3 /********************************************************************
5 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
6 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
7 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
8 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
10 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
11 * by the XIPHOPHORUS Company http://www.xiph.org/ *
13 ********************************************************************
15 function: #ifdef jail to whip a few platforms into the UNIX ideal.
18 ********************************************************************/
25 #include <ogg/os_types.h>
29 #ifndef _V_IFDEFJAIL_H_
30 # define _V_IFDEFJAIL_H_
33 # define STIN static __inline__
35 # define STIN static __inline
41 # define rint(x) (floor((x)+0.5f))
45 # define M_PI (3.1415926536f)
50 # define rint(x) (floor((x)+0.5f))
51 # define NO_FLOAT_MATH_LIB
52 # define FAST_HYPOT(a, b) sqrt((a)*(a) + (b)*(b))
55 #if defined(__SYMBIAN32__) && defined(__WINS__)
56 void *_alloca(size_t size);
57 # define alloca _alloca
61 # define FAST_HYPOT hypot
75 # define min(x,y) ((x)>(y)?(y):(x))
79 # define max(x,y) ((x)<(y)?(y):(x))
82 #if defined(__i386__) && defined(__GNUC__) && !defined(__BEOS__)
83 # define VORBIS_FPU_CONTROL
84 /* both GCC and MSVC are kinda stupid about rounding/casting to int.
85 Because of encapsulation constraints (GCC can't see inside the asm
86 block and so we end up doing stupid things like a store/load that
87 is collectively a noop), we do it this way */
89 /* we must set up the fpu before this works!! */
91 typedef ogg_int16_t vorbis_fpu_control;
93 static inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
96 __asm__ __volatile__("fnstcw %0\n\t"
100 "fldcw %1\n\t":"=m"(ret):"m"(temp): "dx");
104 static inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
105 __asm__ __volatile__("fldcw %0":: "m"(fpu));
108 /* assumes the FPU is in round mode! */
109 static inline int vorbis_ftoi(double f){ /* yes, double! Otherwise,
110 we get extra fst/fld to
111 truncate precision */
113 __asm__("fistl %0": "=m"(i) : "t"(f));
119 #if defined(_WIN32) && !defined(__GNUC__) && !defined(__BORLANDC__)
120 # define VORBIS_FPU_CONTROL
122 typedef ogg_int16_t vorbis_fpu_control;
124 static __inline int vorbis_ftoi(double f){
133 static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
136 static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
142 #ifndef VORBIS_FPU_CONTROL
144 typedef int vorbis_fpu_control;
146 static int vorbis_ftoi(double f){
150 /* We don't have special code for this compiler/arch, so do it the slow way */
151 # define vorbis_fpu_setround(vorbis_fpu_control) {}
152 # define vorbis_fpu_restore(vorbis_fpu_control) {}