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vp8: pack struct VP8ThreadData more efficiently

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Reordering the members in this struct reduces the holes required
to maintain alignment.  With this order, the only remaining, and
unavoidable, hole is 3 bytes following left_nnz.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2012-08-01 14:01:08 +01:00
parent ec7c501ed5
commit cf5781fad0
1 changed files with 17 additions and 17 deletions
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34
libavcodec/vp8.h
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@ -94,21 +94,8 @@ typedef struct {
} VP8Macroblock;
typedef struct {
#if HAVE_THREADS
pthread_mutex_t lock;
pthread_cond_t cond;
#endif
int thread_nr;
int thread_mb_pos; // (mb_y << 16) | (mb_x & 0xFFFF)
int wait_mb_pos; // What the current thread is waiting on.
uint8_t *edge_emu_buffer;
/**
* For coeff decode, we need to know whether the above block had non-zero
* coefficients. This means for each macroblock, we need data for 4 luma
* blocks, 2 u blocks, 2 v blocks, and the luma dc block, for a total of 9
* per macroblock. We keep the last row in top_nnz.
*/
DECLARE_ALIGNED(8, uint8_t, left_nnz)[9];
DECLARE_ALIGNED(16, DCTELEM, block)[6][4][16];
DECLARE_ALIGNED(16, DCTELEM, block_dc)[16];
/**
* This is the index plus one of the last non-zero coeff
* for each of the blocks in the current macroblock.
@ -117,8 +104,21 @@ typedef struct {
* 2+-> full transform
*/
DECLARE_ALIGNED(16, uint8_t, non_zero_count_cache)[6][4];
DECLARE_ALIGNED(16, DCTELEM, block)[6][4][16];
DECLARE_ALIGNED(16, DCTELEM, block_dc)[16];
/**
* For coeff decode, we need to know whether the above block had non-zero
* coefficients. This means for each macroblock, we need data for 4 luma
* blocks, 2 u blocks, 2 v blocks, and the luma dc block, for a total of 9
* per macroblock. We keep the last row in top_nnz.
*/
DECLARE_ALIGNED(8, uint8_t, left_nnz)[9];
int thread_nr;
#if HAVE_THREADS
pthread_mutex_t lock;
pthread_cond_t cond;
#endif
int thread_mb_pos; // (mb_y << 16) | (mb_x & 0xFFFF)
int wait_mb_pos; // What the current thread is waiting on.
uint8_t *edge_emu_buffer;
VP8FilterStrength *filter_strength;
} VP8ThreadData;