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Diffstat (limited to 'vorbis/lib/os.h')
| -rw-r--r-- | vorbis/lib/os.h | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/vorbis/lib/os.h b/vorbis/lib/os.h new file mode 100644 index 0000000..416a401 --- /dev/null +++ b/vorbis/lib/os.h @@ -0,0 +1,190 @@ +#ifndef _OS_H +#define _OS_H +/******************************************************************** + * * + * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. * + * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * + * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * + * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * + * * + * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2015 * + * by the Xiph.Org Foundation http://www.xiph.org/ * + * * + ******************************************************************** + + function: #ifdef jail to whip a few platforms into the UNIX ideal. + + ********************************************************************/ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <math.h> +#include <ogg/os_types.h> + +#include "misc.h" + +#ifndef _V_IFDEFJAIL_H_ +# define _V_IFDEFJAIL_H_ + +# ifdef __GNUC__ +# define STIN static __inline__ +# elif defined(_WIN32) +# define STIN static __inline +# else +# define STIN static +# endif + +#ifdef DJGPP +# define rint(x) (floor((x)+0.5f)) +#endif + +#ifndef M_PI +# define M_PI (3.1415926536f) +#endif + +#if defined(_WIN32) && !defined(__SYMBIAN32__) +# include <malloc.h> +# define rint(x) (floor((x)+0.5f)) +# define NO_FLOAT_MATH_LIB +# define FAST_HYPOT(a, b) sqrt((a)*(a) + (b)*(b)) +#endif + +#if defined(__SYMBIAN32__) && defined(__WINS__) +void *_alloca(size_t size); +# define alloca _alloca +#endif + +#ifndef FAST_HYPOT +# define FAST_HYPOT hypot +#endif + +#endif + +#ifdef HAVE_ALLOCA_H +# include <alloca.h> +#endif + +#ifdef USE_MEMORY_H +# include <memory.h> +#endif + +#ifndef min +# define min(x,y) ((x)>(y)?(y):(x)) +#endif + +#ifndef max +# define max(x,y) ((x)<(y)?(y):(x)) +#endif + + +/* Special i386 GCC implementation */ +#if defined(__i386__) && defined(__GNUC__) && !defined(__BEOS__) +# define VORBIS_FPU_CONTROL +/* both GCC and MSVC are kinda stupid about rounding/casting to int. + Because of encapsulation constraints (GCC can't see inside the asm + block and so we end up doing stupid things like a store/load that + is collectively a noop), we do it this way */ + +/* we must set up the fpu before this works!! */ + +typedef ogg_int16_t vorbis_fpu_control; + +static inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){ + ogg_int16_t ret; + ogg_int16_t temp; + __asm__ __volatile__("fnstcw %0\n\t" + "movw %0,%%dx\n\t" + "andw $62463,%%dx\n\t" + "movw %%dx,%1\n\t" + "fldcw %1\n\t":"=m"(ret):"m"(temp): "dx"); + *fpu=ret; +} + +static inline void vorbis_fpu_restore(vorbis_fpu_control fpu){ + __asm__ __volatile__("fldcw %0":: "m"(fpu)); +} + +/* assumes the FPU is in round mode! */ +static inline int vorbis_ftoi(double f){ /* yes, double! Otherwise, + we get extra fst/fld to + truncate precision */ + int i; + __asm__("fistl %0": "=m"(i) : "t"(f)); + return(i); +} +#endif /* Special i386 GCC implementation */ + + +/* MSVC inline assembly. 32 bit only; inline ASM isn't implemented in the + * 64 bit compiler and doesn't work on arm. */ +#if defined(_MSC_VER) && !defined(_WIN64) && \ + !defined(_WIN32_WCE) && !defined(_M_ARM) +# define VORBIS_FPU_CONTROL + +typedef ogg_int16_t vorbis_fpu_control; + +static __inline int vorbis_ftoi(double f){ + int i; + __asm{ + fld f + fistp i + } + return i; +} + +static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){ + (void)fpu; +} + +static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){ + (void)fpu; +} + +#endif /* Special MSVC 32 bit implementation */ + + +/* Optimized code path for x86_64 builds. Uses SSE2 intrinsics. This can be + done safely because all x86_64 CPUs supports SSE2. */ +#if (defined(_MSC_VER) && defined(_WIN64)) || (defined(__GNUC__) && defined (__x86_64__)) +# define VORBIS_FPU_CONTROL + +typedef ogg_int16_t vorbis_fpu_control; + +#include <emmintrin.h> +static __inline int vorbis_ftoi(double f){ + return _mm_cvtsd_si32(_mm_load_sd(&f)); +} + +static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){ + (void)fpu; +} + +static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){ + (void)fpu; +} + +#endif /* Special MSVC x64 implementation */ + + +/* If no special implementation was found for the current compiler / platform, + use the default implementation here: */ +#ifndef VORBIS_FPU_CONTROL + +typedef int vorbis_fpu_control; + +static int vorbis_ftoi(double f){ + /* Note: MSVC and GCC (at least on some systems) round towards zero, thus, + the floor() call is required to ensure correct roudning of + negative numbers */ + return (int)floor(f+.5); +} + +/* We don't have special code for this compiler/arch, so do it the slow way */ +# define vorbis_fpu_setround(vorbis_fpu_control) {} +# define vorbis_fpu_restore(vorbis_fpu_control) {} + +#endif /* default implementation */ + +#endif /* _OS_H */ |