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Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/log10.c')
-rw-r--r-- | Build/source/libs/mpfr/mpfr-src/src/log10.c | 150 |
1 files changed, 0 insertions, 150 deletions
diff --git a/Build/source/libs/mpfr/mpfr-src/src/log10.c b/Build/source/libs/mpfr/mpfr-src/src/log10.c deleted file mode 100644 index d89516c2435..00000000000 --- a/Build/source/libs/mpfr/mpfr-src/src/log10.c +++ /dev/null @@ -1,150 +0,0 @@ -/* mpfr_log10 -- logarithm in base 10. - -Copyright 2001-2020 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. */ - -#define MPFR_NEED_LONGLONG_H -#include "mpfr-impl.h" - - /* The computation of r=log10(a) - - r=log10(a)=log(a)/log(10) - */ - -int -mpfr_log10 (mpfr_ptr r, mpfr_srcptr a, mpfr_rnd_t rnd_mode) -{ - int inexact; - MPFR_SAVE_EXPO_DECL (expo); - - MPFR_LOG_FUNC - (("a[%Pu]=%.*Rg rnd=%d", mpfr_get_prec (a), mpfr_log_prec, a, rnd_mode), - ("r[%Pu]=%.*Rg inexact=%d", - mpfr_get_prec (r), mpfr_log_prec, r, inexact)); - - /* If a is NaN, the result is NaN */ - if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (a))) - { - if (MPFR_IS_NAN (a)) - { - MPFR_SET_NAN (r); - MPFR_RET_NAN; - } - /* check for infinity before zero */ - else if (MPFR_IS_INF (a)) - { - if (MPFR_IS_NEG (a)) - /* log10(-Inf) = NaN */ - { - MPFR_SET_NAN (r); - MPFR_RET_NAN; - } - else /* log10(+Inf) = +Inf */ - { - MPFR_SET_INF (r); - MPFR_SET_POS (r); - MPFR_RET (0); /* exact */ - } - } - else /* a = 0 */ - { - MPFR_ASSERTD (MPFR_IS_ZERO (a)); - MPFR_SET_INF (r); - MPFR_SET_NEG (r); - MPFR_SET_DIVBY0 (); - MPFR_RET (0); /* log10(0) is an exact -infinity */ - } - } - - /* If a is negative, the result is NaN */ - if (MPFR_UNLIKELY (MPFR_IS_NEG (a))) - { - MPFR_SET_NAN (r); - MPFR_RET_NAN; - } - - /* If a is 1, the result is 0 */ - if (mpfr_cmp_ui (a, 1) == 0) - { - MPFR_SET_ZERO (r); - MPFR_SET_POS (r); - MPFR_RET (0); /* result is exact */ - } - - MPFR_SAVE_EXPO_MARK (expo); - - /* General case */ - { - /* Declaration of the intermediary variable */ - mpfr_t t, tt; - MPFR_ZIV_DECL (loop); - /* Declaration of the size variable */ - mpfr_prec_t Ny = MPFR_PREC(r); /* Precision of output variable */ - mpfr_prec_t Nt; /* Precision of the intermediary variable */ - mpfr_exp_t err; /* Precision of error */ - - /* compute the precision of intermediary variable */ - /* the optimal number of bits : see algorithms.tex */ - Nt = Ny + 4 + MPFR_INT_CEIL_LOG2 (Ny); - - /* initialize of intermediary variables */ - mpfr_init2 (t, Nt); - mpfr_init2 (tt, Nt); - - /* First computation of log10 */ - MPFR_ZIV_INIT (loop, Nt); - for (;;) - { - /* compute log10 */ - mpfr_set_ui (t, 10, MPFR_RNDN); /* 10 */ - mpfr_log (t, t, MPFR_RNDD); /* log(10) */ - mpfr_log (tt, a, MPFR_RNDN); /* log(a) */ - mpfr_div (t, tt, t, MPFR_RNDN); /* log(a)/log(10) */ - - /* estimation of the error */ - err = Nt - 4; - if (MPFR_LIKELY (MPFR_CAN_ROUND (t, err, Ny, rnd_mode))) - break; - - /* log10(10^n) is exact: - FIXME: Can we have 10^n exactly representable as a mpfr_t - but n can't fit an unsigned long? */ - if (MPFR_IS_POS (t) - && mpfr_integer_p (t) && mpfr_fits_ulong_p (t, MPFR_RNDN) - && !mpfr_ui_pow_ui (tt, 10, mpfr_get_ui (t, MPFR_RNDN), MPFR_RNDN) - && mpfr_cmp (a, tt) == 0) - break; - - /* actualization of the precision */ - MPFR_ZIV_NEXT (loop, Nt); - mpfr_set_prec (t, Nt); - mpfr_set_prec (tt, Nt); - } - MPFR_ZIV_FREE (loop); - - inexact = mpfr_set (r, t, rnd_mode); - - mpfr_clear (t); - mpfr_clear (tt); - } - - MPFR_SAVE_EXPO_FREE (expo); - return mpfr_check_range (r, inexact, rnd_mode); -} |