mirror of
https://github.com/FFmpeg/FFmpeg.git
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140 lines
4.7 KiB
C
140 lines
4.7 KiB
C
/*
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* Copyright (c) 2002 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_MEM_INTERNAL_H
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#define AVUTIL_MEM_INTERNAL_H
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#include "config.h"
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#include <stdint.h>
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#include "avassert.h"
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#include "mem.h"
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#include "version.h"
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#if !FF_API_DECLARE_ALIGNED
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/**
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* @def DECLARE_ALIGNED(n,t,v)
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* Declare a variable that is aligned in memory.
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*
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* @code{.c}
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* DECLARE_ALIGNED(16, uint16_t, aligned_int) = 42;
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* DECLARE_ALIGNED(32, uint8_t, aligned_array)[128];
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*
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* // The default-alignment equivalent would be
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* uint16_t aligned_int = 42;
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* uint8_t aligned_array[128];
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* @endcode
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*
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* @param n Minimum alignment in bytes
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* @param t Type of the variable (or array element)
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* @param v Name of the variable
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*/
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/**
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* @def DECLARE_ASM_ALIGNED(n,t,v)
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* Declare an aligned variable appropriate for use in inline assembly code.
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*
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* @code{.c}
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* DECLARE_ASM_ALIGNED(16, uint64_t, pw_08) = UINT64_C(0x0008000800080008);
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* @endcode
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*
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* @param n Minimum alignment in bytes
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* @param t Type of the variable (or array element)
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* @param v Name of the variable
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*/
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/**
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* @def DECLARE_ASM_CONST(n,t,v)
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* Declare a static constant aligned variable appropriate for use in inline
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* assembly code.
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*
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* @code{.c}
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* DECLARE_ASM_CONST(16, uint64_t, pw_08) = UINT64_C(0x0008000800080008);
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* @endcode
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*
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* @param n Minimum alignment in bytes
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* @param t Type of the variable (or array element)
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* @param v Name of the variable
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*/
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#if defined(__INTEL_COMPILER) && __INTEL_COMPILER < 1110 || defined(__SUNPRO_C)
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#define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
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#define DECLARE_ASM_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
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#define DECLARE_ASM_CONST(n,t,v) const t __attribute__ ((aligned (n))) v
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#elif defined(__DJGPP__)
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#define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (FFMIN(n, 16)))) v
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#define DECLARE_ASM_ALIGNED(n,t,v) t av_used __attribute__ ((aligned (FFMIN(n, 16)))) v
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#define DECLARE_ASM_CONST(n,t,v) static const t av_used __attribute__ ((aligned (FFMIN(n, 16)))) v
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#elif defined(__GNUC__) || defined(__clang__)
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#define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
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#define DECLARE_ASM_ALIGNED(n,t,v) t av_used __attribute__ ((aligned (n))) v
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#define DECLARE_ASM_CONST(n,t,v) static const t av_used __attribute__ ((aligned (n))) v
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#elif defined(_MSC_VER)
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#define DECLARE_ALIGNED(n,t,v) __declspec(align(n)) t v
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#define DECLARE_ASM_ALIGNED(n,t,v) __declspec(align(n)) t v
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#define DECLARE_ASM_CONST(n,t,v) __declspec(align(n)) static const t v
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#else
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#define DECLARE_ALIGNED(n,t,v) t v
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#define DECLARE_ASM_ALIGNED(n,t,v) t v
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#define DECLARE_ASM_CONST(n,t,v) static const t v
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#endif
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#endif
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// Some broken preprocessors need a second expansion
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// to be forced to tokenize __VA_ARGS__
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#define E1(x) x
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#define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
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uint8_t la_##v[sizeof(t s o) + (a)]; \
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t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
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#define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
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DECLARE_ALIGNED(a, t, la_##v) s o; \
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t (*v) o = la_##v
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#define LOCAL_ALIGNED(a, t, v, ...) LOCAL_ALIGNED_##a(t, v, __VA_ARGS__)
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#if HAVE_LOCAL_ALIGNED
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# define LOCAL_ALIGNED_4(t, v, ...) E1(LOCAL_ALIGNED_D(4, t, v, __VA_ARGS__,,))
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#else
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# define LOCAL_ALIGNED_4(t, v, ...) E1(LOCAL_ALIGNED_A(4, t, v, __VA_ARGS__,,))
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#endif
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#if HAVE_LOCAL_ALIGNED
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# define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
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#else
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# define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_A(8, t, v, __VA_ARGS__,,))
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#endif
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#if HAVE_LOCAL_ALIGNED
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# define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
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#else
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# define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_A(16, t, v, __VA_ARGS__,,))
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#endif
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#if HAVE_LOCAL_ALIGNED
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# define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_D(32, t, v, __VA_ARGS__,,))
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#else
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# define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_A(32, t, v, __VA_ARGS__,,))
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#endif
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#endif /* AVUTIL_MEM_INTERNAL_H */
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