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glibc  2.9
Functions | Variables
s_cosf.c File Reference
#include "math.h"
#include "math_private.h"

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Functions

float __cosf (float x)

Variables

static float one = 1.0

Function Documentation

float __cosf ( float  x)

Definition at line 32 of file s_cosf.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_cosf(x,z);

    /* cos(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_cosf(y[0],y[1]);
              case 1: return -__kernel_sinf(y[0],y[1],1);
              case 2: return -__kernel_cosf(y[0],y[1]);
              default:
                      return  __kernel_sinf(y[0],y[1],1);
           }
       }
}

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Variable Documentation

float one = 1.0 [static]

Definition at line 26 of file s_cosf.c.