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#ifndef _OS_H

#define _OS_H

/********************************************************************

 *                                                                  *

 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *

 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *

 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *

 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *

 *                                                                  *

 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2015             *

 * by the Xiph.Org Foundation https://xiph.org/                     *

 *                                                                  *

 ********************************************************************

 function: #ifdef jail to whip a few platforms into the UNIX ideal.

 ********************************************************************/

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include 

#include 

#include "misc.h"

#ifndef _V_IFDEFJAIL_H_

#  define _V_IFDEFJAIL_H_

#  ifdef __GNUC__

#    define STIN static __inline__

#  elif defined(_WIN32)

#    define STIN static __inline

#  else

#    define STIN static

#  endif

#ifdef DJGPP

#  define rint(x)   (floor((x)+0.5f))

#endif

#ifndef M_PI

#  define M_PI (3.1415926536f)

#endif

#if defined(_WIN32) && !defined(__SYMBIAN32__)

#  include 

#  define rint(x)   (floor((x)+0.5f))

#  define NO_FLOAT_MATH_LIB

#  define FAST_HYPOT(a, b) sqrt((a)*(a) + (b)*(b))

#endif

#if defined(__SYMBIAN32__) && defined(__WINS__)

void *_alloca(size_t size);

#  define alloca _alloca

#endif

#ifndef FAST_HYPOT

#  define FAST_HYPOT hypot

#endif

#endif /* _V_IFDEFJAIL_H_ */

#ifdef HAVE_ALLOCA_H

#  include 

#endif

#ifdef USE_MEMORY_H

#  include 

#endif

#ifndef min

#  define min(x,y)  ((x)>(y)?(y):(x))

#endif

#ifndef max

#  define max(x,y)  ((x)<(y)?(y):(x))

#endif

/* Special i386 GCC implementation */

#if defined(__i386__) && defined(__GNUC__) && !defined(__BEOS__) && !defined(__SSE2_MATH__)

#  define VORBIS_FPU_CONTROL

/* both GCC and MSVC are kinda stupid about rounding/casting to int.

   Because of encapsulation constraints (GCC can't see inside the asm

   block and so we end up doing stupid things like a store/load that

   is collectively a noop), we do it this way */

/* we must set up the fpu before this works!! */

typedef ogg_int16_t vorbis_fpu_control;

static inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){

  ogg_int16_t ret;

  ogg_int16_t temp;

  __asm__ __volatile__("fnstcw %0\n\t"

          "movw %0,%%dx\n\t"

          "andw $62463,%%dx\n\t"

          "movw %%dx,%1\n\t"

          "fldcw %1\n\t":"=m"(ret):"m"(temp): "dx");

  *fpu=ret;

}

static inline void vorbis_fpu_restore(vorbis_fpu_control fpu){

  __asm__ __volatile__("fldcw %0":: "m"(fpu));

}

/* assumes the FPU is in round mode! */

static inline int vorbis_ftoi(double f){  /* yes, double!  Otherwise,

                                             we get extra fst/fld to

                                             truncate precision */

  int i;

  __asm__("fistl %0": "=m"(i) : "t"(f));

  return(i);

}

#endif /* Special i386 GCC implementation */

/* MSVC inline assembly. 32 bit only; inline ASM isn't implemented in the

 * 64 bit compiler and doesn't work on arm. */

#if defined(_MSC_VER) && defined(_M_IX86) && !defined(_WIN32_WCE)

#  define VORBIS_FPU_CONTROL

typedef ogg_int16_t vorbis_fpu_control;

static __inline int vorbis_ftoi(double f){

        int i;

        __asm{

                fld f

                fistp i

        }

        return i;

}

static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){

  (void)fpu;

}

static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){

  (void)fpu;

}

#endif /* Special MSVC 32 bit implementation */

/* Optimized code path for x86_64 builds. Uses SSE2 intrinsics. This can be

   done safely because all x86_64 CPUs supports SSE2. */

#if (defined(_MSC_VER) && defined(_M_X64)) || (defined(__GNUC__) && defined (__SSE2_MATH__))

#  define VORBIS_FPU_CONTROL

typedef ogg_int16_t vorbis_fpu_control;

#include 

static __inline int vorbis_ftoi(double f){

        return _mm_cvtsd_si32(_mm_load_sd(&f));

}

static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){

  (void)fpu;

}

static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){

  (void)fpu;

}

#endif /* Special MSVC x64 implementation */

/* If no special implementation was found for the current compiler / platform,

   use the default implementation here: */

#ifndef VORBIS_FPU_CONTROL

typedef int vorbis_fpu_control;

STIN int vorbis_ftoi(double f){

        /* Note: MSVC and GCC (at least on some systems) round towards zero, thus,

           the floor() call is required to ensure correct roudning of

           negative numbers */

        return (int)floor(f+.5);

}

/* We don't have special code for this compiler/arch, so do it the slow way */

#  define vorbis_fpu_setround(vorbis_fpu_control) {}

#  define vorbis_fpu_restore(vorbis_fpu_control) {}

#endif /* default implementation */

#endif /* _OS_H */