1 #include "libm.h" 2 3 #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024 tanl(long double x)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 tanl(long double x)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