| /* 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= 8.8722831726e+01, /* 0x42b17217 */ |
| 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 |
| } |
| hidden_def (__expf) |
| weak_alias (__expf, expf) |
