156 lines
3.9 KiB
C
156 lines
3.9 KiB
C
#ifndef _OS_H
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#define _OS_H
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/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
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* by the XIPHOPHORUS Company http://www.xiph.org/ *
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* *
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********************************************************************
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function: #ifdef jail to whip a few platforms into the UNIX ideal.
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last mod: $Id: os.h 7543 2004-08-13 01:48:19Z conrad $
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********************************************************************/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <math.h>
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#include <ogg/os_types.h>
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#include "misc.h"
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#ifndef _V_IFDEFJAIL_H_
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# define _V_IFDEFJAIL_H_
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# ifdef __GNUC__
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# define STIN static __inline__
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# elif _WIN32
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# define STIN static __inline
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# else
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# define STIN static
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# endif
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#ifdef DJGPP
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# define rint(x) (floor((x)+0.5f))
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#endif
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#ifndef M_PI
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# define M_PI (3.1415926536f)
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#endif
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#if defined(_WIN32) && !defined(__SYMBIAN32__)
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# include <malloc.h>
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# define rint(x) (floor((x)+0.5f))
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# define NO_FLOAT_MATH_LIB
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# define FAST_HYPOT(a, b) sqrt((a)*(a) + (b)*(b))
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#endif
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#if defined(__SYMBIAN32__) && defined(__WINS__)
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void *_alloca(size_t size);
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# define alloca _alloca
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#endif
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#ifndef FAST_HYPOT
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# define FAST_HYPOT hypot
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#endif
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#endif
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#ifdef HAVE_ALLOCA_H
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# include <alloca.h>
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#endif
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#ifdef USE_MEMORY_H
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# include <memory.h>
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#endif
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#ifndef min
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# define min(x,y) ((x)>(y)?(y):(x))
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#endif
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#ifndef max
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# define max(x,y) ((x)<(y)?(y):(x))
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#endif
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#if defined(__i386__) && defined(__GNUC__) && !defined(__BEOS__)
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# define VORBIS_FPU_CONTROL
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/* both GCC and MSVC are kinda stupid about rounding/casting to int.
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Because of encapsulation constraints (GCC can't see inside the asm
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block and so we end up doing stupid things like a store/load that
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is collectively a noop), we do it this way */
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/* we must set up the fpu before this works!! */
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typedef ogg_int16_t vorbis_fpu_control;
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static inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
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ogg_int16_t ret;
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ogg_int16_t temp;
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__asm__ __volatile__("fnstcw %0\n\t"
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"movw %0,%%dx\n\t"
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"orw $62463,%%dx\n\t"
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"movw %%dx,%1\n\t"
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"fldcw %1\n\t":"=m"(ret):"m"(temp): "dx");
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*fpu=ret;
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}
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static inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
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__asm__ __volatile__("fldcw %0":: "m"(fpu));
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}
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/* assumes the FPU is in round mode! */
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static inline int vorbis_ftoi(double f){ /* yes, double! Otherwise,
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we get extra fst/fld to
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truncate precision */
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int i;
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__asm__("fistl %0": "=m"(i) : "t"(f));
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return(i);
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}
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#endif
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#if defined(_WIN32) && !defined(__GNUC__) && !defined(__BORLANDC__)
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# define VORBIS_FPU_CONTROL
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typedef ogg_int16_t vorbis_fpu_control;
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static __inline int vorbis_ftoi(double f){
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int i;
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__asm{
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fld f
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fistp i
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}
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return i;
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}
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static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
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}
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static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
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}
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#endif
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#ifndef VORBIS_FPU_CONTROL
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typedef int vorbis_fpu_control;
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static int vorbis_ftoi(double f){
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return (int)(f+.5);
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}
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/* We don't have special code for this compiler/arch, so do it the slow way */
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# define vorbis_fpu_setround(vorbis_fpu_control) {}
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# define vorbis_fpu_restore(vorbis_fpu_control) {}
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#endif
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#endif /* _OS_H */
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