Subversion Repositories openrisc_2011-10-31

/* sf_tan.c -- float version of s_tan.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__

        float tanf(float x)

#else

        float tanf(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 <= 0x3f490fda) return __kernel_tanf(x,z,1);

    /* tan(Inf or NaN) is NaN */

        else if (!FLT_UWORD_IS_FINITE(ix)) return x-x;          /* NaN */

    /* argument reduction needed */

        else {

            n = __ieee754_rem_pio2f(x,y);

            return __kernel_tanf(y[0],y[1],1-((n&1)<<1)); /*   1 -- n even

                                                              -1 -- n odd */

        }

}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__

        double tan(double x)

#else

        double tan(x)

        double x;

#endif

{

        return (double) tanf((float) x);

}

#endif /* defined(_DOUBLE_IS_32BITS) */