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 */ 187