Last change
on this file since 403 was 337, checked in by coas-nagasima, 6 years ago |
ASP3版ECNLを追加
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Property svn:eol-style
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native
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Property svn:mime-type
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File size:
1003 bytes
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1 | #include "libm.h"
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2 |
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3 | #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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4 | long double tanhl(long double x)
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5 | {
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6 | return tanh(x);
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7 | }
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8 | #elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
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9 | long double tanhl(long double x)
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10 | {
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11 | union ldshape u = {x};
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12 | unsigned ex = u.i.se & 0x7fff;
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13 | unsigned sign = u.i.se & 0x8000;
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14 | uint32_t w;
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15 | long double t;
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16 |
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17 | /* x = |x| */
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18 | u.i.se = ex;
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19 | x = u.f;
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20 | w = u.i.m >> 32;
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21 |
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22 | if (ex > 0x3ffe || (ex == 0x3ffe && w > 0x8c9f53d5)) {
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23 | /* |x| > log(3)/2 ~= 0.5493 or nan */
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24 | if (ex >= 0x3fff+5) {
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25 | /* |x| >= 32 */
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26 | t = 1 + 0/(x + 0x1p-120f);
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27 | } else {
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28 | t = expm1l(2*x);
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29 | t = 1 - 2/(t+2);
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30 | }
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31 | } else if (ex > 0x3ffd || (ex == 0x3ffd && w > 0x82c577d4)) {
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32 | /* |x| > log(5/3)/2 ~= 0.2554 */
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33 | t = expm1l(2*x);
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34 | t = t/(t+2);
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35 | } else {
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36 | /* |x| is small */
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37 | t = expm1l(-2*x);
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38 | t = -t/(t+2);
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39 | }
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40 | return sign ? -t : t;
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41 | }
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42 | #elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
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43 | // TODO: broken implementation to make things compile
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44 | long double tanhl(long double x)
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45 | {
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46 | return tanh(x);
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47 | }
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48 | #endif
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