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Allocate Parse objects off of the stack where appropriate for a substantial

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performance increase and a size reduction.

FossilOrigin-Name: ea8affa9e453b201b479162f621b591e7a65a489
This commit is contained in:
drh
2016-10-03 01:21:51 +00:00
parent 1a7df58c1a
commit cb43a937e5
6 changed files with 53 additions and 71 deletions
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12
src/wherecode.c
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@ -1987,7 +1987,7 @@ Bitmask sqlite3WhereCodeOneLoopStart(
** the implied "t1.a=123" constraint.
*/
for(pTerm=pWC->a, j=pWC->nTerm; j>0; j--, pTerm++){
Expr *pE, *pEAlt;
Expr *pE, sEAlt;
WhereTerm *pAlt;
if( pTerm->wtFlags & (TERM_VIRTUAL|TERM_CODED) ) continue;
if( (pTerm->eOperator & (WO_EQ|WO_IS))==0 ) continue;
@ -2005,13 +2005,9 @@ Bitmask sqlite3WhereCodeOneLoopStart(
testcase( pAlt->eOperator & WO_IS );
testcase( pAlt->eOperator & WO_IN );
VdbeModuleComment((v, "begin transitive constraint"));
pEAlt = sqlite3StackAllocRaw(db, sizeof(*pEAlt));
if( pEAlt ){
*pEAlt = *pAlt->pExpr;
pEAlt->pLeft = pE->pLeft;
sqlite3ExprIfFalse(pParse, pEAlt, addrCont, SQLITE_JUMPIFNULL);
sqlite3StackFree(db, pEAlt);
}
sEAlt = *pAlt->pExpr;
sEAlt.pLeft = pE->pLeft;
sqlite3ExprIfFalse(pParse, &sEAlt, addrCont, SQLITE_JUMPIFNULL);
}
/* For a LEFT OUTER JOIN, generate code that will record the fact that