зеркало из https://github.com/mozilla/gecko-dev.git
68 строки
2.5 KiB
C
68 строки
2.5 KiB
C
/*
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* Copyright (c) 2016, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#ifndef AOM_PORTS_MEM_H_
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#define AOM_PORTS_MEM_H_
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#include "aom_config.h"
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#include "aom/aom_integer.h"
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#if (defined(__GNUC__) && __GNUC__) || defined(__SUNPRO_C)
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#define DECLARE_ALIGNED(n, typ, val) typ val __attribute__((aligned(n)))
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#elif defined(_MSC_VER)
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#define DECLARE_ALIGNED(n, typ, val) __declspec(align(n)) typ val
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#else
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#warning No alignment directives known for this compiler.
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#define DECLARE_ALIGNED(n, typ, val) typ val
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#endif
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/* Indicates that the usage of the specified variable has been audited to assure
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* that it's safe to use uninitialized. Silences 'may be used uninitialized'
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* warnings on gcc.
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*/
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#if defined(__GNUC__) && __GNUC__
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#define UNINITIALIZED_IS_SAFE(x) x = x
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#else
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#define UNINITIALIZED_IS_SAFE(x) x
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#endif
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#if HAVE_NEON && defined(_MSC_VER)
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#define __builtin_prefetch(x)
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#endif
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/* Shift down with rounding for use when n >= 0, value >= 0 */
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#define ROUND_POWER_OF_TWO(value, n) (((value) + (((1 << (n)) >> 1))) >> (n))
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/* Shift down with rounding for signed integers, for use when n >= 0 */
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#define ROUND_POWER_OF_TWO_SIGNED(value, n) \
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(((value) < 0) ? -ROUND_POWER_OF_TWO(-(value), (n)) \
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: ROUND_POWER_OF_TWO((value), (n)))
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/* Shift down with rounding for use when n >= 0, value >= 0 for (64 bit) */
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#define ROUND_POWER_OF_TWO_64(value, n) \
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(((value) + ((((int64_t)1 << (n)) >> 1))) >> (n))
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/* Shift down with rounding for signed integers, for use when n >= 0 (64 bit) */
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#define ROUND_POWER_OF_TWO_SIGNED_64(value, n) \
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(((value) < 0) ? -ROUND_POWER_OF_TWO_64(-(value), (n)) \
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: ROUND_POWER_OF_TWO_64((value), (n)))
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/* shift right or left depending on sign of n */
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#define RIGHT_SIGNED_SHIFT(value, n) \
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((n) < 0 ? ((value) << (-(n))) : ((value) >> (n)))
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#define ALIGN_POWER_OF_TWO(value, n) \
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(((value) + ((1 << (n)) - 1)) & ~((1 << (n)) - 1))
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#define CONVERT_TO_SHORTPTR(x) ((uint16_t *)(((uintptr_t)(x)) << 1))
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#define CONVERT_TO_BYTEPTR(x) ((uint8_t *)(((uintptr_t)(x)) >> 1))
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#endif // AOM_PORTS_MEM_H_
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