| /* @(#)w_exp.c 5.1 93/09/24 */ |
| /* |
| * ==================================================== |
| * 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_exp.c,v 1.6 1995/05/10 20:48:51 jtc Exp $"; |
| #endif |
| |
| /* |
| * wrapper exp(x) |
| */ |
| |
| #include "math.h" |
| #include "math_private.h" |
| |
| #ifdef __STDC__ |
| static const double |
| #else |
| static double |
| #endif |
| o_threshold= 7.09782712893383973096e+02, /* 0x40862E42, 0xFEFA39EF */ |
| u_threshold= -7.45133219101941108420e+02; /* 0xc0874910, 0xD52D3051 */ |
| |
| #ifdef __STDC__ |
| double __exp(double x) /* wrapper exp */ |
| #else |
| double __exp(x) /* wrapper exp */ |
| double x; |
| #endif |
| { |
| #ifdef _IEEE_LIBM |
| return __ieee754_exp(x); |
| #else |
| double z; |
| z = __ieee754_exp(x); |
| if(_LIB_VERSION == _IEEE_) return z; |
| if(__finite(x)) { |
| if(x>o_threshold) |
| return __kernel_standard(x,x,6); /* exp overflow */ |
| else if(x<u_threshold) |
| return __kernel_standard(x,x,7); /* exp underflow */ |
| } |
| return z; |
| #endif |
| } |
| hidden_def (__exp) |
| weak_alias (__exp, exp) |
| #ifdef NO_LONG_DOUBLE |
| strong_alias (__exp, __expl) |
| weak_alias (__exp, expl) |
| #endif |
