| /* s_frexpl.c -- long double version of s_frexp.c. |
| * Conversion to long double by Ulrich Drepper, |
| * Cygnus Support, drepper@cygnus.com. |
| */ |
| |
| /* |
| * ==================================================== |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| * |
| * Developed at SunPro, a Sun Microsystems, Inc. business. |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| */ |
| |
| #if defined(LIBM_SCCS) && !defined(lint) |
| static char rcsid[] = "$NetBSD: $"; |
| #endif |
| |
| /* |
| * for non-zero x |
| * x = frexpl(arg,&exp); |
| * return a long double fp quantity x such that 0.5 <= |x| <1.0 |
| * and the corresponding binary exponent "exp". That is |
| * arg = x*2^exp. |
| * If arg is inf, 0.0, or NaN, then frexpl(arg,&exp) returns arg |
| * with *exp=0. |
| */ |
| |
| #include <float.h> |
| #include <math.h> |
| #include <math_private.h> |
| |
| static const long double |
| #if LDBL_MANT_DIG == 64 |
| two65 = 3.68934881474191032320e+19L; /* 0x4040, 0x80000000, 0x00000000 */ |
| #else |
| # error "Cannot handle this MANT_DIG" |
| #endif |
| |
| |
| long double __frexpl(long double x, int *eptr) |
| { |
| u_int32_t se, hx, ix, lx; |
| GET_LDOUBLE_WORDS(se,hx,lx,x); |
| ix = 0x7fff&se; |
| *eptr = 0; |
| if(ix==0x7fff||((ix|hx|lx)==0)) return x; /* 0,inf,nan */ |
| if (ix==0x0000) { /* subnormal */ |
| x *= two65; |
| GET_LDOUBLE_EXP(se,x); |
| ix = se&0x7fff; |
| *eptr = -65; |
| } |
| *eptr += ix-16382; |
| se = (se & 0x8000) | 0x3ffe; |
| SET_LDOUBLE_EXP(x,se); |
| return x; |
| } |
| weak_alias (__frexpl, frexpl) |
