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annotate libquadmath/math/nextafterq.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_nextafterl.c -- long double version of s_nextafter.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 /* IEEE functions
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21 * nextafterq(x,y)
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22 * return the next machine floating-point number of x in the
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23 * direction toward y.
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24 * Special cases:
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25 */
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26
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27 #include "quadmath-imp.h"
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28
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29 __float128 nextafterq(__float128 x, __float128 y)
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30 {
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31 int64_t hx,hy,ix,iy;
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32 uint64_t lx,ly;
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33
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34 GET_FLT128_WORDS64(hx,lx,x);
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35 GET_FLT128_WORDS64(hy,ly,y);
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36 ix = hx&0x7fffffffffffffffLL; /* |x| */
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37 iy = hy&0x7fffffffffffffffLL; /* |y| */
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38
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39 if(((ix>=0x7fff000000000000LL)&&((ix-0x7fff000000000000LL)|lx)!=0) || /* x is nan */
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40 ((iy>=0x7fff000000000000LL)&&((iy-0x7fff000000000000LL)|ly)!=0)) /* y is nan */
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41 return x+y;
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42 if(x==y) return y; /* x=y, return y */
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43 if((ix|lx)==0) { /* x == 0 */
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44 __float128 u;
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45 SET_FLT128_WORDS64(x,hy&0x8000000000000000ULL,1);/* return +-minsubnormal */
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46 u = math_opt_barrier (x);
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47 u = u * u;
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48 math_force_eval (u); /* raise underflow flag */
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49 return x;
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50 }
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51 if(hx>=0) { /* x > 0 */
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52 if(hx>hy||((hx==hy)&&(lx>ly))) { /* x > y, x -= ulp */
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53 if(lx==0) hx--;
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54 lx--;
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55 } else { /* x < y, x += ulp */
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56 lx++;
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57 if(lx==0) hx++;
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58 }
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59 } else { /* x < 0 */
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60 if(hy>=0||hx>hy||((hx==hy)&&(lx>ly))){/* x < y, x -= ulp */
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61 if(lx==0) hx--;
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62 lx--;
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63 } else { /* x > y, x += ulp */
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64 lx++;
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65 if(lx==0) hx++;
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66 }
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67 }
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68 hy = hx&0x7fff000000000000LL;
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69 if(hy==0x7fff000000000000LL) {
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70 __float128 u = x + x; /* overflow */
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71 math_force_eval (u);
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72 errno = ERANGE;
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73 }
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74 if(hy==0) {
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75 __float128 u = x*x; /* underflow */
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76 math_force_eval (u); /* raise underflow flag */
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77 errno = ERANGE;
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78 }
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79 SET_FLT128_WORDS64(x,hx,lx);
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80 return x;
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81 }