49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/* mpn_cmp -- Compare two low-level natural-number integers.
|
|
|
|
Copyright (C) 1991-2022 Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU MP Library.
|
|
|
|
The GNU MP Library is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or (at your
|
|
option) any later version.
|
|
|
|
The GNU MP Library is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with the GNU MP Library; see the file COPYING.LIB. If not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <gmp.h>
|
|
#include "gmp-impl.h"
|
|
|
|
/* Compare OP1_PTR/OP1_SIZE with OP2_PTR/OP2_SIZE.
|
|
There are no restrictions on the relative sizes of
|
|
the two arguments.
|
|
Return 1 if OP1 > OP2, 0 if they are equal, and -1 if OP1 < OP2. */
|
|
|
|
int
|
|
mpn_cmp (mp_srcptr op1_ptr, mp_srcptr op2_ptr, mp_size_t size)
|
|
{
|
|
mp_size_t i;
|
|
mp_limb_t op1_word, op2_word;
|
|
|
|
for (i = size - 1; i >= 0; i--)
|
|
{
|
|
op1_word = op1_ptr[i];
|
|
op2_word = op2_ptr[i];
|
|
if (op1_word != op2_word)
|
|
goto diff;
|
|
}
|
|
return 0;
|
|
diff:
|
|
/* This can *not* be simplified to
|
|
op2_word - op2_word
|
|
since that expression might give signed overflow. */
|
|
return (op1_word > op2_word) ? 1 : -1;
|
|
}
|