------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME LIBRARY COMPONENTS -- -- -- -- S Y S T E M . C O M P A R E _ A R R A Y _ S I G N E D _ 1 6 -- -- -- -- S p e c -- -- -- -- Copyright (C) 2002-2025, Free Software Foundation, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 3, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- . -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- This package contains functions for runtime comparisons on arrays whose -- elements are 16-bit discrete type values to be treated as signed. package System.Compare_Array_Signed_16 is -- Note: although the functions in this package are in a sense Pure, the -- package cannot be declared as Pure, since the arguments are addresses, -- not the data, and the result is not pure wrt the address values. function Compare_Array_S16 (Left : System.Address; Right : System.Address; Left_Len : Natural; Right_Len : Natural) return Integer; -- Compare the array starting at address ``Left`` of length ``Left_Len`` -- with the array starting at address ``Right`` of length ``Right_Len``. -- The comparison is in the normal Ada semantic sense of array -- comparison. -- -- The result is -1, 0, +1 for ``Left`` < ``Right``, ``Left`` = ``Right``, -- ``Left`` > ``Right`` respectively. -- -- If both addresses are word aligned, the function iterates through all -- of the equal words. -- -- Then, if the addresses are half word aligned, the function iterates on -- the remaining half words, and returns as soon as two half words are not -- equal. -- -- Otherwise, the function iterates on the remaining unaligned half words, -- compares them using unaligned accesses, and returns as soon as two half -- words are not equal. -- -- Finally, at this point, all the words are equal. The result is decided -- by comparing their lengths. end System.Compare_Array_Signed_16;