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Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/cmp_abs.c')
-rw-r--r-- | Build/source/libs/mpfr/mpfr-src/src/cmp_abs.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/Build/source/libs/mpfr/mpfr-src/src/cmp_abs.c b/Build/source/libs/mpfr/mpfr-src/src/cmp_abs.c new file mode 100644 index 00000000000..62ce27ff1d1 --- /dev/null +++ b/Build/source/libs/mpfr/mpfr-src/src/cmp_abs.c @@ -0,0 +1,94 @@ +/* mpfr_cmpabs -- compare the absolute values of two FP numbers + +Copyright 1999, 2001-2004, 2006-2015 Free Software Foundation, Inc. +Contributed by the AriC and Caramel 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 +http://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 a positive value if abs(b) > abs(c), 0 if abs(b) = abs(c), and + a negative value if abs(b) < abs(c). Neither b nor c may be NaN. */ + +int +mpfr_cmpabs (mpfr_srcptr b, mpfr_srcptr c) +{ + mpfr_exp_t be, ce; + mp_size_t bn, cn; + mp_limb_t *bp, *cp; + + if (MPFR_ARE_SINGULAR (b, c)) + { + if (MPFR_IS_NAN (b) || MPFR_IS_NAN (c)) + { + MPFR_SET_ERANGE (); + return 0; + } + else if (MPFR_IS_INF (b)) + return ! MPFR_IS_INF (c); + else if (MPFR_IS_INF (c)) + return -1; + else if (MPFR_IS_ZERO (c)) + return ! MPFR_IS_ZERO (b); + else /* b == 0 */ + return -1; + } + + MPFR_ASSERTD (MPFR_IS_PURE_FP (b)); + MPFR_ASSERTD (MPFR_IS_PURE_FP (c)); + + /* Now that we know that b and c are pure FP numbers (i.e. they have + a meaningful exponent), we use MPFR_EXP instead of MPFR_GET_EXP to + allow exponents outside the current exponent range. For instance, + this is useful for mpfr_pow, which compares values to __gmpfr_one. + This is for internal use only! For compatibility with other MPFR + versions, the user must still provide values that are representable + in the current exponent range. */ + be = MPFR_EXP (b); + ce = MPFR_EXP (c); + if (be > ce) + return 1; + if (be < ce) + return -1; + + /* exponents are equal */ + + bn = MPFR_LIMB_SIZE(b)-1; + cn = MPFR_LIMB_SIZE(c)-1; + + bp = MPFR_MANT(b); + cp = MPFR_MANT(c); + + for ( ; bn >= 0 && cn >= 0; bn--, cn--) + { + if (bp[bn] > cp[cn]) + return 1; + if (bp[bn] < cp[cn]) + return -1; + } + + for ( ; bn >= 0; bn--) + if (bp[bn]) + return 1; + + for ( ; cn >= 0; cn--) + if (cp[cn]) + return -1; + + return 0; +} |