diff options
Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/get_flt.c')
-rw-r--r-- | Build/source/libs/mpfr/mpfr-src/src/get_flt.c | 133 |
1 files changed, 0 insertions, 133 deletions
diff --git a/Build/source/libs/mpfr/mpfr-src/src/get_flt.c b/Build/source/libs/mpfr/mpfr-src/src/get_flt.c deleted file mode 100644 index 1b8685e1c60..00000000000 --- a/Build/source/libs/mpfr/mpfr-src/src/get_flt.c +++ /dev/null @@ -1,133 +0,0 @@ -/* mpfr_get_flt -- convert a mpfr_t to a machine single precision float - -Copyright 2009-2020 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 <float.h> /* for FLT_MIN */ - -#define MPFR_NEED_LONGLONG_H -#include "mpfr-impl.h" - -#include "ieee_floats.h" - -#define FLT_NEG_ZERO ((float) DBL_NEG_ZERO) -#define MPFR_FLT_INFM ((float) MPFR_DBL_INFM) -#define MPFR_FLT_INFP ((float) MPFR_DBL_INFP) - -float -mpfr_get_flt (mpfr_srcptr src, mpfr_rnd_t rnd_mode) -{ - int negative; - mpfr_exp_t e; - float d; - - /* in case of NaN, +Inf, -Inf, +0, -0, the conversion from double to float - is exact */ - if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (src))) - return (float) mpfr_get_d (src, rnd_mode); - - e = MPFR_GET_EXP (src); - negative = MPFR_IS_NEG (src); - - if (MPFR_UNLIKELY(rnd_mode == MPFR_RNDA)) - rnd_mode = negative ? MPFR_RNDD : MPFR_RNDU; - - /* FIXME: The code below assumes the IEEE-754 binary32 format - with subnormal support. Fix it by converting to double, then - to float, and in case of binary radix (for which we want - correct rounding), handle double-rounding issues somewhere - in the code? */ - - /* the smallest positive normal float number is 2^(-126) = 0.5*2^(-125), - and the smallest positive subnormal number is 2^(-149) = 0.5*2^(-148) */ - if (MPFR_UNLIKELY (e < -148)) - { - /* |src| < 2^(-149), i.e., |src| is smaller than the smallest positive - subnormal number. - In round-to-nearest mode, 2^(-150) is rounded to zero. - */ - d = negative ? - (rnd_mode == MPFR_RNDD || - (rnd_mode == MPFR_RNDN && mpfr_cmp_si_2exp (src, -1, -150) < 0) - ? -FLT_MIN : FLT_NEG_ZERO) : - (rnd_mode == MPFR_RNDU || - (rnd_mode == MPFR_RNDN && mpfr_cmp_si_2exp (src, 1, -150) > 0) - ? FLT_MIN : 0.0); - if (d != 0.0) /* we multiply FLT_MIN = 2^(-126) by FLT_EPSILON = 2^(-23) - to get +-2^(-149) */ - d *= FLT_EPSILON; - } - /* the largest normal number is 2^128*(1-2^(-24)) = 0.111...111e128 */ - else if (MPFR_UNLIKELY (e > 128)) - { - d = negative ? - (rnd_mode == MPFR_RNDZ || rnd_mode == MPFR_RNDU ? - -FLT_MAX : MPFR_FLT_INFM) : - (rnd_mode == MPFR_RNDZ || rnd_mode == MPFR_RNDD ? - FLT_MAX : MPFR_FLT_INFP); - } - else /* -148 <= e <= 127 */ - { - int nbits; - mp_limb_t tp[MPFR_LIMBS_PER_FLT]; - int carry; - double dd; - - nbits = IEEE_FLT_MANT_DIG; /* 24 */ - if (MPFR_UNLIKELY (e < -125)) - /*In the subnormal case, compute the exact number of significant bits*/ - { - nbits += 125 + e; - MPFR_ASSERTD (1 <= nbits && nbits < 24); - } - carry = mpfr_round_raw_4 (tp, MPFR_MANT(src), MPFR_PREC(src), negative, - nbits, rnd_mode); - /* we perform the reconstruction using the 'double' type here, - knowing the result is exactly representable as 'float' */ - if (MPFR_UNLIKELY(carry)) - dd = 1.0; - else - { -#if MPFR_LIMBS_PER_FLT == 1 - dd = (double) tp[0] / MP_BASE_AS_DOUBLE; -#else - mp_size_t np, i; - np = MPFR_PREC2LIMBS (nbits); - MPFR_ASSERTD(np <= MPFR_LIMBS_PER_FLT); - /* The following computations are exact thanks to the previous - mpfr_round_raw. */ - dd = (double) tp[0] / MP_BASE_AS_DOUBLE; - for (i = 1 ; i < np ; i++) - dd = (dd + tp[i]) / MP_BASE_AS_DOUBLE; - /* dd is the mantissa (between 1/2 and 1) of the argument rounded - to 24 bits */ -#endif - } - dd = mpfr_scale2 (dd, e); - if (negative) - dd = -dd; - - /* convert (exactly) to float */ - d = (float) dd; - } - - return d; -} - |