2 * Copyright (c) 2002 Fabrice Bellard
4 * This file is part of FFmpeg.
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.
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.
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
21 #ifndef AVUTIL_MEM_INTERNAL_H
22 #define AVUTIL_MEM_INTERNAL_H
32 #if !FF_API_DECLARE_ALIGNED
34 * @def DECLARE_ALIGNED(n,t,v)
35 * Declare a variable that is aligned in memory.
38 * DECLARE_ALIGNED(16, uint16_t, aligned_int) = 42;
39 * DECLARE_ALIGNED(32, uint8_t, aligned_array)[128];
41 * // The default-alignment equivalent would be
42 * uint16_t aligned_int = 42;
43 * uint8_t aligned_array[128];
46 * @param n Minimum alignment in bytes
47 * @param t Type of the variable (or array element)
48 * @param v Name of the variable
52 * @def DECLARE_ASM_ALIGNED(n,t,v)
53 * Declare an aligned variable appropriate for use in inline assembly code.
56 * DECLARE_ASM_ALIGNED(16, uint64_t, pw_08) = UINT64_C(0x0008000800080008);
59 * @param n Minimum alignment in bytes
60 * @param t Type of the variable (or array element)
61 * @param v Name of the variable
65 * @def DECLARE_ASM_CONST(n,t,v)
66 * Declare a static constant aligned variable appropriate for use in inline
70 * DECLARE_ASM_CONST(16, uint64_t, pw_08) = UINT64_C(0x0008000800080008);
73 * @param n Minimum alignment in bytes
74 * @param t Type of the variable (or array element)
75 * @param v Name of the variable
78 #if defined(__INTEL_COMPILER) && __INTEL_COMPILER < 1110 || defined(__SUNPRO_C)
79 #define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
80 #define DECLARE_ASM_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
81 #define DECLARE_ASM_CONST(n,t,v) const t __attribute__ ((aligned (n))) v
82 #elif defined(__DJGPP__)
83 #define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (FFMIN(n, 16)))) v
84 #define DECLARE_ASM_ALIGNED(n,t,v) t av_used __attribute__ ((aligned (FFMIN(n, 16)))) v
85 #define DECLARE_ASM_CONST(n,t,v) static const t av_used __attribute__ ((aligned (FFMIN(n, 16)))) v
86 #elif defined(__GNUC__) || defined(__clang__)
87 #define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
88 #define DECLARE_ASM_ALIGNED(n,t,v) t av_used __attribute__ ((aligned (n))) v
89 #define DECLARE_ASM_CONST(n,t,v) static const t av_used __attribute__ ((aligned (n))) v
90 #elif defined(_MSC_VER)
91 #define DECLARE_ALIGNED(n,t,v) __declspec(align(n)) t v
92 #define DECLARE_ASM_ALIGNED(n,t,v) __declspec(align(n)) t v
93 #define DECLARE_ASM_CONST(n,t,v) __declspec(align(n)) static const t v
95 #define DECLARE_ALIGNED(n,t,v) t v
96 #define DECLARE_ASM_ALIGNED(n,t,v) t v
97 #define DECLARE_ASM_CONST(n,t,v) static const t v
101 // Some broken preprocessors need a second expansion
102 // to be forced to tokenize __VA_ARGS__
105 #define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
106 uint8_t la_##v[sizeof(t s o) + (a)]; \
107 t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
109 #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
110 DECLARE_ALIGNED(a, t, la_##v) s o; \
113 #define LOCAL_ALIGNED(a, t, v, ...) LOCAL_ALIGNED_##a(t, v, __VA_ARGS__)
115 #if HAVE_LOCAL_ALIGNED
116 # define LOCAL_ALIGNED_4(t, v, ...) E1(LOCAL_ALIGNED_D(4, t, v, __VA_ARGS__,,))
118 # define LOCAL_ALIGNED_4(t, v, ...) E1(LOCAL_ALIGNED_A(4, t, v, __VA_ARGS__,,))
121 #if HAVE_LOCAL_ALIGNED
122 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
124 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_A(8, t, v, __VA_ARGS__,,))
127 #if HAVE_LOCAL_ALIGNED
128 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
130 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_A(16, t, v, __VA_ARGS__,,))
133 #if HAVE_LOCAL_ALIGNED
134 # define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_D(32, t, v, __VA_ARGS__,,))
136 # define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_A(32, t, v, __VA_ARGS__,,))
139 static inline int ff_fast_malloc(void *ptr, unsigned int *size, size_t min_size, int zero_realloc)
143 memcpy(&val, ptr, sizeof(val));
144 if (min_size <= *size) {
145 av_assert0(val || !min_size);
148 min_size = FFMAX(min_size + min_size / 16 + 32, min_size);
150 val = zero_realloc ? av_mallocz(min_size) : av_malloc(min_size);
151 memcpy(ptr, &val, sizeof(val));
157 #endif /* AVUTIL_MEM_INTERNAL_H */