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[/] [ao486/] [trunk/] [rtl/] [ao486/] [pipeline/] [condition.v] - Blame information for rev 2

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1 2 alfik
/*
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 * Copyright (c) 2014, Aleksander Osman
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions are met:
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 *
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 * * Redistributions of source code must retain the above copyright notice, this
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 *   list of conditions and the following disclaimer.
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 *
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 * * Redistributions in binary form must reproduce the above copyright notice,
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 *   this list of conditions and the following disclaimer in the documentation
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 *   and/or other materials provided with the distribution.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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module condition(
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    input               oflag,
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    input               cflag,
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    input               sflag,
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    input               zflag,
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    input               pflag,
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    input       [3:0]   index,
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    output              condition
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);
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//------------------------------------------------------------------------------
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assign condition =
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    (index[3:0] == 4'd0)?    oflag :
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    (index[3:0] == 4'd1)?   !oflag :
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    (index[3:0] == 4'd2)?    cflag :
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    (index[3:0] == 4'd3)?   !cflag :
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    (index[3:0] == 4'd4)?    zflag :
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    (index[3:0] == 4'd5)?   !zflag :
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    (index[3:0] == 4'd6)?    (cflag | zflag) :
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    (index[3:0] == 4'd7)?   !(cflag | zflag) :
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    (index[3:0] == 4'd8)?    sflag :
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    (index[3:0] == 4'd9)?   !sflag :
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    (index[3:0] == 4'd10)?   pflag :
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    (index[3:0] == 4'd11)?  !pflag :
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    (index[3:0] == 4'd12)?   (sflag ^ oflag) :
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    (index[3:0] == 4'd13)?  !(sflag ^ oflag) :
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    (index[3:0] == 4'd14)?   ((sflag ^ oflag) | zflag) :
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                            !((sflag ^ oflag) | zflag);
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endmodule

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