1 /* mpf_eq -- Compare two floats up to a specified bit #.
3 Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc.
5 This file is part of the GNU MP Library.
7 The GNU MP Library is free software; you can redistribute it and/or modify
8 it under the terms of the GNU Library General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or (at your
10 option) any later version.
12 The GNU MP Library is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
15 License for more details.
17 You should have received a copy of the GNU Library General Public License
18 along with the GNU MP Library; see the file COPYING.LIB. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20 MA 02111-1307, USA. */
27 mpf_eq (mpf_srcptr u, mpf_srcptr v, unsigned long int n_bits)
32 unsigned long int n_bits;
36 mp_size_t usize, vsize, size, i;
46 /* 1. Are the signs different? */
47 if ((usize ^ vsize) >= 0)
49 /* U and V are both non-negative or both negative. */
59 /* Either U or V is negative, but not both. */
63 /* U and V have the same sign and are both non-zero. */
65 usign = usize >= 0 ? 1 : -1;
67 /* 2. Are the exponents different? */
69 return 0; /* ??? handle (uexp = vexp + 1) */
71 return 0; /* ??? handle (vexp = uexp + 1) */
79 /* Ignore zeroes at the low end of U and V. */
93 if (vsize * BITS_PER_MP_LIMB < n_bits)
94 return 0; /* surely too different */
97 else if (vsize > usize)
99 if (usize * BITS_PER_MP_LIMB < n_bits)
100 return 0; /* surely too different */
108 if (size > (n_bits + BITS_PER_MP_LIMB - 1) / BITS_PER_MP_LIMB)
109 size = (n_bits + BITS_PER_MP_LIMB - 1) / BITS_PER_MP_LIMB;
114 for (i = size - 1; i >= 0; i--)