ref: 7dcc9bb727dae4e2010cdc6ef7cda101b05509a4
dir: /src/float_cast.h/
/*
** Copyright (c) 2001-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
** All rights reserved.
**
** This code is released under 2-clause BSD license. Please see the
** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING
*/
/* Version 1.5 */
#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 (WIN64) || defined(_WIN64))
/* Win64 section should be places before Win32 one, because
** most likely both WIN32 and WIN64 will be defined in 64-bit case.
*/
#include <math.h>
/* Win64 doesn't seem to have these functions, nor inline assembly.
** Therefore implement inline versions of these functions here.
*/
#include <emmintrin.h>
#include <mmintrin.h>
__inline long int
lrint(double flt)
{
return _mm_cvtsd_si32(_mm_load_sd(&flt));
}
__inline long int
lrintf(float flt)
{
return _mm_cvtss_si32(_mm_load_ss(&flt));
}
#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.
*/
__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 ;
}
#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 */