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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | /* w_expf.c -- float version of w_exp.c. |
| 2 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
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| 3 | */ |
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| 4 | |||
| 5 | /* |
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| 6 | * ==================================================== |
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| 7 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 8 | * |
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| 9 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 10 | * Permission to use, copy, modify, and distribute this |
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| 11 | * software is freely granted, provided that this notice |
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| 12 | * is preserved. |
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| 13 | * ==================================================== |
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| 14 | */ |
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| 15 | |||
| 16 | #ifndef lint |
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| 17 | static char rcsid[] = "$\Id: w_expf.c,v 1.2 1995/05/30 05:51:00 rgrimes Exp $"; |
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| 18 | #endif |
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| 19 | |||
| 20 | /* |
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| 21 | * wrapper expf(x) |
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| 22 | */ |
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| 23 | |||
| 24 | #include "math.h" |
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| 25 | #include "math_private.h" |
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| 26 | |||
| 27 | #ifdef __STDC__ |
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| 28 | static const float |
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| 29 | #else |
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| 30 | static float |
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| 31 | #endif |
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| 32 | o_threshold= 8.8721679688e+01, /* 0x42b17180 */ |
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| 33 | u_threshold= -1.0397208405e+02; /* 0xc2cff1b5 */ |
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| 34 | |||
| 35 | #ifdef __STDC__ |
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| 36 | float expf(float x) /* wrapper expf */ |
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| 37 | #else |
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| 38 | float expf(x) /* wrapper expf */ |
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| 39 | float x; |
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| 40 | #endif |
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| 41 | { |
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| 42 | #ifdef _IEEE_LIBM |
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| 43 | return __ieee754_expf(x); |
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| 44 | #else |
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| 45 | float z; |
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| 46 | z = __ieee754_expf(x); |
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| 47 | if(_LIB_VERSION == _IEEE_) return z; |
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| 48 | if(finitef(x)) { |
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| 49 | if(x>o_threshold) |
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| 50 | /* exp overflow */ |
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| 51 | return (float)__kernel_standard((double)x,(double)x,106); |
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| 52 | else if(x<u_threshold) |
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| 53 | /* exp underflow */ |
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| 54 | return (float)__kernel_standard((double)x,(double)x,107); |
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| 55 | } |
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| 56 | return z; |
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| 57 | #endif |
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| 58 | } |