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 28 #include "avassert.h" 29 #include "mem.h" 30 #include "version.h" 31 32 #if !FF_API_DECLARE_ALIGNED 33 /** 34 * @def DECLARE_ALIGNED(n,t,v) 35 * Declare a variable that is aligned in memory. 36 * 37 * @code{.c} 38 * DECLARE_ALIGNED(16, uint16_t, aligned_int) = 42; 39 * DECLARE_ALIGNED(32, uint8_t, aligned_array)[128]; 40 * 41 * // The default-alignment equivalent would be 42 * uint16_t aligned_int = 42; 43 * uint8_t aligned_array[128]; 44 * @endcode 45 * 46 * @param n Minimum alignment in bytes 47 * @param t Type of the variable (or array element) 48 * @param v Name of the variable 49 */ 50 51 /** 52 * @def DECLARE_ASM_ALIGNED(n,t,v) 53 * Declare an aligned variable appropriate for use in inline assembly code. 54 * 55 * @code{.c} 56 * DECLARE_ASM_ALIGNED(16, uint64_t, pw_08) = UINT64_C(0x0008000800080008); 57 * @endcode 58 * 59 * @param n Minimum alignment in bytes 60 * @param t Type of the variable (or array element) 61 * @param v Name of the variable 62 */ 63 64 /** 65 * @def DECLARE_ASM_CONST(n,t,v) 66 * Declare a static constant aligned variable appropriate for use in inline 67 * assembly code. 68 * 69 * @code{.c} 70 * DECLARE_ASM_CONST(16, uint64_t, pw_08) = UINT64_C(0x0008000800080008); 71 * @endcode 72 * 73 * @param n Minimum alignment in bytes 74 * @param t Type of the variable (or array element) 75 * @param v Name of the variable 76 */ 77 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 94 #else 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 98 #endif 99 #endif 100 101 // Some broken preprocessors need a second expansion 102 // to be forced to tokenize __VA_ARGS__ 103 #define E1(x) x 104 105 #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) 108 109 #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \ 110 DECLARE_ALIGNED(a, t, la_##v) s o; \ 111 t (*v) o = la_##v 112 113 #define LOCAL_ALIGNED(a, t, v, ...) LOCAL_ALIGNED_##a(t, v, __VA_ARGS__) 114 115 #if HAVE_LOCAL_ALIGNED 116 # define LOCAL_ALIGNED_4(t, v, ...) E1(LOCAL_ALIGNED_D(4, t, v, __VA_ARGS__,,)) 117 #else 118 # define LOCAL_ALIGNED_4(t, v, ...) E1(LOCAL_ALIGNED_A(4, t, v, __VA_ARGS__,,)) 119 #endif 120 121 #if HAVE_LOCAL_ALIGNED 122 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,)) 123 #else 124 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_A(8, t, v, __VA_ARGS__,,)) 125 #endif 126 127 #if HAVE_LOCAL_ALIGNED 128 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,)) 129 #else 130 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_A(16, t, v, __VA_ARGS__,,)) 131 #endif 132 133 #if HAVE_LOCAL_ALIGNED 134 # define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_D(32, t, v, __VA_ARGS__,,)) 135 #else 136 # define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_A(32, t, v, __VA_ARGS__,,)) 137 #endif 138 139 #endif /* AVUTIL_MEM_INTERNAL_H */ 140