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) */