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Avoid initializing the column-cache section of the Parse object, since entries

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in the cache will be initialized as they are used, and avoiding the initial
memset() saves many CPU cycles.

FossilOrigin-Name: 63cf7eafae5c3c1379edf416c5157010c7c120b5
This commit is contained in:
drh
2016-09-30 22:24:29 +00:00
parent 94881d732b
commit cd9af608e1
5 changed files with 38 additions and 23 deletions
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4
src/prepare.c
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@@ -524,11 +524,13 @@ static int sqlite3Prepare(
int i; /* Loop counter */
/* Allocate the parsing context */
pParse = sqlite3StackAllocZero(db, sizeof(*pParse));
pParse = sqlite3StackAllocRaw(db, sizeof(*pParse));
if( pParse==0 ){
rc = SQLITE_NOMEM_BKPT;
goto end_prepare;
}
memset(pParse, 0, PARSE_HDR_SZ);
memset(PARSE_TAIL(pParse), 0, PARSE_TAIL_SZ);
pParse->pReprepare = pReprepare;
assert( ppStmt && *ppStmt==0 );
/* assert( !db->mallocFailed ); // not true with SQLITE_USE_ALLOCA */