Subversion Repositories openrisc_2011-10-31

/*

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

 * 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 roundf(float x)

#else

        float roundf(x)

        float x;

#endif

{

  int signbit;

  __uint32_t w;

  /* Most significant word, least significant word. */

  int exponent_less_127;

  GET_FLOAT_WORD(w, x);

  /* Extract sign bit. */

  signbit = w & 0x80000000;

  /* Extract exponent field. */

  exponent_less_127 = (int)((w & 0x7f800000) >> 23) - 127;

  if (exponent_less_127 < 23)

    {

      if (exponent_less_127 < 0)

        {

          w &= 0x80000000;

          if (exponent_less_127 == -1)

            /* Result is +1.0 or -1.0. */

            w |= (127 << 23);

        }

      else

        {

          unsigned int exponent_mask = 0x007fffff >> exponent_less_127;

          if ((w & exponent_mask) == 0)

            /* x has an integral value. */

            return x;

          w += 0x00400000 >> exponent_less_127;

          w &= ~exponent_mask;

        }

    }

  else

    {

      if (exponent_less_127 == 128)

        /* x is NaN or infinite. */

        return x + x;

      else

        return x;

    }

  SET_FLOAT_WORD(x, w);

  return x;

}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__

        double round(double x)

#else

        double round(x)

        double x;

#endif

{

        return (double) roundf((float) x);

}

#endif /* defined(_DOUBLE_IS_32BITS) */