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Avoid unnecessary zeroing of fields in the MemPage object that are going

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to be reinitialized before use anyhow.  A smaller and faster binary results.

FossilOrigin-Name: 01ada3d1068476f90dcae02cb089001ea4bcc23d
This commit is contained in:
drh
2016-12-09 16:02:00 +00:00
parent e0568d6fb8
commit a2ee589c46
6 changed files with 42 additions and 36 deletions
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8
src/btree.c
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@@ -2282,7 +2282,7 @@ int sqlite3BtreeOpen(
goto btree_open_out;
}
rc = sqlite3PagerOpen(pVfs, &pBt->pPager, zFilename,
EXTRA_SIZE, flags, vfsFlags, pageReinit);
sizeof(MemPage), flags, vfsFlags, pageReinit);
if( rc==SQLITE_OK ){
sqlite3PagerSetMmapLimit(pBt->pPager, db->szMmap);
rc = sqlite3PagerReadFileheader(pBt->pPager,sizeof(zDbHeader),zDbHeader);
@@ -6259,7 +6259,6 @@ static void dropCell(MemPage *pPage, int idx, int sz, int *pRC){
int hdr; /* Beginning of the header. 0 most pages. 100 page 1 */
if( *pRC ) return;
assert( idx>=0 && idx<pPage->nCell );
assert( CORRUPT_DB || sz==cellSize(pPage, idx) );
assert( sqlite3PagerIswriteable(pPage->pDbPage) );
@@ -6343,7 +6342,10 @@ static void insertCell(
put4byte(pCell, iChild);
}
j = pPage->nOverflow++;
assert( j<(int)(sizeof(pPage->apOvfl)/sizeof(pPage->apOvfl[0])) );
/* Comparison against ArraySize-1 since we hold back one extra slot
** as a contingency. In other words, never need more than 3 overflow
** slots but 4 are allocated, just to be safe. */
assert( j < ArraySize(pPage->apOvfl)-1 );
pPage->apOvfl[j] = pCell;
pPage->aiOvfl[j] = (u16)i;