1 #ifndef _OS_H
2 #define _OS_H
3 /********************************************************************
4 * *
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. *
9 * *
10 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2015 *
11 * by the Xiph.Org Foundation http://www.xiph.org/ *
12 * *
13 ********************************************************************
14
15 function: #ifdef jail to whip a few platforms into the UNIX ideal.
16
17 ********************************************************************/
18
19 #ifdef HAVE_CONFIG_H
20 #include "config.h"
21 #endif
22
23 #include <math.h>
24 #include <ogg/os_types.h>
25
26 #include "misc.h"
27
28 #ifndef _V_IFDEFJAIL_H_
29 # define _V_IFDEFJAIL_H_
30
31 # ifdef __GNUC__
32 # define STIN static __inline__
33 # elif defined(_WIN32)
34 # define STIN static __inline
35 # else
36 # define STIN static
37 # endif
38
39 #ifdef DJGPP
40 # define rint(x) (floor((x)+0.5f))
41 #endif
42
43 #ifndef M_PI
44 # define M_PI (3.1415926536f)
45 #endif
46
47 #if defined(_WIN32) && !defined(__SYMBIAN32__)
48 # include <malloc.h>
49 # define rint(x) (floor((x)+0.5f))
50 # define NO_FLOAT_MATH_LIB
51 # define FAST_HYPOT(a, b) sqrt((a)*(a) + (b)*(b))
52 #endif
53
54 #if defined(__SYMBIAN32__) && defined(__WINS__)
55 void *_alloca(size_t size);
56 # define alloca _alloca
57 #endif
58
59 #ifndef FAST_HYPOT
60 # define FAST_HYPOT hypot
61 #endif
62
63 #endif
64
65 #ifdef HAVE_ALLOCA_H
66 # include <alloca.h>
67 #endif
68
69 #ifdef USE_MEMORY_H
70 # include <memory.h>
71 #endif
72
73 #ifndef min
74 # define min(x,y) ((x)>(y)?(y):(x))
75 #endif
76
77 #ifndef max
78 # define max(x,y) ((x)<(y)?(y):(x))
79 #endif
80
81
82 /* Special i386 GCC implementation */
83 #if defined(__i386__) && defined(__GNUC__) && !defined(__BEOS__)
84 # define VORBIS_FPU_CONTROL
85 /* both GCC and MSVC are kinda stupid about rounding/casting to int.
86 Because of encapsulation constraints (GCC can't see inside the asm
87 block and so we end up doing stupid things like a store/load that
88 is collectively a noop), we do it this way */
89
90 /* we must set up the fpu before this works!! */
91
92 typedef ogg_int16_t vorbis_fpu_control;
93
vorbis_fpu_setround(vorbis_fpu_control * fpu)94 static inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
95 ogg_int16_t ret;
96 ogg_int16_t temp;
97 __asm__ __volatile__("fnstcw %0\n\t"
98 "movw %0,%%dx\n\t"
99 "andw $62463,%%dx\n\t"
100 "movw %%dx,%1\n\t"
101 "fldcw %1\n\t":"=m"(ret):"m"(temp): "dx");
102 *fpu=ret;
103 }
104
vorbis_fpu_restore(vorbis_fpu_control fpu)105 static inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
106 __asm__ __volatile__("fldcw %0":: "m"(fpu));
107 }
108
109 /* assumes the FPU is in round mode! */
vorbis_ftoi(double f)110 static inline int vorbis_ftoi(double f){ /* yes, double! Otherwise,
111 we get extra fst/fld to
112 truncate precision */
113 int i;
114 __asm__("fistl %0": "=m"(i) : "t"(f));
115 return(i);
116 }
117 #endif /* Special i386 GCC implementation */
118
119
120 /* MSVC inline assembly. 32 bit only; inline ASM isn't implemented in the
121 * 64 bit compiler and doesn't work on arm. */
122 #if defined(_MSC_VER) && !defined(_WIN64) && \
123 !defined(_WIN32_WCE) && !defined(_M_ARM)
124 # define VORBIS_FPU_CONTROL
125
126 typedef ogg_int16_t vorbis_fpu_control;
127
vorbis_ftoi(double f)128 static __inline int vorbis_ftoi(double f){
129 int i;
130 __asm{
131 fld f
132 fistp i
133 }
134 return i;
135 }
136
vorbis_fpu_setround(vorbis_fpu_control * fpu)137 static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
138 (void)fpu;
139 }
140
vorbis_fpu_restore(vorbis_fpu_control fpu)141 static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
142 (void)fpu;
143 }
144
145 #endif /* Special MSVC 32 bit implementation */
146
147
148 /* Optimized code path for x86_64 builds. Uses SSE2 intrinsics. This can be
149 done safely because all x86_64 CPUs supports SSE2. */
150 #if (defined(_MSC_VER) && defined(_WIN64)) || (defined(__GNUC__) && defined (__x86_64__))
151 # define VORBIS_FPU_CONTROL
152
153 typedef ogg_int16_t vorbis_fpu_control;
154
155 #include <emmintrin.h>
vorbis_ftoi(double f)156 static __inline int vorbis_ftoi(double f){
157 return _mm_cvtsd_si32(_mm_load_sd(&f));
158 }
159
vorbis_fpu_setround(vorbis_fpu_control * fpu)160 static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
161 (void)fpu;
162 }
163
vorbis_fpu_restore(vorbis_fpu_control fpu)164 static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
165 (void)fpu;
166 }
167
168 #endif /* Special MSVC x64 implementation */
169
170
171 /* If no special implementation was found for the current compiler / platform,
172 use the default implementation here: */
173 #ifndef VORBIS_FPU_CONTROL
174
175 typedef int vorbis_fpu_control;
176
vorbis_ftoi(double f)177 static int vorbis_ftoi(double f){
178 /* Note: MSVC and GCC (at least on some systems) round towards zero, thus,
179 the floor() call is required to ensure correct roudning of
180 negative numbers */
181 return (int)floor(f+.5);
182 }
183
184 /* We don't have special code for this compiler/arch, so do it the slow way */
185 # define vorbis_fpu_setround(vorbis_fpu_control) {}
186 # define vorbis_fpu_restore(vorbis_fpu_control) {}
187
188 #endif /* default implementation */
189
190 #endif /* _OS_H */
191