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Add extra OPTIMIZATION-IF-FALSE comments where required to pcache.c.

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FossilOrigin-Name: 9d55b8f541de43deb82d460d32005fd62f5430b2
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dan
2016-05-12 17:06:04 +00:00
parent 91ef8ad42c
commit 82c0447701
3 changed files with 14 additions and 12 deletions
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9
src/pcache.c
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@@ -424,8 +424,11 @@ void SQLITE_NOINLINE sqlite3PcacheRelease(PgHdr *p){
if( (--p->nRef)==0 ){
if( p->flags&PGHDR_CLEAN ){
pcacheUnpin(p);
}else if( p->pDirtyPrev!=0 ){
/* Move the page to the head of the dirty list. */
}else if( p->pDirtyPrev!=0 ){ /*OPTIMIZATION-IF-FALSE*/
/* Move the page to the head of the dirty list. If p->pDirtyPrev==0,
** then page p is already at the head of the dirty list and the
** following call would be a no-op. Hence the OPTIMIZATION-IF-FALSE
** tag above. */
pcacheManageDirtyList(p, PCACHE_DIRTYLIST_FRONT);
}
}
@@ -460,7 +463,7 @@ void sqlite3PcacheDrop(PgHdr *p){
*/
void sqlite3PcacheMakeDirty(PgHdr *p){
assert( p->nRef>0 );
if( p->flags & (PGHDR_CLEAN|PGHDR_DONT_WRITE) ){
if( p->flags & (PGHDR_CLEAN|PGHDR_DONT_WRITE) ){ /*OPTIMIZATION-IF-FALSE*/
p->flags &= ~PGHDR_DONT_WRITE;
if( p->flags & PGHDR_CLEAN ){
p->flags ^= (PGHDR_DIRTY|PGHDR_CLEAN);