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4973 | right-hear | 1 | /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */ |
2 | /* w_expf.c -- float version of w_exp.c. |
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3 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
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4 | */ |
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5 | |||
6 | /* |
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7 | * ==================================================== |
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8 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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9 | * |
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10 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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11 | * Permission to use, copy, modify, and distribute this |
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12 | * software is freely granted, provided that this notice |
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13 | * is preserved. |
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14 | * ==================================================== |
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15 | */ |
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16 | |||
17 | #if defined(LIBM_SCCS) && !defined(lint) |
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18 | static char rcsid[] = "$Id: w_expf.c,v 1.1 1994/08/10 20:34:03 jtc Exp $"; |
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19 | #endif |
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20 | |||
21 | /* |
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22 | * wrapper expf(x) |
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23 | */ |
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24 | |||
25 | #include "math.h" |
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26 | #include "math_private.h" |
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27 | |||
28 | #ifdef __STDC__ |
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29 | static const float |
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30 | #else |
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31 | static float |
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32 | #endif |
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33 | o_threshold= 8.8721679688e+01, /* 0x42b17180 */ |
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34 | u_threshold= -1.0397208405e+02; /* 0xc2cff1b5 */ |
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35 | |||
36 | #ifdef __STDC__ |
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37 | float expf(float x) /* wrapper expf */ |
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38 | #else |
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39 | float expf(x) /* wrapper expf */ |
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40 | float x; |
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41 | #endif |
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42 | { |
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43 | #ifdef _IEEE_LIBM |
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44 | return __ieee754_expf(x); |
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45 | #else |
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46 | float z; |
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47 | z = __ieee754_expf(x); |
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48 | if(_LIB_VERSION == _IEEE_) return z; |
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49 | if(finitef(x)) { |
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50 | if(x>o_threshold) |
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51 | /* exp overflow */ |
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52 | return (float)__kernel_standard((double)x,(double)x,106); |
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53 | else if(x |
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54 | /* exp underflow */ |
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55 | return (float)__kernel_standard((double)x,(double)x,107); |
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56 | } |
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57 | return z; |
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58 | #endif |
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59 | } |