diff options
Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/get_ld.c')
-rw-r--r-- | Build/source/libs/mpfr/mpfr-src/src/get_ld.c | 339 |
1 files changed, 0 insertions, 339 deletions
diff --git a/Build/source/libs/mpfr/mpfr-src/src/get_ld.c b/Build/source/libs/mpfr/mpfr-src/src/get_ld.c deleted file mode 100644 index 6b6a5b9df6c..00000000000 --- a/Build/source/libs/mpfr/mpfr-src/src/get_ld.c +++ /dev/null @@ -1,339 +0,0 @@ -/* mpfr_get_ld, mpfr_get_ld_2exp -- convert a multiple precision floating-point - number to a machine long double - -Copyright 2002-2020 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> /* needed so that MPFR_LDBL_MANT_DIG is correctly defined */ - -#include "mpfr-impl.h" - -#if defined(HAVE_LDOUBLE_IS_DOUBLE) - -/* special code when "long double" is the same format as "double" */ -long double -mpfr_get_ld (mpfr_srcptr x, mpfr_rnd_t rnd_mode) -{ - return (long double) mpfr_get_d (x, rnd_mode); -} - -#elif defined(HAVE_LDOUBLE_IEEE_EXT_LITTLE) - -/* Note: The code will return a result with a 64-bit precision, even - if the rounding precision is only 53 bits like on FreeBSD and - NetBSD 6- (or with GCC's -mpc64 option to simulate this on other - platforms). This is consistent with how strtold behaves in these - cases, for instance. */ - -/* special code for IEEE 754 little-endian extended format */ -long double -mpfr_get_ld (mpfr_srcptr x, mpfr_rnd_t rnd_mode) -{ - mpfr_long_double_t ld; - mpfr_t tmp; - int inex; - MPFR_SAVE_EXPO_DECL (expo); - - MPFR_SAVE_EXPO_MARK (expo); - - mpfr_init2 (tmp, MPFR_LDBL_MANT_DIG); - inex = mpfr_set (tmp, x, rnd_mode); - - mpfr_set_emin (-16381-63); /* emin=-16444, see below */ - mpfr_set_emax (16384); - mpfr_subnormalize (tmp, mpfr_check_range (tmp, inex, rnd_mode), rnd_mode); - mpfr_prec_round (tmp, 64, MPFR_RNDZ); /* exact */ - if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (tmp))) - ld.ld = (long double) mpfr_get_d (tmp, rnd_mode); - else - { - mp_limb_t *tmpmant; - mpfr_exp_t e, denorm; - - tmpmant = MPFR_MANT (tmp); - e = MPFR_GET_EXP (tmp); - /* The smallest positive normal number is 2^(-16382), which is - 0.5*2^(-16381) in MPFR, thus any exponent <= -16382 corresponds to a - subnormal number. The smallest positive subnormal number is 2^(-16445) - which is 0.5*2^(-16444) in MPFR thus 0 <= denorm <= 63. */ - denorm = MPFR_UNLIKELY (e <= -16382) ? - e - 16382 + 1 : 0; - MPFR_ASSERTD (0 <= denorm && denorm < 64); -#if GMP_NUMB_BITS >= 64 - ld.s.manl = (tmpmant[0] >> denorm); - ld.s.manh = (tmpmant[0] >> denorm) >> 32; -#elif GMP_NUMB_BITS == 32 - if (MPFR_LIKELY (denorm == 0)) - { - ld.s.manl = tmpmant[0]; - ld.s.manh = tmpmant[1]; - } - else if (denorm < 32) - { - ld.s.manl = (tmpmant[0] >> denorm) | (tmpmant[1] << (32 - denorm)); - ld.s.manh = tmpmant[1] >> denorm; - } - else /* 32 <= denorm < 64 */ - { - ld.s.manl = tmpmant[1] >> (denorm - 32); - ld.s.manh = 0; - } -#elif GMP_NUMB_BITS == 16 - if (MPFR_LIKELY (denorm == 0)) - { - /* manl = tmpmant[1] | tmpmant[0] - manh = tmpmant[3] | tmpmant[2] */ - ld.s.manl = tmpmant[0] | ((unsigned long) tmpmant[1] << 16); - ld.s.manh = tmpmant[2] | ((unsigned long) tmpmant[3] << 16); - } - else if (denorm < 16) - { - /* manl = low(mant[2],denorm) | mant[1] | high(mant[0],16-denorm) - manh = mant[3] | high(mant[2],16-denorm) */ - ld.s.manl = (tmpmant[0] >> denorm) - | ((unsigned long) tmpmant[1] << (16 - denorm)) - | ((unsigned long) tmpmant[2] << (32 - denorm)); - ld.s.manh = (tmpmant[2] >> denorm) - | ((unsigned long) tmpmant[3] << (16 - denorm)); - } - else if (denorm == 16) - { - /* manl = tmpmant[2] | tmpmant[1] - manh = 0000000000 | tmpmant[3] */ - ld.s.manl = tmpmant[1] | ((unsigned long) tmpmant[2] << 16); - ld.s.manh = tmpmant[3]; - } - else if (denorm < 32) - { - /* manl = low(mant[3],denorm-16) | mant[2] | high(mant[1],32-denorm) - manh = high(mant[3],32-denorm) */ - ld.s.manl = (tmpmant[1] >> (denorm - 16)) - | ((unsigned long) tmpmant[2] << (32 - denorm)) - | ((unsigned long) tmpmant[3] << (48 - denorm)); - ld.s.manh = tmpmant[3] >> (denorm - 16); - } - else if (denorm == 32) - { - /* manl = tmpmant[3] | tmpmant[2] - manh = 0 */ - ld.s.manl = tmpmant[2] | ((unsigned long) tmpmant[3] << 16); - ld.s.manh = 0; - } - else if (denorm < 48) - { - /* manl = zero(denorm-32) | tmpmant[3] | high(tmpmant[2],48-denorm) - manh = 0 */ - ld.s.manl = (tmpmant[2] >> (denorm - 32)) - | ((unsigned long) tmpmant[3] << (48 - denorm)); - ld.s.manh = 0; - } - else /* 48 <= denorm < 64 */ - { - /* we assume a right shift of 0 is identity */ - ld.s.manl = tmpmant[3] >> (denorm - 48); - ld.s.manh = 0; - } -#elif GMP_NUMB_BITS == 8 - { - unsigned long long mant = 0; - int i; - for (i = 0; i < 8; i++) - mant |= ((unsigned long) tmpmant[i] << (8*i)); - mant >>= denorm; - ld.s.manl = mant; - ld.s.manh = mant >> 32; - } -#else -# error "GMP_NUMB_BITS must be 16, 32 or >= 64" - /* Other values have never been supported anyway. */ -#endif - if (MPFR_LIKELY (denorm == 0)) - { - ld.s.exph = (e + 0x3FFE) >> 8; - ld.s.expl = (e + 0x3FFE); - } - else - ld.s.exph = ld.s.expl = 0; - ld.s.sign = MPFR_IS_NEG (x); - } - - mpfr_clear (tmp); - MPFR_SAVE_EXPO_FREE (expo); - return ld.ld; -} - -#else - -/* generic code */ -long double -mpfr_get_ld (mpfr_srcptr x, mpfr_rnd_t rnd_mode) -{ - if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (x))) - return (long double) mpfr_get_d (x, rnd_mode); - else /* now x is a normal non-zero number */ - { - long double r; /* result */ - double s; /* part of result */ - MPFR_SAVE_EXPO_DECL (expo); - - MPFR_SAVE_EXPO_MARK (expo); - -#if defined(HAVE_LDOUBLE_MAYBE_DOUBLE_DOUBLE) - if (MPFR_LDBL_MANT_DIG == 106) - { - /* Assume double-double format (as found with the PowerPC ABI). - The generic code below isn't used because numbers with - precision > 106 would not be supported. */ - s = mpfr_get_d (x, MPFR_RNDN); /* high part of x */ - /* Let's first consider special cases separately. The test for - infinity is really needed to avoid a NaN result. The test - for NaN is mainly for optimization. The test for 0 is useful - to get the correct sign (assuming mpfr_get_d supports signed - zeros on the implementation). */ - if (s == 0 || DOUBLE_ISNAN (s) || DOUBLE_ISINF (s)) - r = (long double) s; - else - { - mpfr_t y, z; - - mpfr_init2 (y, mpfr_get_prec (x)); - mpfr_init2 (z, IEEE_DBL_MANT_DIG); /* keep the precision small */ - mpfr_set_d (z, s, MPFR_RNDN); /* exact */ - mpfr_sub (y, x, z, MPFR_RNDN); /* exact */ - /* Add the second part of y (in the correct rounding mode). */ - r = (long double) s + (long double) mpfr_get_d (y, rnd_mode); - mpfr_clear (z); - mpfr_clear (y); - } - } - else -#endif - { - long double m; - mpfr_exp_t sh; /* exponent shift -> x/2^sh is in the double range */ - mpfr_t y, z; - int sign; - - /* First round x to the target long double precision, so that - all subsequent operations are exact (this avoids double rounding - problems). However if the format contains numbers that have more - precision, MPFR won't be able to generate such numbers. */ - mpfr_init2 (y, MPFR_LDBL_MANT_DIG); - mpfr_init2 (z, MPFR_LDBL_MANT_DIG); - /* Note about the precision of z: even though IEEE_DBL_MANT_DIG is - sufficient, z has been set to the same precision as y so that - the mpfr_sub below calls mpfr_sub1sp, which is faster than the - generic subtraction, even in this particular case (from tests - done by Patrick Pelissier on a 64-bit Core2 Duo against r7285). - But here there is an important cancellation in the subtraction. - TODO: get more information about what has been tested. */ - - mpfr_set (y, x, rnd_mode); - sh = MPFR_GET_EXP (y); - sign = MPFR_SIGN (y); - MPFR_SET_EXP (y, 0); - MPFR_SET_POS (y); - - r = 0.0; - do - { - s = mpfr_get_d (y, MPFR_RNDN); /* high part of y */ - r += (long double) s; - mpfr_set_d (z, s, MPFR_RNDN); /* exact */ - mpfr_sub (y, y, z, MPFR_RNDN); /* exact */ - } - while (!MPFR_IS_ZERO (y)); - - mpfr_clear (z); - mpfr_clear (y); - - /* we now have to multiply back by 2^sh */ - MPFR_ASSERTD (r > 0); - if (sh != 0) - { - /* An overflow may occur (example: 0.5*2^1024) */ - while (r < 1.0) - { - r += r; - sh--; - } - - if (sh > 0) - m = 2.0; - else - { - m = 0.5; - sh = -sh; - } - - for (;;) - { - if (sh % 2) - r = r * m; - sh >>= 1; - if (sh == 0) - break; - m = m * m; - } - } - if (sign < 0) - r = -r; - } - MPFR_SAVE_EXPO_FREE (expo); - return r; - } -} - -#endif - -/* contributed by Damien Stehle */ -long double -mpfr_get_ld_2exp (long *expptr, mpfr_srcptr src, mpfr_rnd_t rnd_mode) -{ - long double ret; - mpfr_exp_t exp; - mpfr_t tmp; - - if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (src))) - return (long double) mpfr_get_d_2exp (expptr, src, rnd_mode); - - MPFR_ALIAS (tmp, src, MPFR_SIGN (src), 0); - ret = mpfr_get_ld (tmp, rnd_mode); - - exp = MPFR_GET_EXP (src); - - /* rounding can give 1.0, adjust back to 0.5 <= abs(ret) < 1.0 */ - if (ret == 1.0) - { - ret = 0.5; - exp ++; - } - else if (ret == -1.0) - { - ret = -0.5; - exp ++; - } - - MPFR_ASSERTN ((ret >= 0.5 && ret < 1.0) - || (ret <= -0.5 && ret > -1.0)); - MPFR_ASSERTN (exp >= LONG_MIN && exp <= LONG_MAX); - - *expptr = exp; - return ret; -} |