| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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 _ 6 4 -- |
| -- -- |
| -- 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 -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- 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 64-bit discrete type values to be treated as signed. |
| |
| package System.Compare_Array_Signed_64 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_S64 |
| (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 the addresses are double word aligned, the function iterates on the |
| -- double words, and returns as soon as two double words are not equal. |
| -- |
| -- Otherwise, the function iterates on the unaligned double words, compares |
| -- them using unaligned accesses, and returns as soon as two double words |
| -- are not equal. |
| -- |
| -- Finally, at this point all the double words are equal. The result is |
| -- decided by comparing their lengths. |
| |
| end System.Compare_Array_Signed_64; |
