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glibc/sysdeps/generic/e_scalbf.c
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/* 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. | |
* ==================================================== | |
*/ | |
#if defined(LIBM_SCCS) && !defined(lint) | |
static char rcsid[] = "$NetBSD: e_scalbf.c,v 1.3 1995/05/10 20:46:12 jtc Exp $"; | |
#endif | |
#include "math.h" | |
#include "math_private.h" | |
#ifdef _SCALB_INT | |
#ifdef __STDC__ | |
float __ieee754_scalbf(float x, int fn) | |
#else | |
float __ieee754_scalbf(x,fn) | |
float x; int fn; | |
#endif | |
#else | |
#ifdef __STDC__ | |
float __ieee754_scalbf(float x, float fn) | |
#else | |
float __ieee754_scalbf(x,fn) | |
float x, fn; | |
#endif | |
#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 if (x == 0) | |
return x; | |
else if (!__finitef (x)) | |
return __nanf (""); | |
else return x/(-fn); | |
} | |
if (__rintf(fn)!=fn) return __nanf (""); | |
if ( fn > (float)65000.0) return __scalbnf(x, 65000); | |
if (-fn > (float)65000.0) return __scalbnf(x,-65000); | |
return __scalbnf(x,(int)fn); | |
#endif | |
} |