mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-18 11:00:07 +00:00
43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
/* 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;
|
|
}
|