mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/* 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 <fenv.h>
|
|
#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))
|
|
{
|
|
# ifdef FE_INVALID
|
|
feraiseexcept (FE_INVALID);
|
|
# endif
|
|
return __nanl ("");
|
|
}
|
|
else return x/(-fn);
|
|
}
|
|
if (__rintl(fn)!=fn)
|
|
{
|
|
# ifdef FE_INVALID
|
|
feraiseexcept (FE_INVALID);
|
|
# endif
|
|
return __nanl ("");
|
|
}
|
|
if ( fn > 65000.0) return __scalbnl(x, 65000);
|
|
if (-fn > 65000.0) return __scalbnl(x,-65000);
|
|
return __scalbnl(x,(int)fn);
|
|
#endif
|
|
}
|