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1 /*
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2 * Copyright 2002 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.asm.sparc;
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26
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27 import sun.jvm.hotspot.asm.*;
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28
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29 abstract class FloatDecoder extends InstructionDecoder {
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30 final int opf;
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31 final String name;
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32 final int numSources; // 1 or 2;
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33 final int src1Type; // RTLDT_FL_SINGLE, _DOUBLE, _QUAD
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34 final int src2Type; // RTLDT_FL_SINGLE, _DOUBLE, _QUAD
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35 final int resultType; // RTLDT_FL_SINGLE, _DOUBLE, _QUAD
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36
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37 FloatDecoder(int opf, String name, int src1Type, int src2Type, int resultType) {
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38 this.opf = opf;
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39 this.name = name;
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40 numSources = 2;
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41 this.src1Type = src1Type;
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42 this.src2Type = src2Type;
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43 this.resultType = resultType;
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44 }
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45
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46 FloatDecoder(int opf, String name, int src2Type, int resultType) {
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47 this.opf = opf;
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48 this.name = name;
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49 numSources = 1;
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50 this.src1Type = RTLOP_UNKNOWN;
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51 this.src2Type = src2Type;
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52 this.resultType = resultType;
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53 }
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54
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55 abstract Instruction decodeFloatInstruction(int instruction,
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56 SPARCRegister rs1, SPARCRegister rs2, SPARCRegister rd,
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57 SPARCInstructionFactory factory);
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58
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59 Instruction decode(int instruction, SPARCInstructionFactory factory) {
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60 int rs1Num = getSourceRegister1(instruction);
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61 int rs2Num = getSourceRegister2(instruction);
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62 int rdNum = getDestinationRegister(instruction);
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63
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64 SPARCRegister rs1 = null;
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65 if (numSources == 2) {
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66 rs1 = RegisterDecoder.decode(src1Type, rs1Num);
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67 if (rs1 == null) {
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68 return factory.newIllegalInstruction(instruction);
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69 }
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70 }
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71
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72 SPARCRegister rd = RegisterDecoder.decode(resultType, rdNum);
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73 SPARCRegister rs2 = RegisterDecoder.decode(src2Type, rs2Num);
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74 if (rd == null || rs2 == null) {
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75 return factory.newIllegalInstruction(instruction);
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76 }
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77
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78 return decodeFloatInstruction(instruction, rs1, rs2, rd, factory);
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79 }
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80 }
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