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ffa_ch12_karatsub...    1 ------------------------------------------------------------------------------
ffa_ch12_karatsub...    2 ------------------------------------------------------------------------------
ffa_ch12_karatsub...    3 -- This file is part of 'Finite Field Arithmetic', aka 'FFA'.               --
ffa_ch12_karatsub...    4 --                                                                          --
ffa_ch12_karatsub...    5 -- (C) 2018 Stanislav Datskovskiy ( www.loper-os.org )                      --
ffa_ch12_karatsub...    6 -- http://wot.deedbot.org/17215D118B7239507FAFED98B98228A001ABFFC7.html     --
ffa_ch12_karatsub...    7 --                                                                          --
ffa_ch12_karatsub...    8 -- You do not have, nor can you ever acquire the right to use, copy or      --
ffa_ch12_karatsub...    9 -- distribute this software ; Should you use this software for any purpose, --
ffa_ch12_karatsub...   10 -- or copy and distribute it to anyone or in any manner, you are breaking   --
ffa_ch12_karatsub...   11 -- the laws of whatever soi-disant jurisdiction, and you promise to         --
ffa_ch12_karatsub...   12 -- continue doing so for the indefinite future. In any case, please         --
ffa_ch12_karatsub...   13 -- always : read and understand any software ; verify any PGP signatures    --
ffa_ch12_karatsub...   14 -- that you use - for any purpose.                                          --
ffa_ch12_karatsub...   15 --                                                                          --
ffa_ch12_karatsub...   16 -- See also http://trilema.com/2015/a-new-software-licensing-paradigm .     --
ffa_ch12_karatsub...   17 ------------------------------------------------------------------------------
ffa_ch12_karatsub...   18 ------------------------------------------------------------------------------
ffa_ch12_karatsub...   19 
ffa_ch12_karatsub...   20 with FZ_Type; use FZ_Type;
ffa_ch12_karatsub...   21 
ffa_ch12_karatsub...   22 
ffa_ch12_karatsub...   23 package FZ_Sqr is
ffa_ch12_karatsub...   24    
ffa_ch12_karatsub...   25    pragma Pure;
ffa_ch12_karatsub...   26    
ffa_ch12_karatsub...   27    -- Karatsuba Threshhold - at or below this many Words, we use Comba mult.
ffa_ch12_karatsub...   28    Sqr_Karatsuba_Thresh : constant Indices := 8;
ffa_ch12_karatsub...   29    
ffa_ch12_karatsub...   30    -- Square. (CAUTION: UNBUFFERED)
ffa_ch12_karatsub...   31    procedure FZ_Square_Unbuffered(X     : in  FZ;
ffa_ch12_karatsub...   32                                   XX    : out FZ);
ffa_ch12_karatsub...   33    pragma Inline_Always(FZ_Square_Unbuffered);
ffa_ch12_karatsub...   34    
ffa_ch12_karatsub...   35    -- Comba's squaring. (CAUTION: UNBUFFERED)
ffa_ch12_karatsub...   36    procedure FZ_Sqr_Comba(X     : in  FZ;
ffa_ch12_karatsub...   37                           XX    : out FZ);
ffa_ch12_karatsub...   38    pragma Inline_Always(FZ_Sqr_Comba);
ffa_ch12_karatsub...   39    
ffa_ch12_karatsub...   40    -- Karatsuba's Squaring. (CAUTION: UNBUFFERED)
ffa_ch12_karatsub...   41    procedure Sqr_Karatsuba(X  : in  FZ;
ffa_ch12_karatsub...   42                            XX : out FZ)
ffa_ch12_karatsub...   43      with Pre => XX'Length = 2 * X'Length and
ffa_ch12_karatsub...   44      X'Length mod 2 = 0;
ffa_ch12_karatsub...   45    -- CAUTION: Inlining prohibited for Sqr_Karatsuba !
ffa_ch12_karatsub...   46    
ffa_ch12_karatsub...   47    -- Squaring. Preserves the inputs.
ffa_ch12_karatsub...   48    procedure FZ_Square_Buffered(X     : in  FZ;
ffa_ch12_karatsub...   49                                 XX_Lo : out FZ;
ffa_ch12_karatsub...   50                                 XX_Hi : out FZ);
ffa_ch12_karatsub...   51    pragma Inline_Always(FZ_Square_Buffered);
ffa_ch12_karatsub...   52    
ffa_ch12_karatsub...   53 end FZ_Sqr;