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annotate libs/vorbis/os.h @ 1:e7ca128b8713

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looks nice :)
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 02 Feb 2014 00:35:22 +0200
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nuclear@0 1 #ifndef _OS_H
nuclear@0 2 #define _OS_H
nuclear@0 3 /********************************************************************
nuclear@0 4 * *
nuclear@0 5 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
nuclear@0 6 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
nuclear@0 7 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
nuclear@0 8 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
nuclear@0 9 * *
nuclear@0 10 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
nuclear@0 11 * by the Xiph.Org Foundation http://www.xiph.org/ *
nuclear@0 12 * *
nuclear@0 13 ********************************************************************
nuclear@0 14
nuclear@0 15 function: #ifdef jail to whip a few platforms into the UNIX ideal.
nuclear@0 16 last mod: $Id: os.h 16227 2009-07-08 06:58:46Z xiphmont $
nuclear@0 17
nuclear@0 18 ********************************************************************/
nuclear@0 19
nuclear@0 20 #ifdef HAVE_CONFIG_H
nuclear@0 21 #include "config.h"
nuclear@0 22 #endif
nuclear@0 23
nuclear@0 24 #include <math.h>
nuclear@0 25 #include <ogg/os_types.h>
nuclear@0 26
nuclear@0 27 #include "misc.h"
nuclear@0 28
nuclear@0 29 #ifndef _V_IFDEFJAIL_H_
nuclear@0 30 # define _V_IFDEFJAIL_H_
nuclear@0 31
nuclear@0 32 # ifdef __GNUC__
nuclear@0 33 # define STIN static __inline__
nuclear@0 34 # elif _WIN32
nuclear@0 35 # define STIN static __inline
nuclear@0 36 # else
nuclear@0 37 # define STIN static
nuclear@0 38 # endif
nuclear@0 39
nuclear@0 40 #ifdef DJGPP
nuclear@0 41 # define rint(x) (floor((x)+0.5f))
nuclear@0 42 #endif
nuclear@0 43
nuclear@0 44 #ifndef M_PI
nuclear@0 45 # define M_PI (3.1415926536f)
nuclear@0 46 #endif
nuclear@0 47
nuclear@0 48 #if defined(_WIN32) && !defined(__SYMBIAN32__)
nuclear@0 49 # include <malloc.h>
nuclear@0 50 # define rint(x) (floor((x)+0.5f))
nuclear@0 51 # define NO_FLOAT_MATH_LIB
nuclear@0 52 # define FAST_HYPOT(a, b) sqrt((a)*(a) + (b)*(b))
nuclear@0 53 #endif
nuclear@0 54
nuclear@0 55 #if defined(__SYMBIAN32__) && defined(__WINS__)
nuclear@0 56 void *_alloca(size_t size);
nuclear@0 57 # define alloca _alloca
nuclear@0 58 #endif
nuclear@0 59
nuclear@0 60 #ifndef FAST_HYPOT
nuclear@0 61 # define FAST_HYPOT hypot
nuclear@0 62 #endif
nuclear@0 63
nuclear@0 64 #endif
nuclear@0 65
nuclear@0 66 #ifdef HAVE_ALLOCA_H
nuclear@0 67 # include <alloca.h>
nuclear@0 68 #endif
nuclear@0 69
nuclear@0 70 #ifdef USE_MEMORY_H
nuclear@0 71 # include <memory.h>
nuclear@0 72 #endif
nuclear@0 73
nuclear@0 74 #ifndef min
nuclear@0 75 # define min(x,y) ((x)>(y)?(y):(x))
nuclear@0 76 #endif
nuclear@0 77
nuclear@0 78 #ifndef max
nuclear@0 79 # define max(x,y) ((x)<(y)?(y):(x))
nuclear@0 80 #endif
nuclear@0 81
nuclear@0 82
nuclear@0 83 /* Special i386 GCC implementation */
nuclear@0 84 #if defined(__i386__) && defined(__GNUC__) && !defined(__BEOS__)
nuclear@0 85 # define VORBIS_FPU_CONTROL
nuclear@0 86 /* both GCC and MSVC are kinda stupid about rounding/casting to int.
nuclear@0 87 Because of encapsulation constraints (GCC can't see inside the asm
nuclear@0 88 block and so we end up doing stupid things like a store/load that
nuclear@0 89 is collectively a noop), we do it this way */
nuclear@0 90
nuclear@0 91 /* we must set up the fpu before this works!! */
nuclear@0 92
nuclear@0 93 typedef ogg_int16_t vorbis_fpu_control;
nuclear@0 94
nuclear@0 95 static inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
nuclear@0 96 ogg_int16_t ret;
nuclear@0 97 ogg_int16_t temp;
nuclear@0 98 __asm__ __volatile__("fnstcw %0\n\t"
nuclear@0 99 "movw %0,%%dx\n\t"
nuclear@0 100 "andw $62463,%%dx\n\t"
nuclear@0 101 "movw %%dx,%1\n\t"
nuclear@0 102 "fldcw %1\n\t":"=m"(ret):"m"(temp): "dx");
nuclear@0 103 *fpu=ret;
nuclear@0 104 }
nuclear@0 105
nuclear@0 106 static inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
nuclear@0 107 __asm__ __volatile__("fldcw %0":: "m"(fpu));
nuclear@0 108 }
nuclear@0 109
nuclear@0 110 /* assumes the FPU is in round mode! */
nuclear@0 111 static inline int vorbis_ftoi(double f){ /* yes, double! Otherwise,
nuclear@0 112 we get extra fst/fld to
nuclear@0 113 truncate precision */
nuclear@0 114 int i;
nuclear@0 115 __asm__("fistl %0": "=m"(i) : "t"(f));
nuclear@0 116 return(i);
nuclear@0 117 }
nuclear@0 118 #endif /* Special i386 GCC implementation */
nuclear@0 119
nuclear@0 120
nuclear@0 121 /* MSVC inline assembly. 32 bit only; inline ASM isn't implemented in the
nuclear@0 122 * 64 bit compiler */
nuclear@0 123 #if defined(_MSC_VER) && !defined(_WIN64) && !defined(_WIN32_WCE)
nuclear@0 124 # define VORBIS_FPU_CONTROL
nuclear@0 125
nuclear@0 126 typedef ogg_int16_t vorbis_fpu_control;
nuclear@0 127
nuclear@0 128 static __inline int vorbis_ftoi(double f){
nuclear@0 129 int i;
nuclear@0 130 __asm{
nuclear@0 131 fld f
nuclear@0 132 fistp i
nuclear@0 133 }
nuclear@0 134 return i;
nuclear@0 135 }
nuclear@0 136
nuclear@0 137 static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
nuclear@0 138 }
nuclear@0 139
nuclear@0 140 static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
nuclear@0 141 }
nuclear@0 142
nuclear@0 143 #endif /* Special MSVC 32 bit implementation */
nuclear@0 144
nuclear@0 145
nuclear@0 146 /* Optimized code path for x86_64 builds. Uses SSE2 intrinsics. This can be
nuclear@0 147 done safely because all x86_64 CPUs supports SSE2. */
nuclear@0 148 #if (defined(_MSC_VER) && defined(_WIN64)) || (defined(__GNUC__) && defined (__x86_64__))
nuclear@0 149 # define VORBIS_FPU_CONTROL
nuclear@0 150
nuclear@0 151 typedef ogg_int16_t vorbis_fpu_control;
nuclear@0 152
nuclear@0 153 #include <emmintrin.h>
nuclear@0 154 static __inline int vorbis_ftoi(double f){
nuclear@0 155 return _mm_cvtsd_si32(_mm_load_sd(&f));
nuclear@0 156 }
nuclear@0 157
nuclear@0 158 static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
nuclear@0 159 }
nuclear@0 160
nuclear@0 161 static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
nuclear@0 162 }
nuclear@0 163
nuclear@0 164 #endif /* Special MSVC x64 implementation */
nuclear@0 165
nuclear@0 166
nuclear@0 167 /* If no special implementation was found for the current compiler / platform,
nuclear@0 168 use the default implementation here: */
nuclear@0 169 #ifndef VORBIS_FPU_CONTROL
nuclear@0 170
nuclear@0 171 typedef int vorbis_fpu_control;
nuclear@0 172
nuclear@0 173 static int vorbis_ftoi(double f){
nuclear@0 174 /* Note: MSVC and GCC (at least on some systems) round towards zero, thus,
nuclear@0 175 the floor() call is required to ensure correct roudning of
nuclear@0 176 negative numbers */
nuclear@0 177 return (int)floor(f+.5);
nuclear@0 178 }
nuclear@0 179
nuclear@0 180 /* We don't have special code for this compiler/arch, so do it the slow way */
nuclear@0 181 # define vorbis_fpu_setround(vorbis_fpu_control) {}
nuclear@0 182 # define vorbis_fpu_restore(vorbis_fpu_control) {}
nuclear@0 183
nuclear@0 184 #endif /* default implementation */
nuclear@0 185
nuclear@0 186 #endif /* _OS_H */