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Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/eq.c')
-rw-r--r-- | Build/source/libs/mpfr/mpfr-src/src/eq.c | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/Build/source/libs/mpfr/mpfr-src/src/eq.c b/Build/source/libs/mpfr/mpfr-src/src/eq.c deleted file mode 100644 index 68f69464bd9..00000000000 --- a/Build/source/libs/mpfr/mpfr-src/src/eq.c +++ /dev/null @@ -1,141 +0,0 @@ -/* mpfr_eq -- Compare two floats up to a specified bit #. - -Copyright 1999, 2001, 2003-2004, 2006-2020 Free Software Foundation, Inc. -Contributed by the AriC and Caramba projects, INRIA. - -This file is part of the GNU MPFR Library. - -The GNU MPFR 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 3 of the License, or (at your -option) any later version. - -The GNU MPFR 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 MPFR Library; see the file COPYING.LESSER. If not, see -https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., -51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ - - -#include "mpfr-impl.h" - -/* return non-zero if the first n_bits bits of u, v are equal, - 0 otherwise */ -int -mpfr_eq (mpfr_srcptr u, mpfr_srcptr v, unsigned long int n_bits) -{ - mpfr_limb_srcptr up, vp; - mp_size_t usize, vsize, size, i; - mpfr_exp_t uexp, vexp; - int k; - - if (MPFR_ARE_SINGULAR(u, v)) - { - if (MPFR_IS_NAN(u) || MPFR_IS_NAN(v)) - return 0; /* non equal */ - else if (MPFR_IS_INF(u) && MPFR_IS_INF(v)) - return (MPFR_SIGN(u) == MPFR_SIGN(v)); - else if (MPFR_IS_ZERO(u) && MPFR_IS_ZERO(v)) - return 1; - else - return 0; - } - - /* 1. Are the signs different? */ - if (MPFR_SIGN(u) != MPFR_SIGN(v)) - return 0; - - uexp = MPFR_GET_EXP (u); - vexp = MPFR_GET_EXP (v); - - /* 2. Are the exponents different? */ - if (uexp != vexp) - return 0; /* no bit agree */ - - usize = MPFR_LIMB_SIZE (u); - vsize = MPFR_LIMB_SIZE (v); - - if (vsize > usize) /* exchange u and v */ - { - up = MPFR_MANT(v); - vp = MPFR_MANT(u); - size = vsize; - vsize = usize; - usize = size; - } - else - { - up = MPFR_MANT(u); - vp = MPFR_MANT(v); - } - - /* now usize >= vsize */ - MPFR_ASSERTD(usize >= vsize); - - if (usize > vsize) - { - if ((unsigned long) vsize * GMP_NUMB_BITS < n_bits) - { - /* check if low min(PREC(u), n_bits) - (vsize * GMP_NUMB_BITS) - bits from u are non-zero */ - unsigned long remains = n_bits - (vsize * GMP_NUMB_BITS); - k = usize - vsize - 1; - while (k >= 0 && remains >= GMP_NUMB_BITS && !up[k]) - { - k--; - remains -= GMP_NUMB_BITS; - } - /* now either k < 0: all low bits from u are zero - or remains < GMP_NUMB_BITS: check high bits from up[k] - or up[k] <> 0: different */ - if (k >= 0 && (((remains < GMP_NUMB_BITS) && - (up[k] >> (GMP_NUMB_BITS - remains))) || - (remains >= GMP_NUMB_BITS && up[k]))) - return 0; /* surely too different */ - } - size = vsize; - } - else - { - size = usize; - } - - /* now size = min (usize, vsize) */ - - /* If size is too large wrt n_bits, reduce it to look only at the - high n_bits bits. - Otherwise, if n_bits > size * GMP_NUMB_BITS, reduce n_bits to - size * GMP_NUMB_BITS, since the extra low bits of one of the - operands have already been check above. */ - if ((unsigned long) size > 1 + (n_bits - 1) / GMP_NUMB_BITS) - size = 1 + (n_bits - 1) / GMP_NUMB_BITS; - else if (n_bits > (unsigned long) size * GMP_NUMB_BITS) - n_bits = size * GMP_NUMB_BITS; - - up += usize - size; - vp += vsize - size; - - for (i = size - 1; i > 0 && n_bits >= GMP_NUMB_BITS; i--) - { - if (up[i] != vp[i]) - return 0; - n_bits -= GMP_NUMB_BITS; - } - - /* now either i=0 or n_bits<GMP_NUMB_BITS */ - - /* since n_bits <= size * GMP_NUMB_BITS before the above for-loop, - we have the invariant n_bits <= (i+1) * GMP_NUMB_BITS, thus - we always have n_bits <= GMP_NUMB_BITS here */ - MPFR_ASSERTD(n_bits <= GMP_NUMB_BITS); - - if (n_bits & (GMP_NUMB_BITS - 1)) - return (up[i] >> (GMP_NUMB_BITS - (n_bits & (GMP_NUMB_BITS - 1))) == - vp[i] >> (GMP_NUMB_BITS - (n_bits & (GMP_NUMB_BITS - 1)))); - else - return (up[i] == vp[i]); -} |