Last change
on this file since 387 was 352, checked in by coas-nagasima, 6 years ago |
arm向けASP3版ECNLを追加
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File size:
973 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 asinhl(long double x)
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5 | {
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6 | return asinh(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 | /* asinh(x) = sign(x)*log(|x|+sqrt(x*x+1)) ~= x - x^3/6 + o(x^5) */
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10 | long double asinhl(long double x)
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11 | {
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12 | union ldshape u = {x};
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13 | unsigned e = u.i.se & 0x7fff;
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14 | unsigned s = u.i.se >> 15;
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15 |
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16 | /* |x| */
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17 | u.i.se = e;
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18 | x = u.f;
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19 |
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20 | if (e >= 0x3fff + 32) {
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21 | /* |x| >= 0x1p32 or inf or nan */
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22 | x = logl(x) + 0.693147180559945309417232121458176568L;
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23 | } else if (e >= 0x3fff + 1) {
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24 | /* |x| >= 2 */
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25 | x = logl(2*x + 1/(sqrtl(x*x+1)+x));
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26 | } else if (e >= 0x3fff - 32) {
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27 | /* |x| >= 0x1p-32 */
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28 | x = log1pl(x + x*x/(sqrtl(x*x+1)+1));
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29 | } else {
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30 | /* |x| < 0x1p-32, raise inexact if x!=0 */
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31 | FORCE_EVAL(x + 0x1p120f);
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32 | }
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33 | return s ? -x : x;
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34 | }
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35 | #elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
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36 | // TODO: broken implementation to make things compile
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37 | long double asinhl(long double x)
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38 | {
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39 | return asinh(x);
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40 | }
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41 | #endif
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