ref: 2d221e61e3820a007ff2204adb73ad3ab27010c6
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 http://www.xiph.org/ * * * ******************************************************************** function: #ifdef jail to whip a few platforms into the UNIX ideal. last mod: $Id: os.h 19457 2015-03-03 00:15:29Z giles $ ********************************************************************/ #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 #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 #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 */