text: /*	$NetBSD: flt_rounds.c,v 1.3 1997/10/13 21:24:39 mark Exp $	*/
  
  /*
   * Copyright (c) 1996 Mark Brinicombe
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *      This product includes software developed by Mark Brinicombe
   *	for the NetBSD Project.
   * 4. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include <sys/types.h>
  #include <ieeefp.h>
  
  static const int map[] = {
  	1,	/* round to nearest */
  	2,	/* round to positive infinity */
  	3,	/* round to negative infinity */
  	0	/* round to zero */
  };
  
  /*
   * Return the current FP rounding mode
   *
   * Returns:
   *	0 - round to zero
   *	1 - round to nearest
   *	2 - round to postive infinity
   *	3 - round to negative infinity
   *
   * ok all we need to do is get the current FP rounding mode
   * index our map table and return the appropriate value.
   *
   * HOWEVER:
   * The ARM FPA codes the rounding mode into the actual FP instructions
   * so there is no such thing as a global rounding mode.
   * The default is round to nearest if rounding is not explictly specified.
   * FP instructions generated by GCC will not explicitly specify a rounding
   * mode.
   *
   * So the best we can do it to return the rounding mode FP instructions
   * use if rounding is not specified which is round to nearest.
   *
   * This could change in the future with new floating point emulators or
   * soft float FP libraries.
   */
  
  int __flt_rounds(void);
  
  int
  __flt_rounds()
  {
  	return(map[fpgetround()]);
  }
  