diff options
Diffstat (limited to 'sysdeps/ieee754/ldbl-128/s_tanl.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128/s_tanl.c | 80 |
1 files changed, 0 insertions, 80 deletions
diff --git a/sysdeps/ieee754/ldbl-128/s_tanl.c b/sysdeps/ieee754/ldbl-128/s_tanl.c deleted file mode 100644 index cd7b258616..0000000000 --- a/sysdeps/ieee754/ldbl-128/s_tanl.c +++ /dev/null @@ -1,80 +0,0 @@ -/* s_tanl.c -- long double version of s_tan.c. - * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz. - */ - -/* @(#)s_tan.c 5.1 93/09/24 */ -/* - * ==================================================== - * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. - * - * Developed at SunPro, a Sun Microsystems, Inc. business. - * Permission to use, copy, modify, and distribute this - * software is freely granted, provided that this notice - * is preserved. - * ==================================================== - */ - -/* tanl(x) - * Return tangent function of x. - * - * kernel function: - * __kernel_tanl ... tangent function on [-pi/4,pi/4] - * __ieee754_rem_pio2l ... argument reduction routine - * - * Method. - * Let S,C and T denote the sin, cos and tan respectively on - * [-PI/4, +PI/4]. Reduce the argument x to y1+y2 = x-k*pi/2 - * in [-pi/4 , +pi/4], and let n = k mod 4. - * We have - * - * n sin(x) cos(x) tan(x) - * ---------------------------------------------------------- - * 0 S C T - * 1 C -S -1/T - * 2 -S -C T - * 3 -C S -1/T - * ---------------------------------------------------------- - * - * Special cases: - * Let trig be any of sin, cos, or tan. - * trig(+-INF) is NaN, with signals; - * trig(NaN) is that NaN; - * - * Accuracy: - * TRIG(x) returns trig(x) nearly rounded - */ - -#include <errno.h> -#include <math.h> -#include <math_private.h> - -_Float128 __tanl(_Float128 x) -{ - _Float128 y[2],z=0; - int64_t n, ix; - - /* High word of x. */ - GET_LDOUBLE_MSW64(ix,x); - - /* |x| ~< pi/4 */ - ix &= 0x7fffffffffffffffLL; - if(ix <= 0x3ffe921fb54442d1LL) return __kernel_tanl(x,z,1); - - /* tanl(Inf or NaN) is NaN */ - else if (ix>=0x7fff000000000000LL) { - if (ix == 0x7fff000000000000LL) { - GET_LDOUBLE_LSW64(n,x); - if (n == 0) - __set_errno (EDOM); - } - return x-x; /* NaN */ - } - - /* argument reduction needed */ - else { - n = __ieee754_rem_pio2l(x,y); - return __kernel_tanl(y[0],y[1],1-((n&1)<<1)); /* 1 -- n even - -1 -- n odd */ - } -} -weak_alias (__tanl, tanl) |