k_cos.c File Reference

#include "math_libm.h"
#include "math_private.h"

Include dependency graph for k_cos.c:

Go to the source code of this file.

Functions
double attribute_hidden	__kernel_cos (double x, double y)

Variables
static const double	one = 1.00000000000000000000e+00
static const double	C1 = 4.16666666666666019037e-02
static const double	C2 = -1.38888888888741095749e-03
static const double	C3 = 2.48015872894767294178e-05
static const double	C4 = -2.75573143513906633035e-07
static const double	C5 = 2.08757232129817482790e-09
static const double	C6 = -1.13596475577881948265e-11

Function Documentation

double attribute_hidden __kernel_cos	(	double	x,
		double	y
	)

Definition at line 59 of file k_cos.c.

References C1, C2, C3, C4, C5, C6, GET_HIGH_WORD, INSERT_WORDS, and one.

Referenced by cos(), and sin().

{
        double a,hz,z,r,qx;
        int32_t ix;
        GET_HIGH_WORD(ix,x);
        ix &= 0x7fffffff;                       /* ix = |x|'s high word*/
        if(ix<0x3e400000) {                     /* if x < 2**27 */
            if(((int)x)==0) return one;         /* generate inexact */
        }
        z  = x*x;
        r  = z*(C1+z*(C2+z*(C3+z*(C4+z*(C5+z*C6)))));
        if(ix < 0x3FD33333)                     /* if |x| < 0.3 */
            return one - (0.5*z - (z*r - x*y));
        else {
            if(ix > 0x3fe90000) {               /* x > 0.78125 */
                qx = 0.28125;
            } else {
                INSERT_WORDS(qx,ix-0x00200000,0);       /* x/4 */
            }
            hz = 0.5*z-qx;
            a  = one-qx;
            return a - (hz - (z*r-x*y));
        }
}

Variable Documentation

const double C1 = 4.16666666666666019037e-02

static

Definition at line 52 of file k_cos.c.

Referenced by __kernel_cos().

const double C2 = -1.38888888888741095749e-03

static

Definition at line 53 of file k_cos.c.

Referenced by __kernel_cos().

const double C3 = 2.48015872894767294178e-05

static

Definition at line 54 of file k_cos.c.

Referenced by __kernel_cos().

const double C4 = -2.75573143513906633035e-07

static

Definition at line 55 of file k_cos.c.

Referenced by __kernel_cos().

const double C5 = 2.08757232129817482790e-09

static

Definition at line 56 of file k_cos.c.

Referenced by __kernel_cos().

const double C6 = -1.13596475577881948265e-11

static

Definition at line 57 of file k_cos.c.

Referenced by __kernel_cos().

const double one = 1.00000000000000000000e+00

static

Definition at line 51 of file k_cos.c.

Referenced by __kernel_cos().