s_sin.c File Reference

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

Include dependency graph for s_sin.c:

Go to the source code of this file.

Functions
double	sin (double x)

Function Documentation

sin()

double sin

(

double

x

)

Definition at line 46 of file s_sin.c.

{
        double y[2],z=0.0;
        int32_t n, ix;
 
    /* High word of x. */
        GET_HIGH_WORD(ix,x);
 
    /* |x| ~< pi/4 */
        ix &= 0x7fffffff;
        if(ix <= 0x3fe921fb) return __kernel_sin(x,z,0);
 
    /* sin(Inf or NaN) is NaN */
        else if (ix>=0x7ff00000) return x-x;
 
    /* argument reduction needed */
        else {
            n = __ieee754_rem_pio2(x,y);
            switch(n&3) {
                case 0: return  __kernel_sin(y[0],y[1],1);
                case 1: return  __kernel_cos(y[0],y[1]);
                case 2: return -__kernel_sin(y[0],y[1],1);
                default:
                        return -__kernel_cos(y[0],y[1]);
            }
        }
}

References __ieee754_rem_pio2(), __kernel_cos(), __kernel_sin(), and GET_HIGH_WORD.

Referenced by SDL_sin().