mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-24 23:32:06 +00:00
56 lines
1.2 KiB
C
56 lines
1.2 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.
|
|
* ====================================================
|
|
*/
|
|
|
|
/*
|
|
* __ieee754_scalb(x, fn) is provide for
|
|
* passing various standard test suite. One
|
|
* should use scalbn() instead.
|
|
*/
|
|
|
|
#include "fdlibm.h"
|
|
|
|
#ifndef _DOUBLE_IS_32BITS
|
|
|
|
#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 return x/(-fn);
|
|
}
|
|
if (rint(fn)!=fn) return (fn-fn)/(fn-fn);
|
|
if ( fn > 65000.0) return scalbn(x, 65000);
|
|
if (-fn > 65000.0) return scalbn(x,-65000);
|
|
return scalbn(x,(int)fn);
|
|
#endif
|
|
}
|
|
|
|
#endif /* defined(_DOUBLE_IS_32BITS) */
|