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glibc  2.9
Functions
s_sinf.c File Reference
#include "math.h"
#include "math_private.h"

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Functions

float __sinf (float x)

Function Documentation

float __sinf ( float  x)

Definition at line 26 of file s_sinf.c.

{
       float y[2],z=0.0;
       int32_t n, ix;

       GET_FLOAT_WORD(ix,x);

    /* |x| ~< pi/4 */
       ix &= 0x7fffffff;
       if(ix <= 0x3f490fd8) return __kernel_sinf(x,z,0);

    /* sin(Inf or NaN) is NaN */
       else if (ix>=0x7f800000) return x-x;

    /* argument reduction needed */
       else {
           n = __ieee754_rem_pio2f(x,y);
           switch(n&3) {
              case 0: return  __kernel_sinf(y[0],y[1],1);
              case 1: return  __kernel_cosf(y[0],y[1]);
              case 2: return -__kernel_sinf(y[0],y[1],1);
              default:
                     return -__kernel_cosf(y[0],y[1]);
           }
       }
}

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