74 lines
1.4 KiB
C
74 lines
1.4 KiB
C
/* wf_exp.c -- float version of w_exp.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.
|
|
* ====================================================
|
|
*/
|
|
|
|
/*
|
|
* wrapper expf(x)
|
|
*/
|
|
|
|
#include "fdlibm.h"
|
|
#if __OBSOLETE_MATH
|
|
#include <errno.h>
|
|
|
|
#ifdef __STDC__
|
|
static const float
|
|
#else
|
|
static float
|
|
#endif
|
|
o_threshold= 0x1.62e42ep+06, /* 0x42b17217 */
|
|
u_threshold= -0x1.9fe36ap+06; /* 0xc2cff1b5 */
|
|
|
|
#ifdef __STDC__
|
|
float expf(float x) /* wrapper expf */
|
|
#else
|
|
float expf(x) /* wrapper expf */
|
|
float x;
|
|
#endif
|
|
{
|
|
#ifdef _IEEE_LIBM
|
|
return __ieee754_expf(x);
|
|
#else
|
|
float z;
|
|
z = __ieee754_expf(x);
|
|
if(_LIB_VERSION == _IEEE_) return z;
|
|
if(finitef(x)) {
|
|
if(x>o_threshold) {
|
|
/* expf(finite) overflow */
|
|
errno = ERANGE;
|
|
return HUGE_VALF;
|
|
} else if(x<u_threshold) {
|
|
/* expf(finite) underflow */
|
|
errno = ERANGE;
|
|
return 0.0f;
|
|
}
|
|
}
|
|
return z;
|
|
#endif
|
|
}
|
|
|
|
#ifdef _DOUBLE_IS_32BITS
|
|
|
|
#ifdef __STDC__
|
|
double exp(double x)
|
|
#else
|
|
double exp(x)
|
|
double x;
|
|
#endif
|
|
{
|
|
return (double) expf((float) x);
|
|
}
|
|
|
|
#endif /* defined(_DOUBLE_IS_32BITS) */
|
|
#endif /* __OBSOLETE_MATH */
|