SDL  2.0
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

◆ __kernel_cos()

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().

60 {
61  double a,hz,z,r,qx;
62  int32_t ix;
63  GET_HIGH_WORD(ix,x);
64  ix &= 0x7fffffff; /* ix = |x|'s high word*/
65  if(ix<0x3e400000) { /* if x < 2**27 */
66  if(((int)x)==0) return one; /* generate inexact */
67  }
68  z = x*x;
69  r = z*(C1+z*(C2+z*(C3+z*(C4+z*(C5+z*C6)))));
70  if(ix < 0x3FD33333) /* if |x| < 0.3 */
71  return one - (0.5*z - (z*r - x*y));
72  else {
73  if(ix > 0x3fe90000) { /* x > 0.78125 */
74  qx = 0.28125;
75  } else {
76  INSERT_WORDS(qx,ix-0x00200000,0); /* x/4 */
77  }
78  hz = 0.5*z-qx;
79  a = one-qx;
80  return a - (hz - (z*r-x*y));
81  }
82 }
#define GET_HIGH_WORD(i, d)
Definition: math_private.h:108
GLdouble GLdouble GLdouble r
Definition: SDL_opengl.h:2079
GLdouble GLdouble z
static const double C5
Definition: k_cos.c:56
GLint GLint GLint GLint GLint x
Definition: SDL_opengl.h:1574
signed int int32_t
static const double C1
Definition: k_cos.c:52
static const double C2
Definition: k_cos.c:53
static const double C4
Definition: k_cos.c:55
static const double C6
Definition: k_cos.c:57
#define INSERT_WORDS(d, ix0, ix1)
Definition: math_private.h:126
static const double C3
Definition: k_cos.c:54
GLint GLint GLint GLint GLint GLint y
Definition: SDL_opengl.h:1574
static const double one
Definition: k_cos.c:51
GLboolean GLboolean GLboolean GLboolean a

Variable Documentation

◆ C1

const double C1 = 4.16666666666666019037e-02
static

Definition at line 52 of file k_cos.c.

Referenced by __kernel_cos().

◆ C2

const double C2 = -1.38888888888741095749e-03
static

Definition at line 53 of file k_cos.c.

Referenced by __kernel_cos().

◆ C3

const double C3 = 2.48015872894767294178e-05
static

Definition at line 54 of file k_cos.c.

Referenced by __kernel_cos().

◆ C4

const double C4 = -2.75573143513906633035e-07
static

Definition at line 55 of file k_cos.c.

Referenced by __kernel_cos().

◆ C5

const double C5 = 2.08757232129817482790e-09
static

Definition at line 56 of file k_cos.c.

Referenced by __kernel_cos().

◆ C6

const double C6 = -1.13596475577881948265e-11
static

Definition at line 57 of file k_cos.c.

Referenced by __kernel_cos().

◆ one

const double one = 1.00000000000000000000e+00
static

Definition at line 51 of file k_cos.c.

Referenced by __kernel_cos().