| /* double mpz_get_d_2exp (signed long int *exp, mpz_t src). |
| |
| Copyright 2001, 2003, 2004 Free Software Foundation, Inc. |
| |
| This file is part of the GNU MP Library. |
| |
| The GNU MP 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 MP 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 MP Library. If not, see http://www.gnu.org/licenses/. */ |
| |
| #include "gmp.h" |
| #include "gmp-impl.h" |
| #include "longlong.h" |
| |
| double |
| mpz_get_d_2exp (signed long int *exp2, mpz_srcptr src) |
| { |
| mp_size_t size, abs_size; |
| mp_srcptr ptr; |
| int cnt; |
| long exp; |
| |
| size = SIZ(src); |
| if (UNLIKELY (size == 0)) |
| { |
| *exp2 = 0; |
| return 0.0; |
| } |
| |
| ptr = PTR(src); |
| abs_size = ABS(size); |
| count_leading_zeros (cnt, ptr[abs_size - 1]); |
| exp = abs_size * GMP_NUMB_BITS - (cnt - GMP_NAIL_BITS); |
| *exp2 = exp; |
| return mpn_get_d (ptr, abs_size, size, -exp); |
| } |