpose Registers} and the constant {@link Zero#ZERO}. |
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30 */ |
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31 public abstract class ZeroOrRegister extends AbstractSymbolicArgument { |
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32 |
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33 ZeroOrRegister(String name, int value) { |
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34 super(name, value); |
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35 } |
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36 |
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37 /** |
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38 * Determines if this register specifier is outside the range of registers |
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39 * {@code [target .. target+n]} where the range |
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40 * wraps at 32. |
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41 */ |
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42 public boolean isOutsideRegisterRange(GPR target, int n) { |
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43 final int rt = target.value(); |
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44 final int ra = value(); |
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45 final int numRegs = (n + 3) / 4; |
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46 final int lastReg = (rt + numRegs - 1) % 32; |
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47 final boolean wrapsAround = lastReg < rt; |
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48 if (wrapsAround) { |
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49 return lastReg < ra && ra < rt; |
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50 } |
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51 return ra < rt || lastReg < ra; |
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52 } |
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53 |
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54 public static Symbolizer<ZeroOrRegister> symbolizer() { |
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55 if (symbolizer == null) { |
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56 symbolizer = Symbolizer.Static.fromList(ZeroOrRegister.class, GPR.GPR_SYMBOLIZER, Zero.ZERO); |
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57 } |
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58 return symbolizer; |
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59 } |
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60 |
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61 // This must be lazily constructed to avoid dependency on the GPR class initializer |
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62 private static Symbolizer<ZeroOrRegister> symbolizer; |
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63 |
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64 } |