1#include "libm.h"
2
3#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
4long double tanl(long double x)
5{
6	return tan(x);
7}
8#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
9long double tanl(long double x)
10{
11	union ldshape u = {x};
12	long double y[2];
13	unsigned n;
14
15	u.i.se &= 0x7fff;
16	if (u.i.se == 0x7fff)
17		return x - x;
18	if (u.f < M_PI_4) {
19		if (u.i.se < 0x3fff - LDBL_MANT_DIG/2) {
20			/* raise inexact if x!=0 and underflow if subnormal */
21			FORCE_EVAL(u.i.se == 0 ? x*0x1p-120f : x+0x1p120f);
22			return x;
23		}
24		return __tanl(x, 0, 0);
25	}
26	n = __rem_pio2l(x, y);
27	return __tanl(y[0], y[1], n&1);
28}
29#endif
30