projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| f7eac6eb RM |
1 | /* @(#)w_exp.c 5.1 93/09/24 */ |
| 2 | /* | |
| 3 | * ==================================================== | |
| 4 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. | |
| 5 | * | |
| 6 | * Developed at SunPro, a Sun Microsystems, Inc. business. | |
| 7 | * Permission to use, copy, modify, and distribute this | |
| 8 | * software is freely granted, provided that this notice | |
| 9 | * is preserved. | |
| 10 | * ==================================================== | |
| 11 | */ | |
| 12 | ||
| 13 | #if defined(LIBM_SCCS) && !defined(lint) | |
| 14 | static char rcsid[] = "$NetBSD: w_exp.c,v 1.6 1995/05/10 20:48:51 jtc Exp $"; | |
| 15 | #endif | |
| 16 | ||
| 17 | /* | |
| 18 | * wrapper exp(x) | |
| 19 | */ | |
| 20 | ||
| 21 | #include "math.h" | |
| 22 | #include "math_private.h" | |
| 23 | ||
| 24 | #ifdef __STDC__ | |
| 25 | static const double | |
| 26 | #else | |
| 27 | static double | |
| 28 | #endif | |
| 29 | o_threshold= 7.09782712893383973096e+02, /* 0x40862E42, 0xFEFA39EF */ | |
| 30 | u_threshold= -7.45133219101941108420e+02; /* 0xc0874910, 0xD52D3051 */ | |
| 31 | ||
| 32 | #ifdef __STDC__ | |
| 33 | double __exp(double x) /* wrapper exp */ | |
| 34 | #else | |
| 35 | double __exp(x) /* wrapper exp */ | |
| 36 | double x; | |
| 37 | #endif | |
| 38 | { | |
| 39 | #ifdef _IEEE_LIBM | |
| 40 | return __ieee754_exp(x); | |
| 41 | #else | |
| 42 | double z; | |
| 43 | z = __ieee754_exp(x); | |
| 44 | if(_LIB_VERSION == _IEEE_) return z; | |
| 45 | if(__finite(x)) { | |
| 46 | if(x>o_threshold) | |
| 47 | return __kernel_standard(x,x,6); /* exp overflow */ | |
| 48 | else if(x<u_threshold) | |
| 49 | return __kernel_standard(x,x,7); /* exp underflow */ | |
| 50 | } | |
| 51 | return z; | |
| 52 | #endif | |
| 53 | } | |
| 54 | weak_alias (__exp, exp) |