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annotate libquadmath/strtod/mpn2flt128.c @ 68:561a7518be6b

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update gcc-4.6
author Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
date Sun, 21 Aug 2011 07:07:55 +0900
parents
children 1830386684a0
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rev   line source
68
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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1 /* Copyright (C) 1995,1996,1997,1998,1999,2002,2003
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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2 Free Software Foundation, Inc.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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3 This file is part of the GNU C Library.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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4
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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5 The GNU C Library is free software; you can redistribute it and/or
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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6 modify it under the terms of the GNU Lesser General Public
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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7 License as published by the Free Software Foundation; either
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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8 version 2.1 of the License, or (at your option) any later version.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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9
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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10 The GNU C Library is distributed in the hope that it will be useful,
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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13 Lesser General Public License for more details.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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14
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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15 You should have received a copy of the GNU Lesser General Public
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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16 License along with the GNU C Library; if not, write to the Free
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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18 02111-1307 USA. */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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19
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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20 #include <config.h>
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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21 #include <float.h>
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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22 #include <math.h>
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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23 #include "../printf/gmp-impl.h"
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24
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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25 /* Convert a multi-precision integer of the needed number of bits (113 for
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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26 long double) and an integral power of two to a `long double' in IEEE854
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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27 quad-precision format. */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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28
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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29 __float128
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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30 mpn_construct_float128 (mp_srcptr frac_ptr, int expt, int sign)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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31 {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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32 ieee854_float128 u;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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33
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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34 u.ieee.negative = sign;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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35 u.ieee.exponent = expt + IEEE854_FLOAT128_BIAS;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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36 #if BITS_PER_MP_LIMB == 32
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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37 u.ieee.mant_low = (((uint64_t) frac_ptr[1]) << 32)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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38 | (frac_ptr[0] & 0xffffffff);
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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39 u.ieee.mant_high = (((uint64_t) frac_ptr[3]
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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40 & (((mp_limb_t) 1 << (FLT128_MANT_DIG - 96)) - 1))
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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41 << 32) | (frac_ptr[2] & 0xffffffff);
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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42 #elif BITS_PER_MP_LIMB == 64
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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43 u.ieee.mant_low = frac_ptr[0];
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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44 u.ieee.mant_high = frac_ptr[1]
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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45 & (((mp_limb_t) 1 << (FLT128_MANT_DIG - 64)) - 1);
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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46 #else
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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47 #error "mp_limb size " BITS_PER_MP_LIMB "not accounted for"
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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48 #endif
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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49
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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50 return u.value;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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51 }