mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-22 15:23:11 +00:00
d1e37eb0cd
It's currently actually not used in MSVC builds, since
6e49b86996.
Older versions of MSVC (or, in particular, older versions of UCRT)
don't have stdalign.h; it's available since WinSDK 10.0.20348.0;
such a new enough version has been installed by default only since
MSVC 2022 17.4 and newer.
With this change, ffmpeg can still be built with MSVC 2019 16.8
(v19.28).
Signed-off-by: Martin Storsjö <martin@martin.st>
135 lines
4.2 KiB
C
135 lines
4.2 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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#ifndef _MSC_VER
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#include <stdalign.h>
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#endif
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#include "attributes.h"
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#include "macros.h"
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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(__DJGPP__)
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#define DECLARE_ALIGNED_T(n,t,v) alignas(FFMIN(n, 16)) t v
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#define DECLARE_ASM_ALIGNED(n,t,v) alignas(FFMIN(n, 16)) t av_used v
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#define DECLARE_ASM_CONST(n,t,v) alignas(FFMIN(n, 16)) static const t av_used v
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#elif defined(_MSC_VER)
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#define DECLARE_ALIGNED_T(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_T(n,t,v) alignas(n) t v
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#define DECLARE_ASM_ALIGNED(n,t,v) alignas(n) t av_used v
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#define DECLARE_ASM_CONST(n,t,v) alignas(n) static const t av_used v
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#endif
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#if HAVE_SIMD_ALIGN_64
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#define ALIGN_64 64
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#define ALIGN_32 32
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#elif HAVE_SIMD_ALIGN_32
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#define ALIGN_64 32
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#define ALIGN_32 32
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#else
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#define ALIGN_64 16
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#define ALIGN_32 16
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#endif
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#define DECLARE_ALIGNED(n,t,v) DECLARE_ALIGNED_V(n,t,v)
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// Macro needs to be double-wrapped in order to expand
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// possible other macros being passed for n.
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#define DECLARE_ALIGNED_V(n,t,v) DECLARE_ALIGNED_##n(t,v)
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#define DECLARE_ALIGNED_4(t,v) DECLARE_ALIGNED_T( 4, t, v)
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#define DECLARE_ALIGNED_8(t,v) DECLARE_ALIGNED_T( 8, t, v)
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#define DECLARE_ALIGNED_16(t,v) DECLARE_ALIGNED_T( 16, t, v)
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#define DECLARE_ALIGNED_32(t,v) DECLARE_ALIGNED_T(ALIGN_32, t, v)
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#define DECLARE_ALIGNED_64(t,v) DECLARE_ALIGNED_T(ALIGN_64, t, v)
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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_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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#define LOCAL_ALIGNED_4(t, v, ...) E1(LOCAL_ALIGNED_D(4, t, v, __VA_ARGS__,,))
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#define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
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#define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
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#define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_D(32, t, v, __VA_ARGS__,,))
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#endif /* AVUTIL_MEM_INTERNAL_H */
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