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robfinch |
// ============================================================================
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// __
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// \\__/ o\ (C) 2020 Robert Finch, Waterloo
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// \ __ / All rights reserved.
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// \/_// robfinch@finitron.ca
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// ||
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//
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// fp.sv
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//
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// This source file is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This source file is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see .
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//
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// ============================================================================
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//
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package fp;
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`define QINFOS 23'h7FC000 // info
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`define QSUBINF 4'd1
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`define QINFDIV 4'd2
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`define QZEROZERO 4'd3
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`define QINFZERO 4'd4
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`define QSQRTINF 4'd5
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`define QSQRTNEG 4'd6
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`define QSUBINFS 31'h7FC00001 // - infinity - infinity
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`define QINFDIVS 31'h7FC00002 // - infinity / infinity
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`define QZEROZEROS 31'h7FC00003 // - zero / zero
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`define QINFZEROS 31'h7FC00004 // - infinity X zero
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`define QSQRTINFS 31'h7FC00005 // - square root of infinity
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`define QSQRTNEGS 31'h7FC00006 // - square root of negaitve number
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`define QINFOD 52'hFF80000000000 // info
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`define QSUBINFD 63'h7FF0000000000001 // - infinity - infinity
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`define QINFDIVD 63'h7FF0000000000002 // - infinity / infinity
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`define QZEROZEROD 63'h7FF0000000000003 // - zero / zero
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`define QINFZEROD 63'h7FF0000000000004 // - infinity X zero
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`define QSQRTINFD 63'h7FF0000000000005 // - square root of infinity
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`define QSQRTNEGD 63'h7FF0000000000006 // - square root of negaitve number
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`define QINFODX 64'hFF800000_00000000 // info
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`define QSUBINFDX 79'h7FFF000000_0000000001 // - infinity - infinity
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`define QINFDIVDX 79'h7FFF000000_0000000002 // - infinity / infinity
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`define QZEROZERODX 79'h7FFF000000_0000000003 // - zero / zero
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`define QINFZERODX 79'h7FFF000000_0000000004 // - infinity X zero
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`define QSQRTINFDX 79'h7FFF000000_0000000005 // - square root of infinity
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`define QSQRTNEGDX 79'h7FFF000000_0000000006 // - square root of negaitve number
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`define QINFOQ 112'hFF800000_0000000000_0000000000 // info
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`define QSUBINFQ 127'h7F_FF00000000_0000000000_0000000001 // - infinity - infinity
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`define QINFDIVQ 127'h7F_FF00000000_0000000000_0000000002 // - infinity / infinity
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`define QZEROZEROQ 127'h7F_FF00000000_0000000000_0000000003 // - zero / zero
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`define QINFZEROQ 127'h7F_FF00000000_0000000000_0000000004 // - infinity X zero
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`define QSQRTINFQ 127'h7F_FF00000000_0000000000_0000000005 // - square root of infinity
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`define QSQRTNEGQ 127'h7F_FF00000000_0000000000_0000000006 // - square root of negaitve number
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`define POINT5S 32'h3F000000
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`define POINT5SX 40'h3F80000000
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`define POINT5D 64'h3FE0000000000000
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`define POINT5DX 80'h3FFE0000000000000000
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`define ZEROS 32'h00000000
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`define ZEROSX 40'h0000000000
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`define ZEROD 64'h0000000000000000
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`define ZERODX 80'h00000000000000000000
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`define AIN 3'd0
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`define BIN 3'd1
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`define CIN 3'd2
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`define RES 3'd3
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`define POINT5 3'd4
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`define ZERO 3'd5
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`define MIN_LATENCY 1'b1
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parameter FPWID = 64;
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// This file contains defintions for fields to ease dealing with different fp
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// widths. Some of the code still needs to be modified to support widths
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// other than standard 32,64 or 80 bit.
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localparam MSB = FPWID-1;
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localparam EMSB = FPWID==128 ? 14 :
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FPWID==96 ? 14 :
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FPWID==80 ? 14 :
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FPWID==64 ? 10 :
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FPWID==52 ? 10 :
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FPWID==48 ? 10 :
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FPWID==44 ? 10 :
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FPWID==42 ? 10 :
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FPWID==40 ? 9 :
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FPWID==32 ? 7 :
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FPWID==24 ? 6 : 4;
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localparam FMSB = FPWID==128 ? (111) :
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FPWID==96 ? (79) :
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FPWID==80 ? (63) :
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FPWID==64 ? (51) :
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FPWID==52 ? (39) :
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FPWID==48 ? (35) :
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FPWID==44 ? (31) :
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FPWID==42 ? (29) :
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FPWID==40 ? (28) :
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FPWID==32 ? (22) :
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FPWID==24 ? (15) : (9);
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localparam FX = (FMSB+2)*2; // the MSB of the expanded fraction
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localparam EX = FX + 1 + EMSB + 1 + 1 - 1;
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endpackage
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