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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4973 | right-hear | 1 | /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */ |
| 2 | /* @(#)w_exp.c 5.1 93/09/24 */ |
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| 3 | /* |
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| 4 | * ==================================================== |
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| 5 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 6 | * |
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| 7 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 8 | * Permission to use, copy, modify, and distribute this |
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| 9 | * software is freely granted, provided that this notice |
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| 10 | * is preserved. |
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| 11 | * ==================================================== |
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| 12 | */ |
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| 13 | |||
| 14 | #if defined(LIBM_SCCS) && !defined(lint) |
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| 15 | static char rcsid[] = "$Id: w_exp.c,v 1.4 1994/08/10 20:34:00 jtc Exp $"; |
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| 16 | #endif |
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| 17 | |||
| 18 | /* |
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| 19 | * wrapper exp(x) |
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| 20 | */ |
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| 21 | |||
| 22 | #include "math.h" |
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| 23 | #include "math_private.h" |
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| 24 | |||
| 25 | #ifdef __STDC__ |
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| 26 | static const double |
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| 27 | #else |
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| 28 | static double |
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| 29 | #endif |
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| 30 | o_threshold= 7.09782712893383973096e+02, /* 0x40862E42, 0xFEFA39EF */ |
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| 31 | u_threshold= -7.45133219101941108420e+02; /* 0xc0874910, 0xD52D3051 */ |
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| 32 | |||
| 33 | #ifdef __STDC__ |
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| 34 | double exp(double x) /* wrapper exp */ |
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| 35 | #else |
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| 36 | double exp(x) /* wrapper exp */ |
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| 37 | double x; |
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| 38 | #endif |
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| 39 | { |
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| 40 | #ifdef _IEEE_LIBM |
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| 41 | return __ieee754_exp(x); |
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| 42 | #else |
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| 43 | double z; |
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| 44 | z = __ieee754_exp(x); |
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| 45 | if(_LIB_VERSION == _IEEE_) return z; |
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| 46 | if(finite(x)) { |
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| 47 | if(x>o_threshold) |
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| 48 | return __kernel_standard(x,x,6); /* exp overflow */ |
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| 49 | else if(x |
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| 50 | return __kernel_standard(x,x,7); /* exp underflow */ |
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| 51 | } |
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| 52 | return z; |
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| 53 | #endif |
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| 54 | } |