1 /*

     2  * Copyright (c) 2002, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    24 

    25 package sun.jvm.hotspot.asm.sparc;

    26 

    27 import sun.jvm.hotspot.asm.*;

    28 

    29 class V9MOVccDecoder extends V9CMoveDecoder {

    30     private static String getMoveCCName(int conditionCode, int conditionFlag) {

    31         return "mov" + getConditionName(conditionCode, conditionFlag);

    32     }

    33 

    34     private static int getMoveConditionFlag(int instruction) {

    35         boolean cc2Bit = (instruction & CMOVE_CC2_MASK) != 0;

    36         int conditionFlag = (instruction & CMOVE_CC0_CC1_MASK) >>> CMOVE_CC_START_BIT;

    37         if (cc2Bit) conditionFlag |= (0x4); // 100;

    38         return conditionFlag;

    39     }

    40 

    41     Instruction decode(int instruction, SPARCInstructionFactory factory) {

    42         SPARCV9InstructionFactory v9factory = (SPARCV9InstructionFactory) factory;

    43         Instruction instr = null;

    44         int conditionFlag = getMoveConditionFlag(instruction);

    45         if (conditionFlag == CFLAG_RESERVED1 || conditionFlag == CFLAG_RESERVED2) {

    46             instr = v9factory.newIllegalInstruction(instruction);

    47         } else {

    48             int rdNum = getDestinationRegister(instruction);

    49             SPARCRegister rd = SPARCRegisters.getRegister(rdNum);

    50             int conditionCode = getMoveConditionCode(instruction);

    51             ImmediateOrRegister source = getCMoveSource(instruction, 11);

    52             String name = getMoveCCName(conditionCode, conditionFlag);

    53             instr = v9factory.newV9MOVccInstruction(name, conditionCode, conditionFlag, source, rd);

    54         }

    55 

    56         return instr;

    57     }

    58 }