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annotate libquadmath/math/frexpq.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 04ced10e8804
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rev   line source
68
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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1 /* s_frexpl.c -- long double version of s_frexp.c.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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2 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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3 */
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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 /*
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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6 * ====================================================
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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8 *
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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9 * Developed at SunPro, a Sun Microsystems, Inc. business.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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10 * Permission to use, copy, modify, and distribute this
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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11 * software is freely granted, provided that this notice
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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12 * is preserved.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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13 * ====================================================
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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
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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16 /*
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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17 * for non-zero x
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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18 * x = frexpq(arg,&exp);
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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19 * return a __float128 fp quantity x such that 0.5 <= |x| <1.0
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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20 * and the corresponding binary exponent "exp". That is
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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21 * arg = x*2^exp.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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22 * If arg is inf, 0.0, or NaN, then frexpq(arg,&exp) returns arg
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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23 * with *exp=0.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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24 */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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25
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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26 #include "quadmath-imp.h"
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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27
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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28 static const __float128
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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29 two114 = 2.0769187434139310514121985316880384E+34Q; /* 0x4071000000000000, 0 */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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30
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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31 __float128
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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32 frexpq (__float128 x, int *eptr)
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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 uint64_t hx, lx, ix;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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35 GET_FLT128_WORDS64(hx,lx,x);
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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36 ix = 0x7fffffffffffffffULL&hx;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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37 *eptr = 0;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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38 if(ix>=0x7fff000000000000ULL||((ix|lx)==0)) return x; /* 0,inf,nan */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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39 if (ix<0x0001000000000000ULL) { /* subnormal */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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40 x *= two114;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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41 GET_FLT128_MSW64(hx,x);
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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42 ix = hx&0x7fffffffffffffffULL;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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43 *eptr = -114;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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44 }
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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45 *eptr += (ix>>48)-16382;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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46 hx = (hx&0x8000ffffffffffffULL) | 0x3ffe000000000000ULL;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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47 SET_FLT128_MSW64(x,hx);
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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48 return x;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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49 }