Subversion Repositories openrisc_2011-10-31

/* sf_cos.c -- float version of s_cos.c.

 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.

 */

/*

 * ====================================================

 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

 *

 * Developed at SunPro, a Sun Microsystems, Inc. business.

 * Permission to use, copy, modify, and distribute this

 * software is freely granted, provided that this notice

 * is preserved.

 * ====================================================

 */

#include "fdlibm.h"

#ifdef __STDC__

static const float one=1.0;

#else

static float one=1.0;

#endif

#ifdef __STDC__

        float cosf(float x)

#else

        float cosf(x)

        float x;

#endif

{

        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 (!FLT_UWORD_IS_FINITE(ix)) 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);

            }

        }

}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__

        double cos(double x)

#else

        double cos(x)

        double x;

#endif

{

        return (double) cosf((float) x);

}

#endif /* defined(_DOUBLE_IS_32BITS) */