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Use memmove() rather than a home-made copy loop in dropCell() of btree.c,

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for a size reduction and performance improvement.

FossilOrigin-Name: 78e1706804e88a0dd5dc40bee838a3a504cfa53b
This commit is contained in:
drh
2013-12-09 01:58:11 +00:00
parent 29f2bad6f0
commit 9bb7c4ff4f
3 changed files with 8 additions and 14 deletions
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8
src/btree.c
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@@ -5671,7 +5671,6 @@ static void dropCell(MemPage *pPage, int idx, int sz, int *pRC){
u32 pc; /* Offset to cell content of cell being deleted */
u8 *data; /* pPage->aData */
u8 *ptr; /* Used to move bytes around within data[] */
u8 *endPtr; /* End of loop */
int rc; /* The return code */
int hdr; /* Beginning of the header. 0 most pages. 100 page 1 */
@@ -5696,13 +5695,8 @@ static void dropCell(MemPage *pPage, int idx, int sz, int *pRC){
*pRC = rc;
return;
}
endPtr = &pPage->aCellIdx[2*pPage->nCell - 2];
assert( (SQLITE_PTR_TO_INT(ptr)&1)==0 ); /* ptr is always 2-byte aligned */
while( ptr<endPtr ){
*(u16*)ptr = *(u16*)&ptr[2];
ptr += 2;
}
pPage->nCell--;
memmove(ptr, ptr+2, 2*(pPage->nCell - idx));
put2byte(&data[hdr+3], pPage->nCell);
pPage->nFree += 2;
}