diff options
Diffstat (limited to 'sysdeps/libm-ieee754/w_expf.c')
| -rw-r--r-- | sysdeps/libm-ieee754/w_expf.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/w_expf.c b/sysdeps/libm-ieee754/w_expf.c new file mode 100644 index 0000000000..ad38fac0f3 --- /dev/null +++ b/sysdeps/libm-ieee754/w_expf.c @@ -0,0 +1,59 @@ +/* w_expf.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. + * ==================================================== + */ + +#if defined(LIBM_SCCS) && !defined(lint) +static char rcsid[] = "$NetBSD: w_expf.c,v 1.3 1995/05/10 20:48:53 jtc Exp $"; +#endif + +/* + * wrapper expf(x) + */ + +#include "math.h" +#include "math_private.h" + +#ifdef __STDC__ +static const float +#else +static float +#endif +o_threshold= 8.8721679688e+01, /* 0x42b17180 */ +u_threshold= -1.0397208405e+02; /* 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) + /* exp overflow */ + return (float)__kernel_standard((double)x,(double)x,106); + else if(x<u_threshold) + /* exp underflow */ + return (float)__kernel_standard((double)x,(double)x,107); + } + return z; +#endif +} +weak_alias (__expf, expf) |