blob: e9bbc490ad52114f9c965730c648a99c32a375f6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
/* Copyright (C) 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include "gmp.h"
#include "gmp-impl.h"
#include "ieee754.h"
#include <float.h>
/* Convert a multi-precision integer of the needed number of bits (24 for
float) and an integral power of two to a `float' in IEEE754 single-
precision format. */
float
__mpn_construct_float (mp_srcptr frac_ptr, int expt, int sign)
{
union ieee754_float u;
u.ieee.negative = sign;
u.ieee.exponent = expt + IEEE754_FLOAT_BIAS;
#if BITS_PER_MP_LIMB > FLT_MANT_DIG
u.ieee.mantissa = frac_ptr[0] & ((1 << FLT_MANT_DIG) - 1);
#else
#error "mp_limb size " BITS_PER_MP_LIMB "not accounted for"
#endif
return u.f;
}
|
