47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/* e_scalbf.c -- float version of e_scalb.c.
|
|
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@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.
|
|
* ====================================================
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#if defined(LIBM_SCCS) && !defined(lint)
|
|
__RCSID("$NetBSD: e_scalbf.c,v 1.7 2010/04/23 19:17:07 drochner Exp $");
|
|
#endif
|
|
|
|
#include "namespace.h"
|
|
#include "math.h"
|
|
#include "math_private.h"
|
|
|
|
#ifdef _SCALB_INT
|
|
float
|
|
__ieee754_scalbf(float x, int fn)
|
|
#else
|
|
float
|
|
__ieee754_scalbf(float x, float fn)
|
|
#endif
|
|
{
|
|
#ifdef _SCALB_INT
|
|
return scalbnf(x,fn);
|
|
#else
|
|
if (isnanf(x)||isnanf(fn)) return x*fn;
|
|
if (!finitef(fn)) {
|
|
if(fn>(float)0.0) return x*fn;
|
|
else return x/(-fn);
|
|
}
|
|
if (rintf(fn)!=fn) return (fn-fn)/(fn-fn);
|
|
if ( fn > (float)65000.0) return scalbnf(x, 65000);
|
|
if (-fn > (float)65000.0) return scalbnf(x,-65000);
|
|
return scalbnf(x,(int)fn);
|
|
#endif
|
|
}
|