Subversion Repositories ft816float

// ============================================================================

//        __

//   \\__/ o\    (C) 2020-2022  Robert Finch, Waterloo

//    \  __ /    All rights reserved.

//     \/_//     robfinch@finitron.ca

//       ||

//

//      DPDUnpack.sv

//

// BSD 3-Clause License

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are met:

//

// 1. Redistributions of source code must retain the above copyright notice, this

//    list of conditions and the following disclaimer.

//

// 2. Redistributions in binary form must reproduce the above copyright notice,

//    this list of conditions and the following disclaimer in the documentation

//    and/or other materials provided with the distribution.

//

// 3. Neither the name of the copyright holder nor the names of its

//    contributors may be used to endorse or promote products derived from

//    this software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE

// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//

// ============================================================================

import DFPPkg::*;

module DFPUnpack128(i, o);

input DFP128 i;

output DFP128U o;

assign o.sign = i.sign;

assign o.exp = {i.combo[4:3]==2'b11 ? i.combo[2:1] : i.combo[4:3],i.expc};

assign o.nan = i.combo==5'b11111;

assign o.qnan = i.combo==5'b11111 && i.expc[11]==1'b0;

assign o.snan = i.combo==5'b11111 && i.expc[11]==1'b1;

assign o.infinity = i.combo==5'b11110;

DPDDecodeN #(.N(11)) u1 (i.sigc, o.sig[131:0]);

assign o.sig[135:132] = i.combo[4:3]==2'b11 ? {3'b100,i.combo[0]} : {1'b0,i.combo[2:0]};

endmodule

module DFPUnpack96(i, o);

input DFP96 i;

output DFP96U o;

assign o.sign = i.sign;

assign o.exp = {i.combo[4:3]==2'b11 ? i.combo[2:1] : i.combo[4:3],i.expc};

assign o.nan = i.combo==5'b11111;

assign o.qnan = i.combo==5'b11111 && i.expc[9]==1'b0;

assign o.snan = i.combo==5'b11111 && i.expc[9]==1'b1;

assign o.infinity = i.combo==5'b11110;

DPDDecodeN #(.N(8)) u1 (i.sigc, o.sig[95:0]);

assign o.sig[99:96] = i.combo[4:3]==2'b11 ? {3'b100,i.combo[0]} : {1'b0,i.combo[2:0]};

endmodule

module DFPUnpack64(i, o);

input DFP64 i;

output DFP64U o;

assign o.sign = i.sign;

assign o.exp = {i.combo[4:3]==2'b11 ? i.combo[2:1] : i.combo[4:3],i.expc};

assign o.nan = i.combo==5'b11111;

assign o.qnan = i.combo==5'b11111 && i.expc[7]==1'b0;

assign o.snan = i.combo==5'b11111 && i.expc[7]==1'b1;

assign o.infinity = i.combo==5'b11110;

DPDDecodeN #(.N(5)) u1 (i.sigc, o.sig[59:0]);

assign o.sig[63:60] = i.combo[4:3]==2'b11 ? {3'b100,i.combo[0]} : {1'b0,i.combo[2:0]};

endmodule