cannam@86: #ifndef _OS_H
cannam@86: #define _OS_H
cannam@86: /********************************************************************
cannam@86:  *                                                                  *
cannam@86:  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
cannam@86:  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
cannam@86:  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
cannam@86:  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
cannam@86:  *                                                                  *
cannam@86:  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009             *
cannam@86:  * by the Xiph.Org Foundation http://www.xiph.org/                  *
cannam@86:  *                                                                  *
cannam@86:  ********************************************************************
cannam@86: 
cannam@86:  function: #ifdef jail to whip a few platforms into the UNIX ideal.
cannam@86:  last mod: $Id: os.h 16227 2009-07-08 06:58:46Z xiphmont $
cannam@86: 
cannam@86:  ********************************************************************/
cannam@86: 
cannam@86: #ifdef HAVE_CONFIG_H
cannam@86: #include "config.h"
cannam@86: #endif
cannam@86: 
cannam@86: #include <math.h>
cannam@86: #include <ogg/os_types.h>
cannam@86: 
cannam@86: #include "misc.h"
cannam@86: 
cannam@86: #ifndef _V_IFDEFJAIL_H_
cannam@86: #  define _V_IFDEFJAIL_H_
cannam@86: 
cannam@86: #  ifdef __GNUC__
cannam@86: #    define STIN static __inline__
cannam@86: #  elif _WIN32
cannam@86: #    define STIN static __inline
cannam@86: #  else
cannam@86: #    define STIN static
cannam@86: #  endif
cannam@86: 
cannam@86: #ifdef DJGPP
cannam@86: #  define rint(x)   (floor((x)+0.5f))
cannam@86: #endif
cannam@86: 
cannam@86: #ifndef M_PI
cannam@86: #  define M_PI (3.1415926536f)
cannam@86: #endif
cannam@86: 
cannam@86: #if defined(_WIN32) && !defined(__SYMBIAN32__)
cannam@86: #  include <malloc.h>
cannam@86: #  define rint(x)   (floor((x)+0.5f))
cannam@86: #  define NO_FLOAT_MATH_LIB
cannam@86: #  define FAST_HYPOT(a, b) sqrt((a)*(a) + (b)*(b))
cannam@86: #endif
cannam@86: 
cannam@86: #if defined(__SYMBIAN32__) && defined(__WINS__)
cannam@86: void *_alloca(size_t size);
cannam@86: #  define alloca _alloca
cannam@86: #endif
cannam@86: 
cannam@86: #ifndef FAST_HYPOT
cannam@86: #  define FAST_HYPOT hypot
cannam@86: #endif
cannam@86: 
cannam@86: #endif
cannam@86: 
cannam@86: #ifdef HAVE_ALLOCA_H
cannam@86: #  include <alloca.h>
cannam@86: #endif
cannam@86: 
cannam@86: #ifdef USE_MEMORY_H
cannam@86: #  include <memory.h>
cannam@86: #endif
cannam@86: 
cannam@86: #ifndef min
cannam@86: #  define min(x,y)  ((x)>(y)?(y):(x))
cannam@86: #endif
cannam@86: 
cannam@86: #ifndef max
cannam@86: #  define max(x,y)  ((x)<(y)?(y):(x))
cannam@86: #endif
cannam@86: 
cannam@86: 
cannam@86: /* Special i386 GCC implementation */
cannam@86: #if defined(__i386__) && defined(__GNUC__) && !defined(__BEOS__)
cannam@86: #  define VORBIS_FPU_CONTROL
cannam@86: /* both GCC and MSVC are kinda stupid about rounding/casting to int.
cannam@86:    Because of encapsulation constraints (GCC can't see inside the asm
cannam@86:    block and so we end up doing stupid things like a store/load that
cannam@86:    is collectively a noop), we do it this way */
cannam@86: 
cannam@86: /* we must set up the fpu before this works!! */
cannam@86: 
cannam@86: typedef ogg_int16_t vorbis_fpu_control;
cannam@86: 
cannam@86: static inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
cannam@86:   ogg_int16_t ret;
cannam@86:   ogg_int16_t temp;
cannam@86:   __asm__ __volatile__("fnstcw %0\n\t"
cannam@86:           "movw %0,%%dx\n\t"
cannam@86:           "andw $62463,%%dx\n\t"
cannam@86:           "movw %%dx,%1\n\t"
cannam@86:           "fldcw %1\n\t":"=m"(ret):"m"(temp): "dx");
cannam@86:   *fpu=ret;
cannam@86: }
cannam@86: 
cannam@86: static inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
cannam@86:   __asm__ __volatile__("fldcw %0":: "m"(fpu));
cannam@86: }
cannam@86: 
cannam@86: /* assumes the FPU is in round mode! */
cannam@86: static inline int vorbis_ftoi(double f){  /* yes, double!  Otherwise,
cannam@86:                                              we get extra fst/fld to
cannam@86:                                              truncate precision */
cannam@86:   int i;
cannam@86:   __asm__("fistl %0": "=m"(i) : "t"(f));
cannam@86:   return(i);
cannam@86: }
cannam@86: #endif /* Special i386 GCC implementation */
cannam@86: 
cannam@86: 
cannam@86: /* MSVC inline assembly. 32 bit only; inline ASM isn't implemented in the
cannam@86:  * 64 bit compiler */
cannam@86: #if defined(_MSC_VER) && !defined(_WIN64) && !defined(_WIN32_WCE)
cannam@86: #  define VORBIS_FPU_CONTROL
cannam@86: 
cannam@86: typedef ogg_int16_t vorbis_fpu_control;
cannam@86: 
cannam@86: static __inline int vorbis_ftoi(double f){
cannam@86:         int i;
cannam@86:         __asm{
cannam@86:                 fld f
cannam@86:                 fistp i
cannam@86:         }
cannam@86:         return i;
cannam@86: }
cannam@86: 
cannam@86: static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
cannam@86: }
cannam@86: 
cannam@86: static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
cannam@86: }
cannam@86: 
cannam@86: #endif /* Special MSVC 32 bit implementation */
cannam@86: 
cannam@86: 
cannam@86: /* Optimized code path for x86_64 builds. Uses SSE2 intrinsics. This can be
cannam@86:    done safely because all x86_64 CPUs supports SSE2. */
cannam@86: #if (defined(_MSC_VER) && defined(_WIN64)) || (defined(__GNUC__) && defined (__x86_64__))
cannam@86: #  define VORBIS_FPU_CONTROL
cannam@86: 
cannam@86: typedef ogg_int16_t vorbis_fpu_control;
cannam@86: 
cannam@86: #include <emmintrin.h>
cannam@86: static __inline int vorbis_ftoi(double f){
cannam@86:         return _mm_cvtsd_si32(_mm_load_sd(&f));
cannam@86: }
cannam@86: 
cannam@86: static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
cannam@86: }
cannam@86: 
cannam@86: static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
cannam@86: }
cannam@86: 
cannam@86: #endif /* Special MSVC x64 implementation */
cannam@86: 
cannam@86: 
cannam@86: /* If no special implementation was found for the current compiler / platform,
cannam@86:    use the default implementation here: */
cannam@86: #ifndef VORBIS_FPU_CONTROL
cannam@86: 
cannam@86: typedef int vorbis_fpu_control;
cannam@86: 
cannam@86: static int vorbis_ftoi(double f){
cannam@86:         /* Note: MSVC and GCC (at least on some systems) round towards zero, thus,
cannam@86:            the floor() call is required to ensure correct roudning of
cannam@86:            negative numbers */
cannam@86:         return (int)floor(f+.5);
cannam@86: }
cannam@86: 
cannam@86: /* We don't have special code for this compiler/arch, so do it the slow way */
cannam@86: #  define vorbis_fpu_setround(vorbis_fpu_control) {}
cannam@86: #  define vorbis_fpu_restore(vorbis_fpu_control) {}
cannam@86: 
cannam@86: #endif /* default implementation */
cannam@86: 
cannam@86: #endif /* _OS_H */