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glibc/stdlib/cmp.c
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/* mpn_cmp -- Compare two low-level natural-number integers. | |
Copyright (C) 1991-2016 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 | |
<http://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; | |
} |