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os.h (3900B)
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1 /* Hacked vx32 version of libvorbis's os.h.
2 * What libvorbis really should do is use C99's fenv.h facility,
3 * based on something like a HAVE_FENV_H configure setting.
4 */
5 #ifndef _OS_H
6 #define _OS_H
7 /********************************************************************
8 * *
9 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
10 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
11 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
12 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
13 * *
14 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
15 * by the XIPHOPHORUS Company http://www.xiph.org/ *
16 * *
17 ********************************************************************
18
19 function: #ifdef jail to whip a few platforms into the UNIX ideal.
20 last mod: $Id: os.h 1919 2005-07-24 14:18:04Z baford $
21
22 ********************************************************************/
23
24 #include <math.h>
25 #include <ogg/os_types.h>
26
27 #include "libvorbis/lib/misc.h" // XXX vx32
28
29 #ifndef _V_IFDEFJAIL_H_
30 # define _V_IFDEFJAIL_H_
31
32 # ifdef __GNUC__
33 # define STIN static __inline__
34 # elif _WIN32
35 # define STIN static __inline
36 # else
37 # define STIN static
38 # endif
39
40 #ifdef DJGPP
41 # define rint(x) (floor((x)+0.5f))
42 #endif
43
44 #ifndef M_PI
45 # define M_PI (3.1415926536f)
46 #endif
47
48 #ifdef _WIN32
49 # include <malloc.h>
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))
53 #endif
54
55 #ifndef FAST_HYPOT
56 # define FAST_HYPOT hypot
57 #endif
58
59 #endif
60
61 #ifdef HAVE_ALLOCA_H
62 # include <alloca.h>
63 #endif
64
65 #ifdef USE_MEMORY_H
66 # include <memory.h>
67 #endif
68
69 #ifndef min
70 # define min(x,y) ((x)>(y)?(y):(x))
71 #endif
72
73 #ifndef max
74 # define max(x,y) ((x)<(y)?(y):(x))
75 #endif
76
77 #if 0 // XXX vx32
78 #if defined(__i386__) && defined(__GNUC__) && !defined(__BEOS__)
79 # define VORBIS_FPU_CONTROL
80 /* both GCC and MSVC are kinda stupid about rounding/casting to int.
81 Because of encapsulation constraints (GCC can't see inside the asm
82 block and so we end up doing stupid things like a store/load that
83 is collectively a noop), we do it this way */
84
85 /* we must set up the fpu before this works!! */
86
87 typedef ogg_int16_t vorbis_fpu_control;
88
89 static inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
90 ogg_int16_t ret;
91 ogg_int16_t temp;
92 __asm__ __volatile__("fnstcw %0\n\t"
93 "movw %0,%%dx\n\t"
94 "orw $62463,%%dx\n\t"
95 "movw %%dx,%1\n\t"
96 "fldcw %1\n\t":"=m"(ret):"m"(temp): "dx");
97 *fpu=ret;
98 }
99
100 static inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
101 __asm__ __volatile__("fldcw %0":: "m"(fpu));
102 }
103
104 /* assumes the FPU is in round mode! */
105 static inline int vorbis_ftoi(double f){ /* yes, double! Otherwise,
106 we get extra fst/fld to
107 truncate precision */
108 int i;
109 __asm__("fistl %0": "=m"(i) : "t"(f));
110 return(i);
111 }
112 #endif
113
114
115 #if defined(_WIN32) && !defined(__GNUC__) && !defined(__BORLANDC__)
116 # define VORBIS_FPU_CONTROL
117
118 typedef ogg_int16_t vorbis_fpu_control;
119
120 static __inline int vorbis_ftoi(double f){
121 int i;
122 __asm{
123 fld f
124 fistp i
125 }
126 return i;
127 }
128
129 static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
130 }
131
132 static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
133 }
134
135 #endif
136 #endif // XXX vx32
137
138
139 #ifndef VORBIS_FPU_CONTROL
140
141 typedef int vorbis_fpu_control;
142
143 static int vorbis_ftoi(double f){
144 return (int)(f);
145 }
146
147 /* We don't have special code for this compiler/arch, so do it the slow way */
148 # define vorbis_fpu_setround(vorbis_fpu_control) {}
149 # define vorbis_fpu_restore(vorbis_fpu_control) {}
150
151 #endif
152
153 #endif /* _OS_H */