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ffa_ch1_genesis.kv      1 ------------------------------------------------------------------------------
ffa_ch1_genesis.kv      2 ------------------------------------------------------------------------------
ffa_ch1_genesis.kv      3 -- This file is part of 'Finite Field Arithmetic', aka 'FFA'.               --
ffa_ch1_genesis.kv      4 --                                                                          --
ffa_ch1_genesis.kv      5 -- (C) 2017 Stanislav Datskovskiy ( www.loper-os.org )                      --
ffa_ch1_genesis.kv      6 -- http://wot.deedbot.org/17215D118B7239507FAFED98B98228A001ABFFC7.html     --
ffa_ch1_genesis.kv      7 --                                                                          --
ffa_ch1_genesis.kv      8 -- You do not have, nor can you ever acquire the right to use, copy or      --
ffa_ch1_genesis.kv      9 -- distribute this software ; Should you use this software for any purpose, --
ffa_ch1_genesis.kv     10 -- or copy and distribute it to anyone or in any manner, you are breaking   --
ffa_ch1_genesis.kv     11 -- the laws of whatever soi-disant jurisdiction, and you promise to         --
ffa_ch1_genesis.kv     12 -- continue doing so for the indefinite future. In any case, please         --
ffa_ch1_genesis.kv     13 -- always : read and understand any software ; verify any PGP signatures    --
ffa_ch1_genesis.kv     14 -- that you use - for any purpose.                                          --
ffa_ch1_genesis.kv     15 --                                                                          --
ffa_ch1_genesis.kv     16 -- See also http://trilema.com/2015/a-new-software-licensing-paradigm .     --
ffa_ch1_genesis.kv     17 ------------------------------------------------------------------------------
ffa_ch1_genesis.kv     18 ------------------------------------------------------------------------------
ffa_ch1_genesis.kv     19 
ffa_ch1_genesis.kv     20 with Words;   use Words;
ffa_ch1_genesis.kv     21 with FZ_Type; use FZ_Type;
ffa_ch1_genesis.kv     22 
ffa_ch1_genesis.kv     23 -- Fundamental Arithmetic operators on FZ:
ffa_ch1_genesis.kv     24 package FZ_Arith is
ffa_ch1_genesis.kv     25    
ffa_ch1_genesis.kv     26    pragma Pure;
ffa_ch1_genesis.kv     27    
ffa_ch1_genesis.kv     28    -- Sum := X + Y; Overflow := Carry
ffa_ch1_genesis.kv     29    procedure FZ_Add(X          : in    FZ;
ffa_ch1_genesis.kv     30                     Y          : in    FZ;
ffa_ch1_genesis.kv     31                     Sum        : out   FZ;
ffa_ch1_genesis.kv     32                     Overflow   : out   WBool);
ffa_ch1_genesis.kv     33    pragma Precondition(X'Length = Y'Length and X'Length = Sum'Length);
ffa_ch1_genesis.kv     34    
ffa_ch1_genesis.kv     35    -- Difference := X - Y; Underflow := Borrow
ffa_ch1_genesis.kv     36    procedure FZ_Sub(X          : in  FZ;
ffa_ch1_genesis.kv     37                     Y          : in  FZ;
ffa_ch1_genesis.kv     38                     Difference : out FZ;
ffa_ch1_genesis.kv     39                     Underflow  : out WBool);
ffa_ch1_genesis.kv     40    pragma Precondition(X'Length = Y'Length and X'Length = Difference'Length);
ffa_ch1_genesis.kv     41    
ffa_ch1_genesis.kv     42 end FZ_Arith;