1 /* s_cosl.c -- long double version of s_cos.c.
2 * Conversion to long double by Jakub Jelinek, jj@ultra.linux.cz.
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
13 * ====================================================
17 * Return cosine function of x.
20 * __kernel_sinl ... sine function on [-pi/4,pi/4]
21 * __kernel_cosl ... cosine function on [-pi/4,pi/4]
22 * __ieee754_rem_pio2l ... argument reduction routine
25 * Let S,C and T denote the sin, cos and tan respectively on
26 * [-PI/4, +PI/4]. Reduce the argument x to y1+y2 = x-k*pi/2
27 * in [-pi/4 , +pi/4], and let n = k mod 4.
30 * n sin(x) cos(x) tan(x)
31 * ----------------------------------------------------------
36 * ----------------------------------------------------------
39 * Let trig be any of sin, cos, or tan.
40 * trig(+-INF) is NaN, with signals;
41 * trig(NaN) is that NaN;
44 * TRIG(x) returns trig(x) nearly rounded
47 #include "quadmath-imp.h"
52 __float128 y[2],z=0.0Q;
56 GET_FLT128_MSW64(ix,x);
59 ix &= 0x7fffffffffffffffLL;
60 if(ix <= 0x3ffe921fb54442d1LL)
61 return __quadmath_kernel_cosq(x,z);
63 /* cos(Inf or NaN) is NaN */
64 else if (ix>=0x7fff000000000000LL) {
65 if (ix == 0x7fff000000000000LL) {
66 GET_FLT128_LSW64(n,x);
71 /* argument reduction needed */
73 n = __quadmath_rem_pio2q(x,y);
75 case 0: return __quadmath_kernel_cosq(y[0],y[1]);
76 case 1: return -__quadmath_kernel_sinq(y[0],y[1],1);
77 case 2: return -__quadmath_kernel_cosq(y[0],y[1]);
79 return __quadmath_kernel_sinq(y[0],y[1],1);