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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;