Create a branch for cmake bringup.

svn path=/branches/cmake-bringup/; revision=48236

lib/3rdparty/libsamplerate/float_cast.h

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+/*
+** Copyright (C) 2001-2008 Erik de Castro Lopo <erikd@mega-nerd.com>
+**
+** This program is free software; you can redistribute it and/or modify
+** it under the terms of the GNU Lesser General Public License as published by
+** the Free Software Foundation; either version 2.1 of the License, or
+** (at your option) any later version.
+**
+** This program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+** GNU Lesser General Public License for more details.
+**
+** You should have received a copy of the GNU Lesser General Public License
+** along with this program; if not, write to the Free Software
+** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+*/
+
+/* Version 1.4 */
+
+#ifndef FLOAT_CAST_HEADER
+#define FLOAT_CAST_HEADER
+
+/*============================================================================
+**	On Intel Pentium processors (especially PIII and probably P4), converting
+**	from float to int is very slow. To meet the C specs, the code produced by
+**	most C compilers targeting Pentium needs to change the FPU rounding mode
+**	before the float to int conversion is performed.
+**
+**	Changing the FPU rounding mode causes the FPU pipeline to be flushed. It
+**	is this flushing of the pipeline which is so slow.
+**
+**	Fortunately the ISO C99 specifications define the functions lrint, lrintf,
+**	llrint and llrintf which fix this problem as a side effect.
+**
+**	On Unix-like systems, the configure process should have detected the
+**	presence of these functions. If they weren't found we have to replace them
+**	here with a standard C cast.
+*/
+
+/*
+**	The C99 prototypes for lrint and lrintf are as follows:
+**
+**		long int lrintf (float x) ;
+**		long int lrint  (double x) ;
+*/
+
+#include "config.h"
+
+/*
+**	The presence of the required functions are detected during the configure
+**	process and the values HAVE_LRINT and HAVE_LRINTF are set accordingly in
+**	the config.h file.
+*/
+
+#define		HAVE_LRINT_REPLACEMENT	0
+
+#if (HAVE_LRINT && HAVE_LRINTF)
+
+	/*
+	**	These defines enable functionality introduced with the 1999 ISO C
+	**	standard. They must be defined before the inclusion of math.h to
+	**	engage them. If optimisation is enabled, these functions will be
+	**	inlined. With optimisation switched off, you have to link in the
+	**	maths library using -lm.
+	*/
+
+	#define	_ISOC9X_SOURCE	1
+	#define _ISOC99_SOURCE	1
+
+	#define	__USE_ISOC9X	1
+	#define	__USE_ISOC99	1
+
+	#include	<math.h>
+
+#elif (defined (__CYGWIN__))
+
+	#include	<math.h>
+
+	#undef		HAVE_LRINT_REPLACEMENT
+	#define		HAVE_LRINT_REPLACEMENT	1
+
+	#undef	lrint
+	#undef	lrintf
+
+	#define	lrint	double2int
+	#define	lrintf	float2int
+
+	/*
+	**	The native CYGWIN lrint and lrintf functions are buggy:
+	**		http://sourceware.org/ml/cygwin/2005-06/msg00153.html
+	**		http://sourceware.org/ml/cygwin/2005-09/msg00047.html
+	**	and slow.
+	**	These functions (pulled from the Public Domain MinGW math.h header)
+	**	replace the native versions.
+	*/
+
+	static inline long double2int (double in)
+	{	long retval ;
+
+		__asm__ __volatile__
+		(	"fistpl %0"
+			: "=m" (retval)
+			: "t" (in)
+			: "st"
+			) ;
+
+		return retval ;
+	} /* double2int */
+
+	static inline long float2int (float in)
+	{	long retval ;
+
+		__asm__ __volatile__
+		(	"fistpl %0"
+			: "=m" (retval)
+			: "t" (in)
+			: "st"
+			) ;
+
+		return retval ;
+	} /* float2int */
+
+#elif (defined (WIN32) || defined (_WIN32))
+
+	#undef		HAVE_LRINT_REPLACEMENT
+	#define		HAVE_LRINT_REPLACEMENT	1
+
+	#include	<math.h>
+
+	/*
+	**	Win32 doesn't seem to have these functions.
+	**	Therefore implement inline versions of these functions here.
+	*/
+
+#ifdef _MSC_VER
+	__inline long int
+	lrint (double flt)
+	{	int intgr ;
+
+		_asm
+		{	fld flt
+			fistp intgr
+			} ;
+
+		return intgr ;
+	}
+
+	__inline long int
+	lrintf (float flt)
+	{	int intgr ;
+
+		_asm
+		{	fld flt
+			fistp intgr
+			} ;
+
+		return intgr ;
+	}
+#else
+	static __inline long int
+	lrint (double flt)
+	{
+		int intgr ;
+		__asm__ __volatile__ ("fldl %1; fistpl %0;" : "=m" (intgr) : "m" (flt));
+		return intgr ;
+	}
+
+	static __inline long int
+	lrintf (float flt)
+	{
+		int intgr ;
+
+		__asm__ __volatile__ ("flds %1; fistpl %0;" : "=m" (intgr) : "m" (flt));
+		return intgr ;
+	}
+#endif
+
+#elif (defined (__MWERKS__) && defined (macintosh))
+
+	/* This MacOS 9 solution was provided by Stephane Letz */
+
+	#undef		HAVE_LRINT_REPLACEMENT
+	#define		HAVE_LRINT_REPLACEMENT	1
+	#include	<math.h>
+
+	#undef	lrint
+	#undef	lrintf
+
+	#define	lrint	double2int
+	#define	lrintf	float2int
+
+	inline int
+	float2int (register float in)
+	{	long res [2] ;
+
+		asm
+		{	fctiw	in, in
+			stfd	 in, res
+		}
+		return res [1] ;
+	} /* float2int */
+
+	inline int
+	double2int (register double in)
+	{	long res [2] ;
+
+		asm
+		{	fctiw	in, in
+			stfd	 in, res
+		}
+		return res [1] ;
+	} /* double2int */
+
+#elif (defined (__MACH__) && defined (__APPLE__))
+
+	/* For Apple MacOSX. */
+
+	#undef		HAVE_LRINT_REPLACEMENT
+	#define		HAVE_LRINT_REPLACEMENT	1
+	#include	<math.h>
+
+	#undef lrint
+	#undef lrintf
+
+	#define lrint	double2int
+	#define lrintf	float2int
+
+	inline static long
+	float2int (register float in)
+	{	int res [2] ;
+
+		__asm__ __volatile__
+		(	"fctiw	%1, %1\n\t"
+			"stfd	%1, %0"
+			: "=m" (res)	/* Output */
+			: "f" (in)		/* Input */
+			: "memory"
+			) ;
+
+		return res [1] ;
+	} /* lrintf */
+
+	inline static long
+	double2int (register double in)
+	{	int res [2] ;
+
+		__asm__ __volatile__
+		(	"fctiw	%1, %1\n\t"
+			"stfd	%1, %0"
+			: "=m" (res)	/* Output */
+			: "f" (in)		/* Input */
+			: "memory"
+			) ;
+
+		return res [1] ;
+	} /* lrint */
+
+#else
+	#ifndef __sgi
+	#warning "Don't have the functions lrint() and lrintf()."
+	#warning "Replacing these functions with a standard C cast."
+	#endif
+
+	#include	<math.h>
+
+	#define	lrint(dbl)		((long) (dbl))
+	#define	lrintf(flt)		((long) (flt))
+
+#endif
+
+
+#endif /* FLOAT_CAST_HEADER */
+