/* 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. * ==================================================== */ #include <sys/cdefs.h> #if defined(LIBM_SCCS) && !defined(lint) __RCSID("$NetBSD: w_expf.c,v 1.7 2007/08/20 16:01:40 drochner Exp $"); #endif /* * wrapper expf(x) */ #include "namespace.h" #include "math.h" #include "math_private.h" #ifdef __weak_alias __weak_alias(expf, _expf) #endif static const float o_threshold= 8.8721679688e+01, /* 0x42b17180 */ u_threshold= -1.0397208405e+02; /* 0xc2cff1b5 */ float expf(float x) /* wrapper expf */ { #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 } |