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annotate libquadmath/math/modfq.c @ 145:1830386684a0

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gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
parents 04ced10e8804
children
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145
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1 /* s_modfl.c -- long double version of s_modf.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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8 *
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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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16 #if defined(LIBM_SCCS) && !defined(lint)
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17 static char rcsid[] = "$NetBSD: $";
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18 #endif
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19
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20 /*
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21 * modfq(long double x, long double *iptr)
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22 * return fraction part of x, and return x's integral part in *iptr.
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23 * Method:
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24 * Bit twiddling.
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25 *
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26 * Exception:
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27 * No exception.
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28 */
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29
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30 #include "quadmath-imp.h"
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31
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32 static const __float128 one = 1.0;
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33
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34 __float128 modfq(__float128 x, __float128 *iptr)
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35 {
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36 int64_t i0,i1,j0;
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37 uint64_t i;
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38 GET_FLT128_WORDS64(i0,i1,x);
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39 j0 = ((i0>>48)&0x7fff)-0x3fff; /* exponent of x */
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40 if(j0<48) { /* integer part in high x */
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41 if(j0<0) { /* |x|<1 */
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42 /* *iptr = +-0 */
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43 SET_FLT128_WORDS64(*iptr,i0&0x8000000000000000ULL,0);
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44 return x;
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45 } else {
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46 i = (0x0000ffffffffffffLL)>>j0;
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47 if(((i0&i)|i1)==0) { /* x is integral */
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48 *iptr = x;
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49 /* return +-0 */
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50 SET_FLT128_WORDS64(x,i0&0x8000000000000000ULL,0);
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51 return x;
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52 } else {
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53 SET_FLT128_WORDS64(*iptr,i0&(~i),0);
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54 return x - *iptr;
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55 }
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56 }
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57 } else if (j0>111) { /* no fraction part */
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58 *iptr = x*one;
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59 /* We must handle NaNs separately. */
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60 if (j0 == 0x4000 && ((i0 & 0x0000ffffffffffffLL) | i1))
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61 return x*one;
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62 /* return +-0 */
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63 SET_FLT128_WORDS64(x,i0&0x8000000000000000ULL,0);
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64 return x;
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65 } else { /* fraction part in low x */
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66 i = -1ULL>>(j0-48);
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67 if((i1&i)==0) { /* x is integral */
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68 *iptr = x;
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69 /* return +-0 */
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70 SET_FLT128_WORDS64(x,i0&0x8000000000000000ULL,0);
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71 return x;
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72 } else {
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73 SET_FLT128_WORDS64(*iptr,i0,i1&(~i));
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74 return x - *iptr;
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75 }
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76 }
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77 }