Last change
on this file since 559 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.2 KB
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1 | /* ef_atanh.c -- float version of e_atanh.c. |
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2 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
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3 | */ |
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4 | |
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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 | */ |
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16 | |
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17 | #include "fdlibm.h" |
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18 | |
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19 | #ifdef __STDC__ |
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20 | static const float one = 1.0, huge = 1e30; |
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21 | #else |
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22 | static float one = 1.0, huge = 1e30; |
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23 | #endif |
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24 | |
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25 | #ifdef __STDC__ |
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26 | static const float zero = 0.0; |
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27 | #else |
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28 | static float zero = 0.0; |
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29 | #endif |
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30 | |
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31 | #ifdef __STDC__ |
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32 | float atanhf(float x) |
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33 | #else |
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34 | float atanhf(x) |
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35 | float x; |
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36 | #endif |
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37 | { |
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38 | float t; |
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39 | __int32_t hx,ix; |
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40 | GET_FLOAT_WORD(hx,x); |
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41 | ix = hx&0x7fffffff; |
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42 | if (ix>0x3f800000) /* |x|>1 */ |
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43 | return (x-x)/(x-x); |
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44 | if(ix==0x3f800000) |
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45 | return x/zero; |
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46 | if(ix<0x31800000&&(huge+x)>zero) return x; /* x<2**-28 */ |
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47 | SET_FLOAT_WORD(x,ix); |
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48 | if(ix<0x3f000000) { /* x < 0.5 */ |
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49 | t = x+x; |
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50 | t = (float)0.5*log1pf(t+t*x/(one-x)); |
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51 | } else |
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52 | t = (float)0.5*log1pf((x+x)/(one-x)); |
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53 | if(hx>=0) return t; else return -t; |
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54 | } |
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