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 #ifndef _MSC_VER
28 #include <stdalign.h>
29 #endif
30
33
34 /**
35 * @def DECLARE_ALIGNED(n,t,v)
36 * Declare a variable that is aligned in memory.
37 *
38 * @code{.c}
39 * DECLARE_ALIGNED(16, uint16_t, aligned_int) = 42;
40 * DECLARE_ALIGNED(32, uint8_t, aligned_array)[128];
41 *
42 * // The default-alignment equivalent would be
43 * uint16_t aligned_int = 42;
44 * uint8_t aligned_array[128];
45 * @endcode
46 *
47 * @param n Minimum alignment in bytes
48 * @param t Type of the variable (or array element)
49 * @param v Name of the variable
50 */
51
52 /**
53 * @def DECLARE_ASM_ALIGNED(n,t,v)
54 * Declare an aligned variable appropriate for use in inline assembly code.
55 *
56 * @code{.c}
57 * DECLARE_ASM_ALIGNED(16, uint64_t, pw_08) = UINT64_C(0x0008000800080008);
58 * @endcode
59 *
60 * @param n Minimum alignment in bytes
61 * @param t Type of the variable (or array element)
62 * @param v Name of the variable
63 */
64
65 /**
66 * @def DECLARE_ASM_CONST(n,t,v)
67 * Declare a static constant aligned variable appropriate for use in inline
68 * assembly code.
69 *
70 * @code{.c}
71 * DECLARE_ASM_CONST(16, uint64_t, pw_08) = UINT64_C(0x0008000800080008);
72 * @endcode
73 *
74 * @param n Minimum alignment in bytes
75 * @param t Type of the variable (or array element)
76 * @param v Name of the variable
77 */
78
79 #if defined(__DJGPP__)
80 #define DECLARE_ALIGNED_T(n,t,v) alignas(FFMIN(n, 16)) t v
81 #define DECLARE_ASM_ALIGNED(n,t,v) alignas(FFMIN(n, 16)) t av_used v
82 #define DECLARE_ASM_CONST(n,t,v) alignas(FFMIN(n, 16)) static const t av_used v
83 #elif defined(_MSC_VER)
84 #define DECLARE_ALIGNED_T(n,t,v) __declspec(align(n)) t v
85 #define DECLARE_ASM_ALIGNED(n,t,v) __declspec(align(n)) t av_used v
86 #define DECLARE_ASM_CONST(n,t,v) __declspec(align(n)) static const t av_used v
87 #else
88 #define DECLARE_ALIGNED_T(n,t,v) alignas(n) t v
89 #define DECLARE_ASM_ALIGNED(n,t,v) alignas(n) t av_used v
90 #define DECLARE_ASM_CONST(n,t,v) alignas(n) static const t av_used v
91 #endif
92
93 #if HAVE_SIMD_ALIGN_64
94 #define ALIGN_64 64
95 #define ALIGN_32 32
96 #elif HAVE_SIMD_ALIGN_32
97 #define ALIGN_64 32
98 #define ALIGN_32 32
99 #else
102 #endif
103
104 #define DECLARE_ALIGNED(n,t,v) DECLARE_ALIGNED_V(n,t,v)
105
106 // Macro needs to be double-wrapped in order to expand
107 // possible other macros being passed for n.
108 #define DECLARE_ALIGNED_V(n,t,v) DECLARE_ALIGNED_##n(t,v)
109
110 #define DECLARE_ALIGNED_4(t,v) DECLARE_ALIGNED_T( 4, t, v)
111 #define DECLARE_ALIGNED_8(t,v) DECLARE_ALIGNED_T( 8, t, v)
112 #define DECLARE_ALIGNED_16(t,v) DECLARE_ALIGNED_T( 16, t, v)
113 #define DECLARE_ALIGNED_32(t,v) DECLARE_ALIGNED_T(ALIGN_32, t, v)
114 #define DECLARE_ALIGNED_64(t,v) DECLARE_ALIGNED_T(ALIGN_64, t, v)
115
116 // Some broken preprocessors need a second expansion
117 // to be forced to tokenize __VA_ARGS__
119
120 #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
121 DECLARE_ALIGNED(a, t, la_##v) s o; \
122 t (*v) o = la_##v
123
124 #define LOCAL_ALIGNED(a, t, v, ...) LOCAL_ALIGNED_##a(t, v, __VA_ARGS__)
125
126 #define LOCAL_ALIGNED_4(t, v, ...) E1(LOCAL_ALIGNED_D(4, t, v, __VA_ARGS__,,))
127
128 #define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
129
130 #define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
131
132 #define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_D(32, t, v, __VA_ARGS__,,))
133
134 #define LOCAL_ALIGNED_64(t, v, ...) E1(LOCAL_ALIGNED_D(64, t, v, __VA_ARGS__,,))
135
136 #endif /* AVUTIL_MEM_INTERNAL_H */