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1 | /* Copyright (C) 1995-2019 Free Software Foundation, Inc. | |
2 | This file is part of the GNU C Library. | |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
15 | License along with the GNU C Library; if not, see | |
16 | <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include "gmp.h" | |
19 | #include "gmp-impl.h" | |
20 | #include <ieee754.h> | |
21 | #include <float.h> | |
22 | ||
23 | /* Convert a multi-precision integer of the needed number of bits (24 for | |
24 | float) and an integral power of two to a `float' in IEEE754 single- | |
25 | precision format. */ | |
26 | ||
27 | float | |
28 | __mpn_construct_float (mp_srcptr frac_ptr, int expt, int sign) | |
29 | { | |
30 | union ieee754_float u; | |
31 | ||
32 | u.ieee.negative = sign; | |
33 | u.ieee.exponent = expt + IEEE754_FLOAT_BIAS; | |
34 | #if BITS_PER_MP_LIMB > FLT_MANT_DIG | |
35 | u.ieee.mantissa = frac_ptr[0] & (((mp_limb_t) 1 << FLT_MANT_DIG) - 1); | |
36 | #else | |
37 | #error "mp_limb size " BITS_PER_MP_LIMB "not accounted for" | |
38 | #endif | |
39 | ||
40 | return u.f; | |
41 | } |