/* s_floorf.c -- float version of s_floor.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.

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

 */

/*

 * floorf(x)

 * Return x rounded toward -inf to integral value

 * Method:

 *	Bit twiddling.

 */

#include <math.h>

#include <math_private.h>

#include <libm-alias-float.h>

#include <math-use-builtins.h>

float

__floorf (float x)

{

#if USE_FLOORF_BUILTIN

  return __builtin_floorf (x);

#else

  /* Use generic implementation.  */

  int32_t i0, j0;

  uint32_t i;

  GET_FLOAT_WORD (i0, x);

  j0 = ((i0 >> 23) & 0xff) - 0x7f;

  if (j0 < 23)

    {

      if (j0 < 0)

	{

	  /* return 0 * sign (x) if |x| < 1  */

	  if (i0 >= 0)

	    i0 = 0;

	  else if ((i0 & 0x7fffffff) != 0)

	    i0 = 0xbf800000;

	}

      else

	{

	  i = (0x007fffff) >> j0;

	  if ((i0 & i) == 0)

	    return x;		/* x is integral  */

	  if (i0 < 0)

	    i0 += (0x00800000) >> j0;

	  i0 &= (~i);

	}

    }

  else

    {

      if (__glibc_unlikely (j0 == 0x80))

	return x + x;		/* inf or NaN  */

      else

	return x;		/* x is integral  */

    }

  SET_FLOAT_WORD (x, i0);

  return x;

#endif /* ! USE_FLOORF_BUILTIN  */

}

#ifndef __floorf

libm_alias_float (__floor, floor)

#endif