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annotate libquadmath/math/nextafterq.c @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents 561a7518be6b
children 1830386684a0
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rev   line source
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1 /* nextafterq.c -- __float128 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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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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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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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 #include <errno.h>
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17 #include "quadmath-imp.h"
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18
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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19 __float128
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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20 nextafterq (__float128 x, __float128 y)
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21 {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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22 int64_t hx,hy,ix,iy;
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23 uint64_t lx,ly;
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24
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25 GET_FLT128_WORDS64(hx,lx,x);
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26 GET_FLT128_WORDS64(hy,ly,y);
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27 ix = hx&0x7fffffffffffffffLL; /* |x| */
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28 iy = hy&0x7fffffffffffffffLL; /* |y| */
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29
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30 if(((ix>=0x7fff000000000000LL)&&((ix-0x7fff000000000000LL)|lx)!=0) || /* x is nan */
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31 ((iy>=0x7fff000000000000LL)&&((iy-0x7fff000000000000LL)|ly)!=0)) /* y is nan */
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32 return x+y;
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33 if(x==y) return y; /* x=y, return y */
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34 if((ix|lx)==0) { /* x == 0 */
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35 SET_FLT128_WORDS64(x,hy&0x8000000000000000ULL,1);/* return +-minsubnormal */
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36
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37 /* here we should raise an underflow flag */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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38 return x;
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39 }
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40 if(hx>=0) { /* x > 0 */
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41 if(hx>hy||((hx==hy)&&(lx>ly))) { /* x > y, x -= ulp */
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42 if(lx==0) hx--;
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43 lx--;
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44 } else { /* x < y, x += ulp */
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45 lx++;
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46 if(lx==0) hx++;
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47 }
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48 } else { /* x < 0 */
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49 if(hy>=0||hx>hy||((hx==hy)&&(lx>ly))){/* x < y, x -= ulp */
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50 if(lx==0) hx--;
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51 lx--;
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52 } else { /* x > y, x += ulp */
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53 lx++;
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54 if(lx==0) hx++;
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55 }
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56 }
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57 hy = hx&0x7fff000000000000LL;
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58 if(hy==0x7fff000000000000LL) {
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59 __float128 u = x + x; /* overflow */
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60 math_force_eval (u);
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61 errno = ERANGE;
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62 }
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63 if(hy==0) {
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64 __float128 u = x*x; /* underflow */
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65 math_force_eval (u); /* raise underflow flag */
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66 errno = ERANGE;
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67 }
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68 SET_FLT128_WORDS64(x,hx,lx);
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69 return x;
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70 }