51 lines
1.8 KiB
C
51 lines
1.8 KiB
C
/* Copyright (C) 1995-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <config.h>
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#include <float.h>
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#include <math.h>
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#include "../printf/gmp-impl.h"
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/* Convert a multi-precision integer of the needed number of bits (113 for
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long double) and an integral power of two to a `long double' in IEEE854
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quad-precision format. */
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__float128
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mpn_construct_float128 (mp_srcptr frac_ptr, int expt, int sign)
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{
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ieee854_float128 u;
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u.ieee.negative = sign;
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u.ieee.exponent = expt + IEEE854_FLOAT128_BIAS;
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#if BITS_PER_MP_LIMB == 32
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u.ieee.mant_low = (((uint64_t) frac_ptr[1]) << 32)
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| (frac_ptr[0] & 0xffffffff);
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u.ieee.mant_high = (((uint64_t) frac_ptr[3]
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& (((mp_limb_t) 1 << (FLT128_MANT_DIG - 96)) - 1))
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<< 32) | (frac_ptr[2] & 0xffffffff);
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#elif BITS_PER_MP_LIMB == 64
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u.ieee.mant_low = frac_ptr[0];
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u.ieee.mant_high = frac_ptr[1]
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& (((mp_limb_t) 1 << (FLT128_MANT_DIG - 64)) - 1);
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#else
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#error "mp_limb size " BITS_PER_MP_LIMB "not accounted for"
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#endif
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return u.value;
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}
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