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glibc/sysdeps/generic/e_scalbl.c
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/* e_scalbl.c -- long double version of s_scalb.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 | |
/* | |
* __ieee754_scalbl(x, fn) is provide for | |
* passing various standard test suite. One | |
* should use scalbnl() instead. | |
*/ | |
#include "math.h" | |
#include "math_private.h" | |
#ifdef _SCALB_INT | |
#ifdef __STDC__ | |
long double __ieee754_scalbl(long double x, int fn) | |
#else | |
long double __ieee754_scalbl(x,fn) | |
long double x; int fn; | |
#endif | |
#else | |
#ifdef __STDC__ | |
long double __ieee754_scalbl(long double x, long double fn) | |
#else | |
long double __ieee754_scalbl(x,fn) | |
long double x, fn; | |
#endif | |
#endif | |
{ | |
#ifdef _SCALB_INT | |
return __scalbnl(x,fn); | |
#else | |
if (__isnanl(x)||__isnanl(fn)) return x*fn; | |
if (!__finitel(fn)) { | |
if(fn>0.0) return x*fn; | |
else if (x == 0) | |
return x; | |
else if (!__finitel (x)) | |
return __nanl (""); | |
else return x/(-fn); | |
} | |
if (__rintl(fn)!=fn) return __nanl (""); | |
if ( fn > 65000.0) return __scalbnl(x, 65000); | |
if (-fn > 65000.0) return __scalbnl(x,-65000); | |
return __scalbnl(x,(int)fn); | |
#endif | |
} |