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

//        __

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

//    \  __ /    All rights reserved.

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

//       ||

//

//      positFDP.v

//    - posit number fused dot product

//    - parameterized width

//    - performs: a*b +/- c*d

//

//

// 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 .

//

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

import posit::*;

module positFDP(op, a, b, c, d, o, zero, inf);

input op;

input [PSTWID-1:0] a;

input [PSTWID-1:0] b;

input [PSTWID-1:0] c;

input [PSTWID-1:0] d;

output [PSTWID-1:0] o;

output zero;

output inf;

wire [PSTWID+es+(PSTWID-es)*2-1:0] o1;

wire [PSTWID+es+(PSTWID-es)*2-1:0] o2;

positFDPMul u1 (a, b, o1, zero1, inf1);

positFDPMul u2 (c, d, o2, zero2, inf2);

positFDPAddsub u3 (op, o1, o2, o, zero, inf);

endmodule