FFmpeg: Alignment Macros

FFmpeg

Alignment Macros

Helper macros for declaring aligned variables. More...

Macros

#define DECLARE_ALIGNED(n, t, v) t __attribute__ ((aligned (n))) v

#define DECLARE_ASM_ALIGNED(n, t, v) t av_used __attribute__ ((aligned (n))) v

#define DECLARE_ASM_CONST(n, t, v) static const t av_used __attribute__ ((aligned (n))) v

Helper macros for declaring aligned variables.

#define DECLARE_ALIGNED ( n,

) t __attribute__ ((aligned (n))) v

Declare a variable that is aligned in memory.

DECLARE_ALIGNED(16, uint16_t, aligned_int) = 42;

DECLARE_ALIGNED(32, uint8_t, aligned_array)[128];

// The default-alignment equivalent would be

uint16_t aligned_int = 42;

uint8_t aligned_array[128];

Parameters: n Minimum alignment in bytes

t Type of the variable (or array element)

v Name of the variable

Definition at line 116 of file mem.h.

#define DECLARE_ASM_ALIGNED ( n,

) t av_used __attribute__ ((aligned (n))) v

Declare an aligned variable appropriate for use in inline assembly code.

DECLARE_ASM_ALIGNED(16, uint64_t, pw_08) = UINT64_C(0x0008000800080008);

Parameters: n Minimum alignment in bytes

t Type of the variable (or array element)

v Name of the variable

Definition at line 117 of file mem.h.

#define DECLARE_ASM_CONST ( n,

) static const t av_used __attribute__ ((aligned (n))) v

Declare a static constant aligned variable appropriate for use in inline assembly code.

DECLARE_ASM_CONST(16, uint64_t, pw_08) = UINT64_C(0x0008000800080008);

Parameters: n Minimum alignment in bytes

t Type of the variable (or array element)

v Name of the variable

Definition at line 118 of file mem.h.

#define DECLARE_ASM_CONST(n, t, v)

Definition: mem.h:118

#define DECLARE_ASM_ALIGNED(n, t, v)

Definition: mem.h:117

#define DECLARE_ALIGNED(n, t, v)

Definition: mem.h:116

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