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  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 1994-2015             *
  11.  * by the Xiph.Org Foundation https://xiph.org/                     *
  12.  *                                                                  *
  13.  ********************************************************************
  14.  
  15.  function: #ifdef jail to whip a few platforms into the UNIX ideal.
  16.  
  17.  ********************************************************************/
  18.  
  19. #ifdef HAVE_CONFIG_H
  20. #include "config.h"
  21. #endif
  22.  
  23. #include <math.h>
  24. #include <ogg/os_types.h>
  25.  
  26. #include "misc.h"
  27.  
  28. #ifndef _V_IFDEFJAIL_H_
  29. #  define _V_IFDEFJAIL_H_
  30.  
  31. #  ifdef __GNUC__
  32. #    define STIN static __inline__
  33. #  elif defined(_WIN32)
  34. #    define STIN static __inline
  35. #  else
  36. #    define STIN static
  37. #  endif
  38.  
  39. #ifdef DJGPP
  40. #  define rint(x)   (floor((x)+0.5f))
  41. #endif
  42.  
  43. #ifndef M_PI
  44. #  define M_PI (3.1415926536f)
  45. #endif
  46.  
  47. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  48. #  include <malloc.h>
  49. #  define rint(x)   (floor((x)+0.5f))
  50. #  define NO_FLOAT_MATH_LIB
  51. #  define FAST_HYPOT(a, b) sqrt((a)*(a) + (b)*(b))
  52. #endif
  53.  
  54. #if defined(__SYMBIAN32__) && defined(__WINS__)
  55. void *_alloca(size_t size);
  56. #  define alloca _alloca
  57. #endif
  58.  
  59. #ifndef FAST_HYPOT
  60. #  define FAST_HYPOT hypot
  61. #endif
  62.  
  63. #endif /* _V_IFDEFJAIL_H_ */
  64.  
  65. #ifdef HAVE_ALLOCA_H
  66. #  include <alloca.h>
  67. #endif
  68.  
  69. #ifdef USE_MEMORY_H
  70. #  include <memory.h>
  71. #endif
  72.  
  73. #ifndef min
  74. #  define min(x,y)  ((x)>(y)?(y):(x))
  75. #endif
  76.  
  77. #ifndef max
  78. #  define max(x,y)  ((x)<(y)?(y):(x))
  79. #endif
  80.  
  81.  
  82. /* Special i386 GCC implementation */
  83. #if defined(__i386__) && defined(__GNUC__) && !defined(__BEOS__) && !defined(__SSE2_MATH__)
  84. #  define VORBIS_FPU_CONTROL
  85. /* both GCC and MSVC are kinda stupid about rounding/casting to int.
  86.    Because of encapsulation constraints (GCC can't see inside the asm
  87.    block and so we end up doing stupid things like a store/load that
  88.    is collectively a noop), we do it this way */
  89.  
  90. /* we must set up the fpu before this works!! */
  91.  
  92. typedef ogg_int16_t vorbis_fpu_control;
  93.  
  94. static inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
  95.   ogg_int16_t ret;
  96.   ogg_int16_t temp;
  97.   __asm__ __volatile__("fnstcw %0\n\t"
  98.           "movw %0,%%dx\n\t"
  99.           "andw $62463,%%dx\n\t"
  100.           "movw %%dx,%1\n\t"
  101.           "fldcw %1\n\t":"=m"(ret):"m"(temp): "dx");
  102.   *fpu=ret;
  103. }
  104.  
  105. static inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
  106.   __asm__ __volatile__("fldcw %0":: "m"(fpu));
  107. }
  108.  
  109. /* assumes the FPU is in round mode! */
  110. static inline int vorbis_ftoi(double f){  /* yes, double!  Otherwise,
  111.                                              we get extra fst/fld to
  112.                                              truncate precision */
  113.   int i;
  114.   __asm__("fistl %0": "=m"(i) : "t"(f));
  115.   return(i);
  116. }
  117. #endif /* Special i386 GCC implementation */
  118.  
  119.  
  120. /* MSVC inline assembly. 32 bit only; inline ASM isn't implemented in the
  121.  * 64 bit compiler and doesn't work on arm. */
  122. #if defined(_MSC_VER) && defined(_M_IX86) && !defined(_WIN32_WCE)
  123. #  define VORBIS_FPU_CONTROL
  124.  
  125. typedef ogg_int16_t vorbis_fpu_control;
  126.  
  127. static __inline int vorbis_ftoi(double f){
  128.         int i;
  129.         __asm{
  130.                 fld f
  131.                 fistp i
  132.         }
  133.         return i;
  134. }
  135.  
  136. static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
  137.   (void)fpu;
  138. }
  139.  
  140. static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
  141.   (void)fpu;
  142. }
  143.  
  144. #endif /* Special MSVC 32 bit implementation */
  145.  
  146.  
  147. /* Optimized code path for x86_64 builds. Uses SSE2 intrinsics. This can be
  148.    done safely because all x86_64 CPUs supports SSE2. */
  149. #if (defined(_MSC_VER) && defined(_M_X64)) || (defined(__GNUC__) && defined (__SSE2_MATH__))
  150. #  define VORBIS_FPU_CONTROL
  151.  
  152. typedef ogg_int16_t vorbis_fpu_control;
  153.  
  154. #include <emmintrin.h>
  155. static __inline int vorbis_ftoi(double f){
  156.         return _mm_cvtsd_si32(_mm_load_sd(&f));
  157. }
  158.  
  159. static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
  160.   (void)fpu;
  161. }
  162.  
  163. static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
  164.   (void)fpu;
  165. }
  166.  
  167. #endif /* Special MSVC x64 implementation */
  168.  
  169.  
  170. /* If no special implementation was found for the current compiler / platform,
  171.    use the default implementation here: */
  172. #ifndef VORBIS_FPU_CONTROL
  173.  
  174. typedef int vorbis_fpu_control;
  175.  
  176. STIN int vorbis_ftoi(double f){
  177.         /* Note: MSVC and GCC (at least on some systems) round towards zero, thus,
  178.            the floor() call is required to ensure correct roudning of
  179.            negative numbers */
  180.         return (int)floor(f+.5);
  181. }
  182.  
  183. /* We don't have special code for this compiler/arch, so do it the slow way */
  184. #  define vorbis_fpu_setround(vorbis_fpu_control) {}
  185. #  define vorbis_fpu_restore(vorbis_fpu_control) {}
  186.  
  187. #endif /* default implementation */
  188.  
  189. #endif /* _OS_H */
  190.