--- /dev/null
+#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 1994-2009 *
+ * by the Xiph.Org Foundation http://www.xiph.org/ *
+ * *
+ ********************************************************************
+
+ function: #ifdef jail to whip a few platforms into the UNIX ideal.
+ last mod: $Id: os.h 16227 2009-07-08 06:58:46Z xiphmont $
+
+ ********************************************************************/
+
+#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 _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 */
+#if defined(_MSC_VER) && !defined(_WIN64) && !defined(_WIN32_WCE)
+# 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){
+}
+
+static __inline void vorbis_fpu_restore(vorbis_fpu_control 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){
+}
+
+static __inline void vorbis_fpu_restore(vorbis_fpu_control 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 */
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