release/src/router/libvorbis/lib/os.h

   1 #ifndef _OS_H
   2 #define _OS_H
   3 /********************************************************************
   4  *                                                                  *
   5  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
   6  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   7  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   8  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   9  *                                                                  *
  10  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009             *
  11  * by the Xiph.Org Foundation http://www.xiph.org/                  *
  12  *                                                                  *
  13  ********************************************************************
  14
  15  function: #ifdef jail to whip a few platforms into the UNIX ideal.
  16  last mod: $Id: os.h 16227 2009-07-08 06:58:46Z xiphmont $
  17
  18  ********************************************************************/
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include <math.h>
  25 #include <ogg/os_types.h>
  26
  27 #include "misc.h"
  28
  29 #ifndef _V_IFDEFJAIL_H_
  30 #  define _V_IFDEFJAIL_H_
  31
  32 #  ifdef __GNUC__
  33 #    define STIN static __inline__
  34 #  elif _WIN32
  35 #    define STIN static __inline
  36 #  else
  37 #    define STIN static
  38 #  endif
  39
  40 #ifdef DJGPP
  41 #  define rint(x)   (floor((x)+0.5f))
  42 #endif
  43
  44 #ifndef M_PI
  45 #  define M_PI (3.1415926536f)
  46 #endif
  47
  48 #if defined(_WIN32) && !defined(__SYMBIAN32__)
  49 #  include <malloc.h>
  50 #  define rint(x)   (floor((x)+0.5f))
  51 #  define NO_FLOAT_MATH_LIB
  52 #  define FAST_HYPOT(a, b) sqrt((a)*(a) + (b)*(b))
  53 #endif
  54
  55 #if defined(__SYMBIAN32__) && defined(__WINS__)
  56 void *_alloca(size_t size);
  57 #  define alloca _alloca
  58 #endif
  59
  60 #ifndef FAST_HYPOT
  61 #  define FAST_HYPOT hypot
  62 #endif
  63
  64 #endif
  65
  66 #ifdef HAVE_ALLOCA_H
  67 #  include <alloca.h>
  68 #endif
  69
  70 #ifdef USE_MEMORY_H
  71 #  include <memory.h>
  72 #endif
  73
  74 #ifndef min
  75 #  define min(x,y)  ((x)>(y)?(y):(x))
  76 #endif
  77
  78 #ifndef max
  79 #  define max(x,y)  ((x)<(y)?(y):(x))
  80 #endif
  81
  82
  83 /* Special i386 GCC implementation */
  84 #if defined(__i386__) && defined(__GNUC__) && !defined(__BEOS__)
  85 #  define VORBIS_FPU_CONTROL
  86 /* both GCC and MSVC are kinda stupid about rounding/casting to int.
  87    Because of encapsulation constraints (GCC can't see inside the asm
  88    block and so we end up doing stupid things like a store/load that
  89    is collectively a noop), we do it this way */
  90
  91 /* we must set up the fpu before this works!! */
  92
  93 typedef ogg_int16_t vorbis_fpu_control;
  94
  95 static inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
  96   ogg_int16_t ret;
  97   ogg_int16_t temp;
  98   __asm__ __volatile__("fnstcw %0\n\t"
  99           "movw %0,%%dx\n\t"
 100           "andw $62463,%%dx\n\t"
 101           "movw %%dx,%1\n\t"
 102           "fldcw %1\n\t":"=m"(ret):"m"(temp): "dx");
 103   *fpu=ret;
 104 }
 105
 106 static inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
 107   __asm__ __volatile__("fldcw %0":: "m"(fpu));
 108 }
 109
 110 /* assumes the FPU is in round mode! */
 111 static inline int vorbis_ftoi(double f){  /* yes, double!  Otherwise,
 112                                              we get extra fst/fld to
 113                                              truncate precision */
 114   int i;
 115   __asm__("fistl %0": "=m"(i) : "t"(f));
 116   return(i);
 117 }
 118 #endif /* Special i386 GCC implementation */
 119
 120
 121 /* MSVC inline assembly. 32 bit only; inline ASM isn't implemented in the
 122  * 64 bit compiler */
 123 #if defined(_MSC_VER) && !defined(_WIN64) && !defined(_WIN32_WCE)
 124 #  define VORBIS_FPU_CONTROL
 125
 126 typedef ogg_int16_t vorbis_fpu_control;
 127
 128 static __inline int vorbis_ftoi(double f){
 129         int i;
 130         __asm{
 131                 fld f
 132                 fistp i
 133         }
 134         return i;
 135 }
 136
 137 static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
 138 }
 139
 140 static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
 141 }
 142
 143 #endif /* Special MSVC 32 bit implementation */
 144
 145
 146 /* Optimized code path for x86_64 builds. Uses SSE2 intrinsics. This can be
 147    done safely because all x86_64 CPUs supports SSE2. */
 148 #if (defined(_MSC_VER) && defined(_WIN64)) || (defined(__GNUC__) && defined (__x86_64__))
 149 #  define VORBIS_FPU_CONTROL
 150
 151 typedef ogg_int16_t vorbis_fpu_control;
 152
 153 #include <emmintrin.h>
 154 static __inline int vorbis_ftoi(double f){
 155         return _mm_cvtsd_si32(_mm_load_sd(&f));
 156 }
 157
 158 static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
 159 }
 160
 161 static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
 162 }
 163
 164 #endif /* Special MSVC x64 implementation */
 165
 166
 167 /* If no special implementation was found for the current compiler / platform,
 168    use the default implementation here: */
 169 #ifndef VORBIS_FPU_CONTROL
 170
 171 typedef int vorbis_fpu_control;
 172
 173 static int vorbis_ftoi(double f){
 174         /* Note: MSVC and GCC (at least on some systems) round towards zero, thus,
 175            the floor() call is required to ensure correct roudning of
 176            negative numbers */
 177         return (int)floor(f+.5);
 178 }
 179
 180 /* We don't have special code for this compiler/arch, so do it the slow way */
 181 #  define vorbis_fpu_setround(vorbis_fpu_control) {}
 182 #  define vorbis_fpu_restore(vorbis_fpu_control) {}
 183
 184 #endif /* default implementation */
 185
 186 #endif /* _OS_H */