os.h 5.0 KB

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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 1994-2009 *
  11. * by the Xiph.Org Foundation http://www.xiph.org/ *
  12. * *
  13. ********************************************************************
  14. function: #ifdef jail to whip a few platforms into the UNIX ideal.
  15. last mod: $Id: os.h 19031 2013-12-03 19:20:50Z tterribe $
  16. ********************************************************************/
  17. #ifdef HAVE_CONFIG_H
  18. #include "config.h"
  19. #endif
  20. #include <math.h>
  21. #include <ogg/os_types.h>
  22. #include "misc.h"
  23. #ifndef _V_IFDEFJAIL_H_
  24. # define _V_IFDEFJAIL_H_
  25. # ifdef __GNUC__
  26. # define STIN static __inline__
  27. # elif _WIN32
  28. # define STIN static __inline
  29. # else
  30. # define STIN static
  31. # endif
  32. #ifdef DJGPP
  33. # define rint(x) (floor((x)+0.5f))
  34. #endif
  35. #ifndef M_PI
  36. # define M_PI (3.1415926536f)
  37. #endif
  38. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  39. # include <malloc.h>
  40. # define rint(x) (floor((x)+0.5f))
  41. # define NO_FLOAT_MATH_LIB
  42. # define FAST_HYPOT(a, b) sqrt((a)*(a) + (b)*(b))
  43. #endif
  44. #if defined(__SYMBIAN32__) && defined(__WINS__)
  45. void *_alloca(size_t size);
  46. # define alloca _alloca
  47. #endif
  48. #ifndef FAST_HYPOT
  49. # define FAST_HYPOT hypot
  50. #endif
  51. #endif
  52. #ifdef HAVE_ALLOCA_H
  53. # include <alloca.h>
  54. #endif
  55. #ifdef USE_MEMORY_H
  56. # include <memory.h>
  57. #endif
  58. #ifndef min
  59. # define min(x,y) ((x)>(y)?(y):(x))
  60. #endif
  61. #ifndef max
  62. # define max(x,y) ((x)<(y)?(y):(x))
  63. #endif
  64. /* Special i386 GCC implementation */
  65. #if defined(__i386__) && defined(__GNUC__) && !defined(__BEOS__)
  66. # define VORBIS_FPU_CONTROL
  67. /* both GCC and MSVC are kinda stupid about rounding/casting to int.
  68. Because of encapsulation constraints (GCC can't see inside the asm
  69. block and so we end up doing stupid things like a store/load that
  70. is collectively a noop), we do it this way */
  71. /* we must set up the fpu before this works!! */
  72. typedef ogg_int16_t vorbis_fpu_control;
  73. static inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
  74. ogg_int16_t ret;
  75. ogg_int16_t temp;
  76. __asm__ __volatile__("fnstcw %0\n\t"
  77. "movw %0,%%dx\n\t"
  78. "andw $62463,%%dx\n\t"
  79. "movw %%dx,%1\n\t"
  80. "fldcw %1\n\t":"=m"(ret):"m"(temp): "dx");
  81. *fpu=ret;
  82. }
  83. static inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
  84. __asm__ __volatile__("fldcw %0":: "m"(fpu));
  85. }
  86. /* assumes the FPU is in round mode! */
  87. static inline int vorbis_ftoi(double f){ /* yes, double! Otherwise,
  88. we get extra fst/fld to
  89. truncate precision */
  90. int i;
  91. __asm__("fistl %0": "=m"(i) : "t"(f));
  92. return(i);
  93. }
  94. #endif /* Special i386 GCC implementation */
  95. /* MSVC inline assembly. 32 bit only; inline ASM isn't implemented in the
  96. * 64 bit compiler */
  97. #if defined(_MSC_VER) && !defined(_WIN64) && !defined(_WIN32_WCE) && !defined(_M_ARM)
  98. # define VORBIS_FPU_CONTROL
  99. typedef ogg_int16_t vorbis_fpu_control;
  100. static __inline int vorbis_ftoi(double f){
  101. int i;
  102. __asm{
  103. fld f
  104. fistp i
  105. }
  106. return i;
  107. }
  108. static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
  109. (void)fpu;
  110. }
  111. static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
  112. (void)fpu;
  113. }
  114. #endif /* Special MSVC 32 bit implementation */
  115. /* Optimized code path for x86_64 builds. Uses SSE2 intrinsics. This can be
  116. done safely because all x86_64 CPUs supports SSE2. */
  117. #if (defined(_MSC_VER) && defined(_WIN64)) || (defined(__GNUC__) && defined (__x86_64__))
  118. # define VORBIS_FPU_CONTROL
  119. typedef ogg_int16_t vorbis_fpu_control;
  120. #include <emmintrin.h>
  121. static __inline int vorbis_ftoi(double f){
  122. return _mm_cvtsd_si32(_mm_load_sd(&f));
  123. }
  124. static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
  125. (void)fpu;
  126. }
  127. static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
  128. (void)fpu;
  129. }
  130. #endif /* Special MSVC x64 implementation */
  131. /* If no special implementation was found for the current compiler / platform,
  132. use the default implementation here: */
  133. #ifndef VORBIS_FPU_CONTROL
  134. typedef int vorbis_fpu_control;
  135. static int vorbis_ftoi(double f){
  136. /* Note: MSVC and GCC (at least on some systems) round towards zero, thus,
  137. the floor() call is required to ensure correct roudning of
  138. negative numbers */
  139. return (int)floor(f+.5);
  140. }
  141. /* We don't have special code for this compiler/arch, so do it the slow way */
  142. # define vorbis_fpu_setround(vorbis_fpu_control) {}
  143. # define vorbis_fpu_restore(vorbis_fpu_control) {}
  144. #endif /* default implementation */
  145. #endif /* _OS_H */