diff options
Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/set_uj.c')
-rw-r--r-- | Build/source/libs/mpfr/mpfr-src/src/set_uj.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/Build/source/libs/mpfr/mpfr-src/src/set_uj.c b/Build/source/libs/mpfr/mpfr-src/src/set_uj.c new file mode 100644 index 00000000000..a1f679aea02 --- /dev/null +++ b/Build/source/libs/mpfr/mpfr-src/src/set_uj.c @@ -0,0 +1,123 @@ +/* mpfr_set_uj -- set a MPFR number from a huge machine unsigned integer + +Copyright 2004-2015 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. */ + +#ifdef HAVE_CONFIG_H +# include "config.h" /* for a build within gmp */ +#endif + +#define MPFR_NEED_LONGLONG_H +#include "mpfr-intmax.h" +#include "mpfr-impl.h" + +#ifdef _MPFR_H_HAVE_INTMAX_T + +int +mpfr_set_uj (mpfr_t x, uintmax_t j, mpfr_rnd_t rnd) +{ + return mpfr_set_uj_2exp (x, j, 0, rnd); +} + +int +mpfr_set_uj_2exp (mpfr_t x, uintmax_t j, intmax_t e, mpfr_rnd_t rnd) +{ + unsigned int cnt, i; + mp_size_t k, len; + mp_limb_t limb; + mp_limb_t yp[sizeof(uintmax_t) / sizeof(mp_limb_t)]; + mpfr_t y; + unsigned long uintmax_bit_size = sizeof(uintmax_t) * CHAR_BIT; + unsigned long bpml = GMP_NUMB_BITS % uintmax_bit_size; + + /* Special case */ + if (j == 0) + { + MPFR_SET_POS(x); + MPFR_SET_ZERO(x); + MPFR_RET(0); + } + + MPFR_ASSERTN (sizeof(uintmax_t) % sizeof(mp_limb_t) == 0); + + /* Create an auxillary var */ + MPFR_TMP_INIT1 (yp, y, uintmax_bit_size); + k = numberof (yp); + if (k == 1) + limb = yp[0] = j; + else + { + /* Note: either GMP_NUMB_BITS = uintmax_bit_size, then k = 1 the + shift j >>= bpml is never done, or GMP_NUMB_BITS < uintmax_bit_size + and bpml = GMP_NUMB_BITS. */ + for (i = 0; i < k; i++, j >>= bpml) + yp[i] = j; /* Only the low bits are copied */ + + /* Find the first limb not equal to zero. */ + do + { + MPFR_ASSERTD (k > 0); + limb = yp[--k]; + } + while (limb == 0); + k++; + } + count_leading_zeros(cnt, limb); + len = numberof (yp) - k; + + /* Normalize it: len = number of last 0 limb, k number of non-zero limbs */ + if (MPFR_LIKELY(cnt)) + mpn_lshift (yp+len, yp, k, cnt); /* Normalize the High Limb*/ + else if (len != 0) + MPN_COPY_DECR (yp+len, yp, k); /* Must use DECR */ + if (len != 0) + /* Note: when numberof(yp)==1, len is constant and null, so the compiler + can optimize out this code. */ + { + if (len == 1) + yp[0] = (mp_limb_t) 0; + else + MPN_ZERO (yp, len); /* Zeroing the last limbs */ + } + e += k * GMP_NUMB_BITS - cnt; /* Update Expo */ + MPFR_ASSERTD (MPFR_LIMB_MSB(yp[numberof (yp) - 1]) != 0); + + /* Check expo underflow / overflow (can't use mpfr_check_range) */ + if (MPFR_UNLIKELY(e < __gmpfr_emin)) + { + /* The following test is necessary because in the rounding to the + * nearest mode, mpfr_underflow always rounds away from 0. In + * this rounding mode, we need to round to 0 if: + * _ |x| < 2^(emin-2), or + * _ |x| = 2^(emin-2) and the absolute value of the exact + * result is <= 2^(emin-2). */ + if (rnd == MPFR_RNDN && (e+1 < __gmpfr_emin || mpfr_powerof2_raw(y))) + rnd = MPFR_RNDZ; + return mpfr_underflow (x, rnd, MPFR_SIGN_POS); + } + if (MPFR_UNLIKELY(e > __gmpfr_emax)) + return mpfr_overflow (x, rnd, MPFR_SIGN_POS); + MPFR_SET_EXP (y, e); + + /* Final: set x to y (rounding if necessary) */ + return mpfr_set (x, y, rnd); +} + +#endif |