mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/* @(#)e_scalb.c 5.1 93/09/24 */
|
|
/*
|
|
* ====================================================
|
|
* 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: e_scalb.c,v 1.6 1995/05/10 20:46:09 jtc Exp $";
|
|
#endif
|
|
|
|
/*
|
|
* __ieee754_scalb(x, fn) is provide for
|
|
* passing various standard test suite. One
|
|
* should use scalbn() instead.
|
|
*/
|
|
|
|
#include <fenv.h>
|
|
#include <math.h>
|
|
#include "math_private.h"
|
|
|
|
#ifdef _SCALB_INT
|
|
#ifdef __STDC__
|
|
double __ieee754_scalb(double x, int fn)
|
|
#else
|
|
double __ieee754_scalb(x,fn)
|
|
double x; int fn;
|
|
#endif
|
|
#else
|
|
#ifdef __STDC__
|
|
double __ieee754_scalb(double x, double fn)
|
|
#else
|
|
double __ieee754_scalb(x,fn)
|
|
double x, fn;
|
|
#endif
|
|
#endif
|
|
{
|
|
#ifdef _SCALB_INT
|
|
return __scalbn(x,fn);
|
|
#else
|
|
if (__isnan(x)||__isnan(fn)) return x*fn;
|
|
if (!__finite(fn)) {
|
|
if(fn>0.0) return x*fn;
|
|
else if (x == 0)
|
|
return x;
|
|
else if (!__finite (x))
|
|
{
|
|
# ifdef FE_INVALID
|
|
feraiseexcept (FE_INVALID);
|
|
# endif
|
|
return __nan ("");
|
|
}
|
|
else return x/(-fn);
|
|
}
|
|
if (__rint(fn)!=fn)
|
|
{
|
|
# ifdef FE_INVALID
|
|
feraiseexcept (FE_INVALID);
|
|
# endif
|
|
return __nan ("");
|
|
}
|
|
if ( fn > 65000.0) return __scalbn(x, 65000);
|
|
if (-fn > 65000.0) return __scalbn(x,-65000);
|
|
return __scalbn(x,(int)fn);
|
|
#endif
|
|
}
|