1 /*
   2  * Copyright 2002 Sun Microsystems, Inc.  All Rights Reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.asm.sparc;
  26 
  27 import sun.jvm.hotspot.asm.Register;
  28 import sun.jvm.hotspot.utilities.Assert;
  29 
  30 public class SPARCFloatRegister extends SPARCRegister {
  31 
  32     public SPARCFloatRegister(int number) {
  33         super(number);
  34     }
  35 
  36     public int getNumber() {
  37         return number;
  38     }
  39 
  40     public static final int SINGLE_PRECISION = 1;
  41     public static final int DOUBLE_PRECISION = 2;
  42     public static final int QUAD_PRECISION = 3;
  43 
  44     public int getNumber(int width) {
  45         switch (width) {
  46         case SINGLE_PRECISION:
  47             Assert.that(number < 32, "bad single-prec fp register");
  48             return number;
  49 
  50         case DOUBLE_PRECISION:
  51             Assert.that(number < 64 && (number & 1) == 0, "bad double-prec fp register");
  52             return number & 0x1e | (number & 0x20) >> 5;
  53 
  54         case QUAD_PRECISION:
  55             Assert.that(number < 64 && (number & 3) == 0, "bad quad-prec fp register");
  56             return number & 0x1c | (number & 0x20) >> 5;
  57         }
  58         throw new RuntimeException("Invalid floating point width supplied");
  59     }
  60 
  61     private static final int nofRegisters = 63;
  62     public int getNumberOfRegisters() {
  63         return nofRegisters;
  64     }
  65 
  66     public boolean isFloat() {
  67         return true;
  68     }
  69 
  70     public boolean isFramePointer() {
  71         return false;
  72     }
  73 
  74     public boolean isStackPointer() {
  75         return false;
  76     }
  77 
  78     public boolean isV9Only() {
  79         return number > 31;
  80     }
  81 
  82     public boolean isValid() {
  83         return number >= 0 && number < nofRegisters;
  84     }
  85 
  86     public String toString() {
  87         return SPARCFloatRegisters.getRegisterName(number);
  88     }
  89 
  90 }