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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 Iron;
ffa_ch1_genesis.kv     21 
ffa_ch1_genesis.kv     22 package Words is
ffa_ch1_genesis.kv     23    
ffa_ch1_genesis.kv     24    pragma Pure;
ffa_ch1_genesis.kv     25    
ffa_ch1_genesis.kv     26    -- The most fundamental fact about Word: width.
ffa_ch1_genesis.kv     27    Bitness     : constant Positive := Iron.MachineBitness;
ffa_ch1_genesis.kv     28    
ffa_ch1_genesis.kv     29    -- It is possible to calculate BitnessLog2 at elaboration time,
ffa_ch1_genesis.kv     30    -- but we will avoid having ~any~ elaboration at all in FFA.
ffa_ch1_genesis.kv     31    BitnessLog2 : constant Positive := Iron.MachineBitnessLog2;
ffa_ch1_genesis.kv     32    
ffa_ch1_genesis.kv     33    -- The Word width, expressed in ~bytes~:
ffa_ch1_genesis.kv     34    Byteness    : constant Positive := Bitness / Iron.ByteBits;
ffa_ch1_genesis.kv     35    
ffa_ch11_tuning_a...   36    -- Nibbles per Word:
ffa_ch11_tuning_a...   37    Nibbleness  : constant Positive := Byteness * 2;
ffa_ch11_tuning_a...   38    
ffa_ch1_genesis.kv     39    -- What kind of words to use. Must be machine-word or smaller.
ffa_ch1_genesis.kv     40    type Word is mod 2**Bitness;
ffa_ch1_genesis.kv     41    for Word'Size use Bitness;
ffa_ch1_genesis.kv     42    
ffa_ch1_genesis.kv     43    -- The very same Word, but its only legal values are 0 and 1.
ffa_ch1_genesis.kv     44    subtype WBool is Word range 0 .. 1;
ffa_ch1_genesis.kv     45    
ffa_ch4_ffacalc.kv     46    -- Word, restricted to Nibble range.
ffa_ch4_ffacalc.kv     47    subtype Nibble is Word range 0 .. 16#F#;
ffa_ch4_ffacalc.kv     48    
ffa_ch1_genesis.kv     49    -- When we must refer to individual bit positions of a machine word:
ffa_ch1_genesis.kv     50    subtype WBit_Index is Natural range 0 .. Bitness - 1;
ffa_ch1_genesis.kv     51    
ffa_ch12_karatsub...   52    -- For when a computed Word is mandatorily expected to equal zero:
ffa_ch12_karatsub...   53    subtype WZeroOrDie is Word range 0 .. 0;
ffa_ch12_karatsub...   54    
ffa_ch1_genesis.kv     55 end Words;