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49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/* mpn_cmp -- Compare two low-level natural-number integers.
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Copyright (C) 1991-2017 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <gmp.h>
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#include "gmp-impl.h"
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/* Compare OP1_PTR/OP1_SIZE with OP2_PTR/OP2_SIZE.
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There are no restrictions on the relative sizes of
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the two arguments.
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Return 1 if OP1 > OP2, 0 if they are equal, and -1 if OP1 < OP2. */
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int
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mpn_cmp (mp_srcptr op1_ptr, mp_srcptr op2_ptr, mp_size_t size)
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{
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mp_size_t i;
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mp_limb_t op1_word, op2_word;
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for (i = size - 1; i >= 0; i--)
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{
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op1_word = op1_ptr[i];
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op2_word = op2_ptr[i];
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if (op1_word != op2_word)
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goto diff;
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}
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return 0;
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diff:
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/* This can *not* be simplified to
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op2_word - op2_word
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since that expression might give signed overflow. */
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return (op1_word > op2_word) ? 1 : -1;
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}
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