1 /* |
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2 * Copyright (c) 2002, 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 */ |
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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 class ShiftDecoder extends InstructionDecoder { |
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30 final int op3; |
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31 final String name; |
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32 final int rtlOperation; |
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33 |
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34 ShiftDecoder(int op3, String name, int rtlOperation) { |
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35 this.op3 = op3; |
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36 this.name = name; |
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37 this.rtlOperation = rtlOperation; |
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38 } |
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39 |
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40 private ImmediateOrRegister getShiftLength(int instruction) { |
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41 boolean iBit = isIBitSet(instruction); |
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42 ImmediateOrRegister operand2 = null; |
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43 if (iBit) { |
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44 int value = instruction & SHIFT_COUNT_5_MASK; |
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45 operand2 = new Immediate(new Short((short)value)); |
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46 } else { |
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47 operand2 = SPARCRegisters.getRegister(getSourceRegister2(instruction)); |
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48 } |
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49 return operand2; |
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50 } |
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51 |
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52 Instruction decode(int instruction, |
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53 SPARCInstructionFactory factory) { |
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54 SPARCRegister rs1 = SPARCRegisters.getRegister(getSourceRegister1(instruction)); |
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55 SPARCRegister rd = SPARCRegisters.getRegister(getDestinationRegister(instruction)); |
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56 ImmediateOrRegister operand2 = getShiftLength(instruction); |
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57 return factory.newShiftInstruction(name, op3, rtlOperation, rs1, operand2, rd); |
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58 } |
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59 } |
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