SQLite

Check-in [1c0d82e078]
Login

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Remove unused fields from the BtCursor object.
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA3-256: 1c0d82e0786ed22d07d774b8b166340fad97bcaab6016e395c469bcfcb7c77a3
User & Date: drh 2017-04-01 11:40:05.090
Context
2017-04-01
11:59
Faster implementation for sqlite3VdbeIntValue() and sqlite3VdbeRealValue(). (check-in: 8698df60c2 user: drh tags: trunk)
11:40
Remove unused fields from the BtCursor object. (check-in: 1c0d82e078 user: drh tags: trunk)
00:20
Save a 78 bytes of code space and a million CPU cycles in speedtest1 by storing the cell index for the leaf page in the BtCursor object in its own field (BtCursor.ix), rather than as an entry in the BtCursor.aiIdx array. (check-in: 2452f0617d user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/btreeInt.h.
︙︙
514
515
516
517
518
519
520
521
522
523

524
525
526
527
528
529
530
531

  u8 hints;                 /* As configured by CursorSetHints() */
  /* All fields above are zeroed when the cursor is allocated.  See
  ** sqlite3BtreeCursorZero().  Fields that follow must be manually
  ** initialized. */
  i8 iPage;                 /* Index of current page in apPage */
  u8 curIntKey;             /* Value of apPage[0]->intKey */
  u16 ix;                   /* Current index for apPage[iPage] */
  struct KeyInfo *pKeyInfo; /* Argument passed to comparison function */
  void *padding1;           /* Make object size a multiple of 16 */
  u16 aiIdx[BTCURSOR_MAX_DEPTH];        /* Current index in apPage[i] */

  MemPage *apPage[BTCURSOR_MAX_DEPTH];  /* Pages from root to current page */
};

/*
** Legal values for BtCursor.curFlags
*/
#define BTCF_WriteFlag    0x01   /* True if a write cursor */
#define BTCF_ValidNKey    0x02   /* True if info.nKey is valid */








<
<
|
>
|








514
515
516
517
518
519
520


521
522
523
524
525
526
527
528
529
530

  u8 hints;                 /* As configured by CursorSetHints() */
  /* All fields above are zeroed when the cursor is allocated.  See
  ** sqlite3BtreeCursorZero().  Fields that follow must be manually
  ** initialized. */
  i8 iPage;                 /* Index of current page in apPage */
  u8 curIntKey;             /* Value of apPage[0]->intKey */
  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 */
};

/*
** Legal values for BtCursor.curFlags
*/
#define BTCF_WriteFlag    0x01   /* True if a write cursor */
#define BTCF_ValidNKey    0x02   /* True if info.nKey is valid */
︙︙