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Another performance tweak: Split the sqlite3BtreeCursorHasMoved() routine

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into two with the second routine named sqlite3BtreeCursorRestore().  The first
now only reports whether or not the cursor has moved and the second tries to
restore the cursor.  This allows the sqlite3VdbeCursorMoveto() routine to be
refactored to avoid stack pointer movements, for a noticable performance gain.

FossilOrigin-Name: ce123b5c592556a8cd38b01fcc91ba76231d3098
This commit is contained in:
drh
2014-08-22 23:33:03 +00:00
parent 637f3d83b9
commit 6848dad894
5 changed files with 88 additions and 53 deletions
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3
src/btree.h
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@@ -169,7 +169,8 @@ int sqlite3BtreeMovetoUnpacked(
int bias,
int *pRes
);
int sqlite3BtreeCursorHasMoved(BtCursor*, int*);
int sqlite3BtreeCursorHasMoved(BtCursor*);
int sqlite3BtreeCursorRestore(BtCursor*, int*);
int sqlite3BtreeDelete(BtCursor*);
int sqlite3BtreeInsert(BtCursor*, const void *pKey, i64 nKey,
const void *pData, int nData,