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Btree optimization: New field BtCursor.pPage that points to the current page,

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saving a single pointer dereference on each access.

FossilOrigin-Name: 373b71d19cad785922d5a80828f2fee0cbe7dff6594743e625bbdfa31b1ca131
This commit is contained in:
drh
2017-08-15 03:46:47 +00:00
parent f38dd3b68f
commit 352a35abf5
4 changed files with 103 additions and 84 deletions
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src/btreeInt.h
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@@ -522,7 +522,8 @@ struct BtCursor {
u16 ix; /* Current index for apPage[iPage] */
u16 aiIdx[BTCURSOR_MAX_DEPTH-1]; /* Current index in apPage[i] */
struct KeyInfo *pKeyInfo; /* Arg passed to comparison function */
MemPage *apPage[BTCURSOR_MAX_DEPTH]; /* Pages from root to current page */
MemPage *pPage; /* Current page */
MemPage *apPage[BTCURSOR_MAX_DEPTH-1]; /* Stack of parents of current page */
};
/*