1 /*
2 * Copyright (c) 2002 Fabrice Bellard
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef AVUTIL_MEM_INTERNAL_H
22 #define AVUTIL_MEM_INTERNAL_H
23
24 #include "config.h"
25
26 #include <stdint.h>
27
30
31 /**
32 * @def DECLARE_ALIGNED(n,t,v)
33 * Declare a variable that is aligned in memory.
34 *
35 * @code{.c}
36 * DECLARE_ALIGNED(16, uint16_t, aligned_int) = 42;
37 * DECLARE_ALIGNED(32, uint8_t, aligned_array)[128];
38 *
39 * // The default-alignment equivalent would be
40 * uint16_t aligned_int = 42;
41 * uint8_t aligned_array[128];
42 * @endcode
43 *
44 * @param n Minimum alignment in bytes
45 * @param t Type of the variable (or array element)
46 * @param v Name of the variable
47 */
48
49 /**
50 * @def DECLARE_ASM_ALIGNED(n,t,v)
51 * Declare an aligned variable appropriate for use in inline assembly code.
52 *
53 * @code{.c}
54 * DECLARE_ASM_ALIGNED(16, uint64_t, pw_08) = UINT64_C(0x0008000800080008);
55 * @endcode
56 *
57 * @param n Minimum alignment in bytes
58 * @param t Type of the variable (or array element)
59 * @param v Name of the variable
60 */
61
62 /**
63 * @def DECLARE_ASM_CONST(n,t,v)
64 * Declare a static constant aligned variable appropriate for use in inline
65 * assembly code.
66 *
67 * @code{.c}
68 * DECLARE_ASM_CONST(16, uint64_t, pw_08) = UINT64_C(0x0008000800080008);
69 * @endcode
70 *
71 * @param n Minimum alignment in bytes
72 * @param t Type of the variable (or array element)
73 * @param v Name of the variable
74 */
75
76 #if defined(__INTEL_COMPILER) && __INTEL_COMPILER < 1110 || defined(__SUNPRO_C)
77 #define DECLARE_ALIGNED_T(n,t,v) t __attribute__ ((aligned (n))) v
78 #define DECLARE_ASM_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
79 #define DECLARE_ASM_CONST(n,t,v) const t __attribute__ ((aligned (n))) v
80 #elif defined(__DJGPP__)
81 #define DECLARE_ALIGNED_T(n,t,v) t __attribute__ ((aligned (FFMIN(n, 16)))) v
82 #define DECLARE_ASM_ALIGNED(n,t,v) t av_used __attribute__ ((aligned (FFMIN(n, 16)))) v
83 #define DECLARE_ASM_CONST(n,t,v) static const t av_used __attribute__ ((aligned (FFMIN(n, 16)))) v
84 #elif defined(__GNUC__) || defined(__clang__)
85 #define DECLARE_ALIGNED_T(n,t,v) t __attribute__ ((aligned (n))) v
86 #define DECLARE_ASM_ALIGNED(n,t,v) t av_used __attribute__ ((aligned (n))) v
87 #define DECLARE_ASM_CONST(n,t,v) static const t av_used __attribute__ ((aligned (n))) v
88 #elif defined(_MSC_VER)
89 #define DECLARE_ALIGNED_T(n,t,v) __declspec(align(n)) t v
90 #define DECLARE_ASM_ALIGNED(n,t,v) __declspec(align(n)) t v
91 #define DECLARE_ASM_CONST(n,t,v) __declspec(align(n)) static const t v
92 #else
93 #define DECLARE_ALIGNED_T(n,t,v) t v
94 #define DECLARE_ASM_ALIGNED(n,t,v) t v
95 #define DECLARE_ASM_CONST(n,t,v) static const t v
96 #endif
97
98 #if HAVE_SIMD_ALIGN_64
99 #define ALIGN_64 64
100 #define ALIGN_32 32
101 #elif HAVE_SIMD_ALIGN_32
102 #define ALIGN_64 32
103 #define ALIGN_32 32
104 #else
107 #endif
108
109 #define DECLARE_ALIGNED(n,t,v) DECLARE_ALIGNED_V(n,t,v)
110
111 // Macro needs to be double-wrapped in order to expand
112 // possible other macros being passed for n.
113 #define DECLARE_ALIGNED_V(n,t,v) DECLARE_ALIGNED_##n(t,v)
114
115 #define DECLARE_ALIGNED_4(t,v) DECLARE_ALIGNED_T( 4, t, v)
116 #define DECLARE_ALIGNED_8(t,v) DECLARE_ALIGNED_T( 8, t, v)
117 #define DECLARE_ALIGNED_16(t,v) DECLARE_ALIGNED_T( 16, t, v)
118 #define DECLARE_ALIGNED_32(t,v) DECLARE_ALIGNED_T(ALIGN_32, t, v)
119 #define DECLARE_ALIGNED_64(t,v) DECLARE_ALIGNED_T(ALIGN_64, t, v)
120
121 // Some broken preprocessors need a second expansion
122 // to be forced to tokenize __VA_ARGS__
124
125 #define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
126 uint8_t la_##v[sizeof(t s o) + (a)]; \
127 t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
128
129 #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
130 DECLARE_ALIGNED(a, t, la_##v) s o; \
131 t (*v) o = la_##v
132
133 #define LOCAL_ALIGNED(a, t, v, ...) LOCAL_ALIGNED_##a(t, v, __VA_ARGS__)
134
135 #if HAVE_LOCAL_ALIGNED
136 # define LOCAL_ALIGNED_4(t, v, ...) E1(LOCAL_ALIGNED_D(4, t, v, __VA_ARGS__,,))
137 #else
138 # define LOCAL_ALIGNED_4(t, v, ...) E1(LOCAL_ALIGNED_A(4, t, v, __VA_ARGS__,,))
139 #endif
140
141 #if HAVE_LOCAL_ALIGNED
142 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
143 #else
144 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_A(8, t, v, __VA_ARGS__,,))
145 #endif
146
147 #if HAVE_LOCAL_ALIGNED
148 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
149 #else
150 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_A(16, t, v, __VA_ARGS__,,))
151 #endif
152
153 #if HAVE_LOCAL_ALIGNED
154 # define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_D(32, t, v, __VA_ARGS__,,))
155 #else
156 # define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_A(32, t, v, __VA_ARGS__,,))
157 #endif
158
159 #endif /* AVUTIL_MEM_INTERNAL_H */