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.*; 28 29 abstract class FloatDecoder extends InstructionDecoder { 30 final int opf; 31 final String name; 32 final int numSources; // 1 or 2; 33 final int src1Type; // RTLDT_FL_SINGLE, _DOUBLE, _QUAD 34 final int src2Type; // RTLDT_FL_SINGLE, _DOUBLE, _QUAD 35 final int resultType; // RTLDT_FL_SINGLE, _DOUBLE, _QUAD 36 37 FloatDecoder(int opf, String name, int src1Type, int src2Type, int resultType) { 38 this.opf = opf; 39 this.name = name; 40 numSources = 2; 41 this.src1Type = src1Type; 42 this.src2Type = src2Type; 43 this.resultType = resultType; 44 } 45 46 FloatDecoder(int opf, String name, int src2Type, int resultType) { 47 this.opf = opf; 48 this.name = name; 49 numSources = 1; 50 this.src1Type = RTLOP_UNKNOWN; 51 this.src2Type = src2Type; 52 this.resultType = resultType; 53 } 54 55 abstract Instruction decodeFloatInstruction(int instruction, 56 SPARCRegister rs1, SPARCRegister rs2, SPARCRegister rd, 57 SPARCInstructionFactory factory); 58 59 Instruction decode(int instruction, SPARCInstructionFactory factory) { 60 int rs1Num = getSourceRegister1(instruction); 61 int rs2Num = getSourceRegister2(instruction); 62 int rdNum = getDestinationRegister(instruction); 63 64 SPARCRegister rs1 = null; 65 if (numSources == 2) { 66 rs1 = RegisterDecoder.decode(src1Type, rs1Num); 67 if (rs1 == null) { 68 return factory.newIllegalInstruction(instruction); 69 } 70 } 71 72 SPARCRegister rd = RegisterDecoder.decode(resultType, rdNum); 73 SPARCRegister rs2 = RegisterDecoder.decode(src2Type, rs2Num); 74 if (rd == null || rs2 == null) { 75 return factory.newIllegalInstruction(instruction); 76 } 77 78 return decodeFloatInstruction(instruction, rs1, rs2, rd, factory); 79 } 80 }