Last change
on this file was 352, checked in by coas-nagasima, 6 years ago |
arm向け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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text/x-csrc;charset=UTF-8
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File size:
1003 bytes
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[352] | 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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