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/*
** Copyright (C) 2001 Erik de Castro Lopo <erikd AT mega-nerd DOT com>
**
** Permission to use, copy, modify, distribute, and sell this file for any
** purpose is hereby granted without fee, provided that the above copyright
** and this permission notice appear in all copies. No representations are
** made about the suitability of this software for any purpose. It is
** provided "as is" without express or implied warranty.
*/
/* Version 1.1 */
/*============================================================================
** 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) ;
*/
#ifndef __FLOAT_CAST_H__ // Added by JE - 30-11-2009
#define __FLOAT_CAST_H__
#if (defined (WIN32) || defined (_WIN32))
#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 ;
}
__inline long long int
llrint (double flt)
{ long long int intgr;
_asm
{ fld flt
fistp intgr
} ;
return intgr ;
}
__inline long long int
llrintf (float flt)
{ long long int intgr;
_asm
{ fld flt
fistp intgr
} ;
return intgr ;
}
#endif
#endif // __FLOAT_CAST_H__
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