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annotate libquadmath/math/ilogbq.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_ilogbl.c -- long double version of s_ilogb.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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15
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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 /* ilogbl(long double x)
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21 * return the binary exponent of non-zero x
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22 * ilogbl(0) = FP_ILOGB0
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23 * ilogbl(NaN) = FP_ILOGBNAN (no signal is raised)
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24 * ilogbl(+-Inf) = INT_MAX (no signal is raised)
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25 */
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26
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27 #include <math.h>
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28 #include "quadmath-imp.h"
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29 #ifndef FP_ILOGB0
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30 # define FP_ILOGB0 INT_MIN
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31 #endif
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32 #ifndef FP_ILOGBNAN
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33 # define FP_ILOGBNAN INT_MAX
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34 #endif
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35
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36 int ilogbq (__float128 x)
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37 {
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38 int64_t hx,lx;
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39 int ix;
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40
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41 GET_FLT128_WORDS64(hx,lx,x);
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42 hx &= 0x7fffffffffffffffLL;
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43 if(hx <= 0x0001000000000000LL) {
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44 if((hx|lx)==0)
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45 { errno = EDOM; feraiseexcept (FE_INVALID); return FP_ILOGB0; } /* ilogbl(0) = FP_ILOGB0 */
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46 else /* subnormal x */
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47 if(hx==0) {
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48 for (ix = -16431; lx>0; lx<<=1) ix -=1;
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49 } else {
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50 for (ix = -16382, hx<<=15; hx>0; hx<<=1) ix -=1;
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51 }
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52 return ix;
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53 }
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54 else if (hx<0x7fff000000000000LL) return (hx>>48)-0x3fff;
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55 else if (FP_ILOGBNAN != INT_MAX) {
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56 /* ISO C99 requires ilogbl(+-Inf) == INT_MAX. */
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57 if (((hx^0x7fff000000000000LL)|lx) == 0)
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58 { errno = EDOM; feraiseexcept (FE_INVALID); return INT_MAX; }
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59 }
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60 { errno = EDOM; feraiseexcept (FE_INVALID); return FP_ILOGBNAN; }
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61 }