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__) 56void *_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 93typedef ogg_int16_t vorbis_fpu_control; 94 95static 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 106static 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! */ 111static 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 126typedef ogg_int16_t vorbis_fpu_control; 127 128static __inline int vorbis_ftoi(double f){ 129 int i; 130 __asm{ 131 fld f 132 fistp i 133 } 134 return i; 135} 136 137static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){ 138} 139 140static __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 151typedef ogg_int16_t vorbis_fpu_control; 152 153#include <emmintrin.h> 154static __inline int vorbis_ftoi(double f){ 155 return _mm_cvtsd_si32(_mm_load_sd(&f)); 156} 157 158static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){ 159} 160 161static __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 171typedef int vorbis_fpu_control; 172 173static 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