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/* mpf_cmp -- Compare two floats.
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Copyright 1993, 1994, 1996, 2001, 2015 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 either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any
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later version.
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or both in parallel, as here.
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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 General Public License
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for more details.
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You should have received copies of the GNU General Public License and the
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GNU Lesser General Public License along with the GNU MP Library. If not,
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see https://www.gnu.org/licenses/. */
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#include "gmp.h"
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#include "gmp-impl.h"
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int
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mpf_cmp (mpf_srcptr u, mpf_srcptr v) __GMP_NOTHROW
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{
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mp_srcptr up, vp;
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mp_size_t usize, vsize;
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mp_exp_t uexp, vexp;
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int cmp;
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int usign;
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usize = SIZ(u);
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vsize = SIZ(v);
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usign = usize >= 0 ? 1 : -1;
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/* 1. Are the signs different? */
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if ((usize ^ vsize) >= 0)
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{
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/* U and V are both non-negative or both negative. */
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if (usize == 0)
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/* vsize >= 0 */
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return -(vsize != 0);
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if (vsize == 0)
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/* usize >= 0 */
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return usize != 0;
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/* Fall out. */
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}
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else
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{
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/* Either U or V is negative, but not both. */
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return usign;
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}
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/* U and V have the same sign and are both non-zero. */
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uexp = EXP(u);
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vexp = EXP(v);
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/* 2. Are the exponents different? */
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if (uexp > vexp)
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return usign;
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if (uexp < vexp)
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return -usign;
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usize = ABS (usize);
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vsize = ABS (vsize);
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up = PTR (u);
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vp = PTR (v);
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#define STRICT_MPF_NORMALIZATION 0
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#if ! STRICT_MPF_NORMALIZATION
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/* Ignore zeroes at the low end of U and V. */
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do {
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mp_limb_t tl;
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tl = up[0];
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MPN_STRIP_LOW_ZEROS_NOT_ZERO (up, usize, tl);
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tl = vp[0];
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MPN_STRIP_LOW_ZEROS_NOT_ZERO (vp, vsize, tl);
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} while (0);
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#endif
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if (usize > vsize)
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{
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cmp = mpn_cmp (up + usize - vsize, vp, vsize);
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/* if (cmp == 0) */
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/* return usign; */
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++cmp;
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}
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else if (vsize > usize)
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{
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cmp = mpn_cmp (up, vp + vsize - usize, usize);
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/* if (cmp == 0) */
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/* return -usign; */
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}
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else
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{
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cmp = mpn_cmp (up, vp, usize);
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if (cmp == 0)
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return 0;
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}
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return cmp > 0 ? usign : -usign;
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}
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