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// ============================================================================
//        __
//   \\__/ o\    (C) 2020  Robert Finch, Waterloo
//    \  __ /    All rights reserved.
//     \/_//     robfinch<remove>@finitron.ca
//       ||
//
//      fp.sv
//
// This source file is free software: you can redistribute it and/or modify 
// it under the terms of the GNU Lesser General Public License as published 
// by the Free Software Foundation, either version 3 of the License, or     
// (at your option) any later version.                                      
//                                                                          
// This source file is distributed in the hope that it will be useful,      
// but WITHOUT ANY WARRANTY; without even the implied warranty of           
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            
// GNU General Public License for more details.                             
//                                                                          
// You should have received a copy of the GNU General Public License        
// along with this program.  If not, see <http://www.gnu.org/licenses/>.    
//                                                                          
// ============================================================================
//
package fp;

`ifndef FPWID
`define FPWID   64
`endif

`define QINFOS          23'h7FC000              // info
`define QSUBINF         4'd1
`define QINFDIV         4'd2
`define QZEROZERO       4'd3
`define QINFZERO        4'd4
`define QSQRTINF        4'd5
`define QSQRTNEG        4'd6

`define QSUBINFS        31'h7FC00001    // - infinity - infinity
`define QINFDIVS        31'h7FC00002    // - infinity / infinity
`define QZEROZEROS      31'h7FC00003    // - zero / zero
`define QINFZEROS       31'h7FC00004    // - infinity X zero
`define QSQRTINFS       31'h7FC00005    // - square root of infinity
`define QSQRTNEGS       31'h7FC00006    // - square root of negaitve number

`define QINFOD          52'hFF80000000000               // info
`define QSUBINFD        63'h7FF0000000000001    // - infinity - infinity
`define QINFDIVD        63'h7FF0000000000002    // - infinity / infinity
`define QZEROZEROD  63'h7FF0000000000003        // - zero / zero
`define QINFZEROD       63'h7FF0000000000004    // - infinity X zero
`define QSQRTINFD       63'h7FF0000000000005    // - square root of infinity
`define QSQRTNEGD       63'h7FF0000000000006    // - square root of negaitve number

`define QINFODX         64'hFF800000_00000000           // info
`define QSUBINFDX       79'h7FFF000000_0000000001       // - infinity - infinity
`define QINFDIVDX       79'h7FFF000000_0000000002       // - infinity / infinity
`define QZEROZERODX 79'h7FFF000000_0000000003   // - zero / zero
`define QINFZERODX      79'h7FFF000000_0000000004       // - infinity X zero
`define QSQRTINFDX      79'h7FFF000000_0000000005       // - square root of infinity
`define QSQRTNEGDX      79'h7FFF000000_0000000006       // - square root of negaitve number

`define QINFOQ          112'hFF800000_0000000000_0000000000             // info
`define QSUBINFQ        127'h7F_FF00000000_0000000000_0000000001        // - infinity - infinity
`define QINFDIVQ        127'h7F_FF00000000_0000000000_0000000002        // - infinity / infinity
`define QZEROZEROQ  127'h7F_FF00000000_0000000000_0000000003    // - zero / zero
`define QINFZEROQ       127'h7F_FF00000000_0000000000_0000000004        // - infinity X zero
`define QSQRTINFQ       127'h7F_FF00000000_0000000000_0000000005        // - square root of infinity
`define QSQRTNEGQ       127'h7F_FF00000000_0000000000_0000000006        // - square root of negaitve number

`define POINT5S         32'h3F000000
`define POINT5SX        40'h3F80000000
`define POINT5D         64'h3FE0000000000000
`define POINT5DX        80'h3FFE0000000000000000
`define ZEROS                   32'h00000000
`define ZEROSX          40'h0000000000
`define ZEROD                   64'h0000000000000000
`define ZERODX          80'h00000000000000000000

`define AIN                     3'd0
`define BIN                     3'd1
`define CIN                     3'd2
`define RES                     3'd3
`define POINT5  3'd4
`define ZERO            3'd5

`define SUPPORT_DENORMALS   1'b1
`define MIN_LATENCY             1'b1

parameter FPWID = `FPWID;

// This file contains defintions for fields to ease dealing with different fp
// widths. Some of the code still needs to be modified to support widths
// other than standard 32,64 or 80 bit.
localparam MSB = FPWID-1;
localparam EMSB = FPWID==128 ? 14 :
          FPWID==96 ? 14 :
          FPWID==80 ? 14 :
          FPWID==64 ? 10 :
                                  FPWID==52 ? 10 :
                                  FPWID==48 ? 10 :
                                  FPWID==44 ? 10 :
                                  FPWID==42 ? 10 :
                                  FPWID==40 ?  9 :
                                  FPWID==32 ?  7 :
                                  FPWID==24 ?  6 : 4;
localparam FMSB = FPWID==128 ? (111) :
          FPWID==96 ? (79) :
          FPWID==80 ? (63) :
          FPWID==64 ? (51) :
                                  FPWID==52 ? (39) :
                                  FPWID==48 ? (35) :
                                  FPWID==44 ? (31) :
                                  FPWID==42 ? (29) :
                                  FPWID==40 ? (28) :
                                  FPWID==32 ? (22) :
                                  FPWID==24 ? (15) : (9);
localparam FX = (FMSB+2)*2;     // the MSB of the expanded fraction
localparam EX = FX + 1 + EMSB + 1 + 1 - 1;
endpackage