dnl @synopsis AC_C_CLIP_MODEdnldnl Determine the clipping mode when converting float to int.dnl @version 1.0	May 17 2003dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>dnldnl Permission to use, copy, modify, distribute, and sell this file for any dnl purpose is hereby granted without fee, provided that the above copyright dnl and this permission notice appear in all copies.  No representations arednl made about the suitability of this software for any purpose.  It is dnl provided "as is" without express or implied warranty.       dnl Find the clipping mode in the following way:dnl    1) If we are not cross compiling test it.dnl    2) IF we are cross compiling, assume that clipping isn't done correctly. AC_DEFUN([AC_C_CLIP_MODE],[AC_CACHE_CHECK(processor clipping capabilities, 	ac_cv_c_clip_type, # Initialize to unknownac_cv_c_clip_positive=unknownac_cv_c_clip_negative=unknown  if test $ac_cv_c_clip_positive = unknown ; then	AC_TRY_RUN(	[[	#define	_ISOC9X_SOURCE	1	#define _ISOC99_SOURCE	1	#define	__USE_ISOC99	1	#define __USE_ISOC9X	1	#include <math.h>	int main (void)	{	double	fval ;		int k, ival ; 		fval = 1.0 * 0x7FFFFFFF ;		for (k = 0 ; k < 100 ; k++)		{	ival = (lrint (fval)) >> 24 ;			if (ival != 127)				return 1 ;					fval *= 1.2499999 ;			} ;					return 0 ;		}		]],		ac_cv_c_clip_positive=yes,		ac_cv_c_clip_positive=no,		ac_cv_c_clip_positive=unknown		) 	AC_TRY_RUN(	[[	#define	_ISOC9X_SOURCE	1	#define _ISOC99_SOURCE	1	#define	__USE_ISOC99	1	#define __USE_ISOC9X	1	#include <math.h>	int main (void)	{	double	fval ;		int k, ival ; 		fval = -8.0 * 0x10000000 ;		for (k = 0 ; k < 100 ; k++)		{	ival = (lrint (fval)) >> 24 ;			if (ival != -128)				return 1 ;					fval *= 1.2499999 ;			} ;					return 0 ;		}		]],		ac_cv_c_clip_negative=yes,		ac_cv_c_clip_negative=no,		ac_cv_c_clip_negative=unknown		)	fi if test $ac_cv_c_clip_positive = yes ; then	ac_cv_c_clip_positive=1else	ac_cv_c_clip_positive=0	fi if test $ac_cv_c_clip_negative = yes ; then	ac_cv_c_clip_negative=1else	ac_cv_c_clip_negative=0	fi [[case "$ac_cv_c_clip_positive$ac_cv_c_clip_negative" in	"00")		ac_cv_c_clip_type="none"		;;	"10")		ac_cv_c_clip_type="positive"		;;	"01")		ac_cv_c_clip_type="negative"		;;	"11")		ac_cv_c_clip_type="both"		;;	esac	]] )] )# AC_C_CLIP_MODE