1 /* 2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved 3 * 4 * This source code is subject to the terms of the BSD 2 Clause License and 5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License 6 * was not distributed with this source code in the LICENSE file, you can 7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open 8 * Media Patent License 1.0 was not distributed with this source code in the 9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent. 10 */ 11 12 #ifndef AOM_AOM_PORTS_MEM_H_ 13 #define AOM_AOM_PORTS_MEM_H_ 14 15 #include "aom/aom_integer.h" 16 #include "config/aom_config.h" 17 18 #if (defined(__GNUC__) && __GNUC__) || defined(__SUNPRO_C) 19 #define DECLARE_ALIGNED(n, typ, val) typ val __attribute__((aligned(n))) 20 #elif defined(_MSC_VER) 21 #define DECLARE_ALIGNED(n, typ, val) __declspec(align(n)) typ val 22 #else 23 #warning No alignment directives known for this compiler. 24 #define DECLARE_ALIGNED(n, typ, val) typ val 25 #endif 26 27 /* Indicates that the usage of the specified variable has been audited to assure 28 * that it's safe to use uninitialized. Silences 'may be used uninitialized' 29 * warnings on gcc. 30 */ 31 #if defined(__GNUC__) && __GNUC__ 32 #define UNINITIALIZED_IS_SAFE(x) x = x 33 #else 34 #define UNINITIALIZED_IS_SAFE(x) x 35 #endif 36 37 #if HAVE_NEON && defined(_MSC_VER) 38 #define __builtin_prefetch(x) 39 #endif 40 41 /* Shift down with rounding for use when n >= 0. Usually value >= 0, but the 42 * macro can be used with a negative value if the direction of rounding is 43 * acceptable. 44 */ 45 #define ROUND_POWER_OF_TWO(value, n) (((value) + (((1 << (n)) >> 1))) >> (n)) 46 47 /* Shift down with rounding for signed integers, for use when n >= 0 */ 48 #define ROUND_POWER_OF_TWO_SIGNED(value, n) \ 49 (((value) < 0) ? -ROUND_POWER_OF_TWO(-(value), (n)) \ 50 : ROUND_POWER_OF_TWO((value), (n))) 51 52 /* Shift down with rounding for use when n >= 0 (64-bit value). Usually 53 * value >= 0, but the macro can be used with a negative value if the direction 54 * of rounding is acceptable. 55 */ 56 #define ROUND_POWER_OF_TWO_64(value, n) \ 57 (((value) + ((((int64_t)1 << (n)) >> 1))) >> (n)) 58 /* Shift down with rounding for signed integers, for use when n >= 0 (64-bit 59 * value) 60 */ 61 #define ROUND_POWER_OF_TWO_SIGNED_64(value, n) \ 62 (((value) < 0) ? -ROUND_POWER_OF_TWO_64(-(value), (n)) \ 63 : ROUND_POWER_OF_TWO_64((value), (n))) 64 65 /* shift right or left depending on sign of n */ 66 #define RIGHT_SIGNED_SHIFT(value, n) \ 67 ((n) < 0 ? ((value) << (-(n))) : ((value) >> (n))) 68 69 #define ALIGN_POWER_OF_TWO(value, n) \ 70 (((value) + ((1 << (n)) - 1)) & ~((1 << (n)) - 1)) 71 72 #define DIVIDE_AND_ROUND(x, y) (((x) + ((y) >> 1)) / (y)) 73 74 #define CONVERT_TO_SHORTPTR(x) ((uint16_t *)(((uintptr_t)(x)) << 1)) 75 #define CONVERT_TO_BYTEPTR(x) ((uint8_t *)(((uintptr_t)(x)) >> 1)) 76 77 /*!\brief force enum to be unsigned 1 byte*/ 78 #define UENUM1BYTE(enumvar) \ 79 ; \ 80 typedef uint8_t enumvar 81 82 /*!\brief force enum to be signed 1 byte*/ 83 #define SENUM1BYTE(enumvar) \ 84 ; \ 85 typedef int8_t enumvar 86 87 /*!\brief force enum to be unsigned 2 byte*/ 88 #define UENUM2BYTE(enumvar) \ 89 ; \ 90 typedef uint16_t enumvar 91 92 /*!\brief force enum to be signed 2 byte*/ 93 #define SENUM2BYTE(enumvar) \ 94 ; \ 95 typedef int16_t enumvar 96 97 /*!\brief force enum to be unsigned 4 byte*/ 98 #define UENUM4BYTE(enumvar) \ 99 ; \ 100 typedef uint32_t enumvar 101 102 /*!\brief force enum to be unsigned 4 byte*/ 103 #define SENUM4BYTE(enumvar) \ 104 ; \ 105 typedef int32_t enumvar 106 107 #endif // AOM_AOM_PORTS_MEM_H_ 108