Finite Field Arithmetic

fz_pred.ads


   1 ------------------------------------------------------------------------------
   2 ------------------------------------------------------------------------------
   3 -- This file is part of 'Finite Field Arithmetic', aka 'FFA'.               --
   4 --                                                                          --
   5 -- (C) 2019 Stanislav Datskovskiy ( www.loper-os.org )                      --
   6 -- http://wot.deedbot.org/17215D118B7239507FAFED98B98228A001ABFFC7.html     --
   7 --                                                                          --
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  17 ------------------------------------------------------------------------------
  18 ------------------------------------------------------------------------------
  19 
  20 with Words; use Words;
  21 with FZ_Type; use FZ_Type;
  22 
  23 
  24 package FZ_Pred is
  25    
  26    pragma Pure;
  27    
  28    --------------------------------------------
  29    -- Fundamental Predicate Operations on FZ --
  30    --------------------------------------------
  31    
  32    -- 1 iff N == 0 (branch-free); else 0
  33    function FZ_ZeroP(N : in FZ) return WBool;
  34    pragma Inline_Always(FZ_ZeroP);
  35    
  36    -- 1 iff N != 0 (branch-free); else 0
  37    function FZ_NZeroP(N : in FZ) return WBool;
  38    pragma Inline_Always(FZ_NZeroP);
  39    
  40    -- 1 iff N is odd
  41    function FZ_OddP(N : in FZ) return WBool;
  42    pragma Inline_Always(FZ_OddP);
  43    
  44    -- 1 iff N fits inside one Word
  45    function FZ_OneWordP(N : in FZ) return WBool;
  46    pragma Inline_Always(FZ_OneWordP);
  47    
  48 end FZ_Pred;