Subversion Repositories openrisc_2011-10-31

/* sf_log2.c -- float version of s_log2.c.

 * Modification of sf_exp10.c by Yaakov Selkowitz 2009.

 */

/*

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

 * 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.

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

 */

/*

 * wrapper log2f(x)

 */

#include "fdlibm.h"

#include <errno.h>

#include <math.h>

#undef log2

#undef log2f

#ifdef __STDC__

        float log2f(float x)            /* wrapper log2f */

#else

        float log2f(x)                  /* wrapper log2f */

        float x;

#endif

{

  return (logf(x) / (float) M_LOG2_E);

}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__

        double log2(double x)

#else

        double log2(x)

        double x;

#endif

{

        return (double) log2f((float) x);

}

#endif /* defined(_DOUBLE_IS_32BITS) */