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annotate libquadmath/math/nearbyintq.c @ 158:494b0b89df80 default tip

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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 25 May 2020 18:13:55 +0900
parents 1830386684a0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* s_nearbyintl.c -- long double version of s_nearbyint.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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3 */
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4
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5 /*
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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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10 * Permission to use, copy, modify, and distribute this
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11 * software is freely granted, provided that this notice
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12 * is preserved.
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13 * ====================================================
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14 */
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15
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16 /*
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17 * nearbyintq(x)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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18 * Return x rounded to integral value according to the prevailing
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19 * rounding mode.
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20 * Method:
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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21 * Using floating addition.
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22 * Exception:
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23 * Inexact flag raised if x not equal to rintq(x).
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24 */
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25
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26 #include "quadmath-imp.h"
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27
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28 static const __float128
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29 TWO112[2]={
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30 5.19229685853482762853049632922009600E+33Q, /* 0x406F000000000000, 0 */
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31 -5.19229685853482762853049632922009600E+33Q /* 0xC06F000000000000, 0 */
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32 };
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33
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34 __float128 nearbyintq(__float128 x)
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35 {
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36 fenv_t env;
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37 int64_t i0,j0,sx;
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38 uint64_t i1 __attribute__ ((unused));
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39 __float128 w,t;
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40 GET_FLT128_WORDS64(i0,i1,x);
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41 sx = (((uint64_t)i0)>>63);
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42 j0 = ((i0>>48)&0x7fff)-0x3fff;
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43 if(j0<112) {
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44 if(j0<0) {
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45 feholdexcept (&env);
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46 w = TWO112[sx] + math_opt_barrier (x);
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47 t = w-TWO112[sx];
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48 math_force_eval (t);
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49 fesetenv (&env);
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50 GET_FLT128_MSW64(i0,t);
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51 SET_FLT128_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63));
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52 return t;
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53 }
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54 } else {
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55 if(j0==0x4000) return x+x; /* inf or NaN */
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56 else return x; /* x is integral */
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57 }
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58 feholdexcept (&env);
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59 w = TWO112[sx] + math_opt_barrier (x);
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60 t = w-TWO112[sx];
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61 math_force_eval (t);
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62 fesetenv (&env);
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63 return t;
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64 }