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-- This file is part of 'Finite Field Arithmetic', aka 'FFA'.               --
--                                                                          --
-- (C) 2017 Stanislav Datskovskiy ( www.loper-os.org )                      --
-- http://wot.deedbot.org/17215D118B7239507FAFED98B98228A001ABFFC7.html     --
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-- continue doing so for the indefinite future. In any case, please         --
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-- See also http://trilema.com/2015/a-new-software-licensing-paradigm .     --
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with Words; use Words;

-- Fundamental Operations on Words:
package Word_Ops is
   
   pragma Pure;
   
   -- Branch-free calculation of 'carry' from a machine-word addition.
   function W_Carry(A : in Word; B : in Word; S : in Word)
                   return WBool;
   
   -- Branch-free calculation of 'borrow' from a machine-word subtraction.
   function W_Borrow(A : in Word; B : in Word; D : in Word)
                    return WBool;
   
   -- Without any branching: if Sel == 0, return A; if Sel == 1, return B.
   function W_Mux(A : in Word; B : in Word; Sel : in WBool)
                 return Word;
   
end Word_Ops;