48 lines
926 B
C
48 lines
926 B
C
#include "libc/math/libm.h"
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#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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long double coshl(long double x)
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{
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return cosh(x);
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}
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#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
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long double coshl(long double x)
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{
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union ldshape u = {x};
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unsigned ex = u.i.se & 0x7fff;
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uint32_t w;
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long double t;
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/* |x| */
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u.i.se = ex;
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x = u.f;
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w = u.i.m >> 32;
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/* |x| < log(2) */
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if (ex < 0x3fff-1 || (ex == 0x3fff-1 && w < 0xb17217f7)) {
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if (ex < 0x3fff-32) {
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FORCE_EVAL(x + 0x1p120f);
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return 1;
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}
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t = expm1l(x);
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return 1 + t*t/(2*(1+t));
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}
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/* |x| < log(LDBL_MAX) */
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if (ex < 0x3fff+13 || (ex == 0x3fff+13 && w < 0xb17217f7)) {
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t = expl(x);
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return 0.5*(t + 1/t);
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}
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/* |x| > log(LDBL_MAX) or nan */
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t = expl(0.5*x);
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return 0.5*t*t;
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}
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#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
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// TODO: broken implementation to make things compile
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long double coshl(long double x)
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{
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return cosh(x);
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}
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#endif
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