Last change
on this file since 389 was 389, checked in by coas-nagasima, 5 years ago |
ビルドが通るよう更新
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File size:
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[388] | 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 coshl(long double x)
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| 5 | {
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| 6 | return cosh(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 coshl(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 | uint32_t w;
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| 14 | long double t;
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| 15 |
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| 16 | /* |x| */
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| 17 | u.i.se = ex;
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| 18 | x = u.f;
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| 19 | w = u.i.m >> 32;
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| 20 |
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| 21 | /* |x| < log(2) */
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| 22 | if (ex < 0x3fff-1 || (ex == 0x3fff-1 && w < 0xb17217f7)) {
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| 23 | if (ex < 0x3fff-32) {
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| 24 | FORCE_EVAL(x + 0x1p120f);
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| 25 | return 1;
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| 26 | }
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| 27 | t = expm1l(x);
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| 28 | return 1 + t*t/(2*(1+t));
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| 29 | }
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| 30 |
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| 31 | /* |x| < log(LDBL_MAX) */
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| 32 | if (ex < 0x3fff+13 || (ex == 0x3fff+13 && w < 0xb17217f7)) {
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| 33 | t = expl(x);
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| 34 | return 0.5*(t + 1/t);
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| 35 | }
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| 36 |
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| 37 | /* |x| > log(LDBL_MAX) or nan */
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| 38 | t = expl(0.5*x);
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| 39 | return 0.5*t*t;
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| 40 | }
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| 41 | #elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
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| 42 | // TODO: broken implementation to make things compile
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| 43 | long double coshl(long double x)
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| 44 | {
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| 45 | return cosh(x);
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| 46 | }
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| 47 | #endif
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