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

Function Documentation

double attribute_hidden __kernel_cos ( double  x,
double  y 
)

Definition at line 74 of file k_cos.c.

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

Referenced by libm_hidden_proto().

77 {
78  double a, hz, z, r, qx;
79  int32_t ix;
80  GET_HIGH_WORD(ix, x);
81  ix &= 0x7fffffff; /* ix = |x|'s high word */
82  if (ix < 0x3e400000) { /* if x < 2**27 */
83  if (((int) x) == 0)
84  return one; /* generate inexact */
85  }
86  z = x * x;
87  r = z * (C1 + z * (C2 + z * (C3 + z * (C4 + z * (C5 + z * C6)))));
88  if (ix < 0x3FD33333) /* if |x| < 0.3 */
89  return one - (0.5 * z - (z * r - x * y));
90  else {
91  if (ix > 0x3fe90000) { /* x > 0.78125 */
92  qx = 0.28125;
93  } else {
94  INSERT_WORDS(qx, ix - 0x00200000, 0); /* x/4 */
95  }
96  hz = 0.5 * z - qx;
97  a = one - qx;
98  return a - (hz - (z * r - x * y));
99  }
100 }
#define GET_HIGH_WORD(i, d)
Definition: math_private.h:103
GLdouble GLdouble GLdouble r
Definition: SDL_opengl.h:2072
signed int int32_t
GLint GLint GLint GLint GLint x
Definition: SDL_opengl.h:1567
static double one
Definition: k_cos.c:61
static double C2
Definition: k_cos.c:63
static double C5
Definition: k_cos.c:66
GLint GLint GLint GLint GLint GLint y
Definition: SDL_opengl.h:1567
static double C4
Definition: k_cos.c:65
#define INSERT_WORDS(d, ix0, ix1)
Definition: math_private.h:121
static double C3
Definition: k_cos.c:64
static double C6
Definition: k_cos.c:67
GLdouble GLdouble z
static double C1
Definition: k_cos.c:62
GLboolean GLboolean GLboolean GLboolean a

Variable Documentation

double C1 = 4.16666666666666019037e-02
static

Definition at line 62 of file k_cos.c.

Referenced by __kernel_cos().

double C2 = -1.38888888888741095749e-03
static

Definition at line 63 of file k_cos.c.

Referenced by __kernel_cos().

double C3 = 2.48015872894767294178e-05
static

Definition at line 64 of file k_cos.c.

Referenced by __kernel_cos().

double C4 = -2.75573143513906633035e-07
static

Definition at line 65 of file k_cos.c.

Referenced by __kernel_cos().

double C5 = 2.08757232129817482790e-09
static

Definition at line 66 of file k_cos.c.

Referenced by __kernel_cos().

double C6 = -1.13596475577881948265e-11
static

Definition at line 67 of file k_cos.c.

Referenced by __kernel_cos().

double one = 1.00000000000000000000e+00
static

Definition at line 61 of file k_cos.c.

Referenced by __kernel_cos().