ref: 7359de438cfaac829c4ed8b39fae9bb872fb5eea
dir: /sys/src/cmd/audio/libvorbis/os.h/
#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 https://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
#ifndef rint
#define rint(x) (floor((x)+0.5f))
#endif
#if defined(__SYMBIAN32__) && defined(__WINS__)
void *_alloca(size_t size);
# define alloca _alloca
#endif
#ifndef FAST_HYPOT
# define FAST_HYPOT hypot
#endif
#endif /* _V_IFDEFJAIL_H_ */
#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__) && !defined(__SSE2_MATH__)
# 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(_M_IX86) && !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){
(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(_M_X64)) || (defined(__GNUC__) && defined (__SSE2_MATH__))
# 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;
STIN 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 */