Performance optimizations in the VDBE and especially to the OP_Next and

related opcodes.

FossilOrigin-Name: d78c5d89de4b840351b026c9db1952fc24e689d0

manifest

@@ -1,5 +1,5 @@
-C Performance\simprovement\sto\sSQL\sfunction\scalls\sin\sthe\sVDBE.
-D 2013-08-19T23:18:12.597
+C Performance\soptimizations\sin\sthe\sVDBE\sand\sespecially\sto\sthe\sOP_Next\sand\nrelated\sopcodes.
+D 2013-08-20T00:42:11.120
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 5e41da95d92656a5004b03d3576e8b226858a28e
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -163,7 +163,7 @@ F src/auth.c 523da7fb4979469955d822ff9298352d6b31de34
 F src/backup.c 43b348822db3e4cef48b2ae5a445fbeb6c73a165
 F src/bitvec.c 19a4ba637bd85f8f63fc8c9bae5ade9fb05ec1cb
 F src/btmutex.c 976f45a12e37293e32cae0281b15a21d48a8aaa7
-F src/btree.c d8cb52cddfe575d91b90d056d91607259f78706b
+F src/btree.c adea13e65d6c7b969bcd74cea6ae79b2d3c393fa
 F src/btree.h bfe0e8c5759b4ec77b0d18390064a6ef3cdffaaf
 F src/btreeInt.h 51cf220a9b9223354770883e93a859dc377aa27f
 F src/build.c f99a715ff9290996b579d5e1ec8e94239dc9ae5e
@@ -277,10 +277,10 @@ F src/update.c 7f3fe64d8f3b44c44a1eac293f0f85f87c355b7a
 F src/utf.c 8d819e2e5104a430fc2005f018db14347c95a38f
 F src/util.c f566b5138099a2df8533b190d0dcc74b7dfbe0c9
 F src/vacuum.c d9c5759f4c5a438bb43c2086f72c5d2edabc36c8
-F src/vdbe.c 54d28e7fbea2215998f8e12fcb0ddb15fadc5b14
+F src/vdbe.c 938feb53407dee2234849aad0f103ae9b941595e
 F src/vdbe.h 4f554b5627f26710c4c36d919110a3fc611ca5c4
-F src/vdbeInt.h 6931139cefc2f01f8612b771a31d96d06b1a6860
-F src/vdbeapi.c a183f0daa22374427bd4cf3f18a6261aac141f5a
+F src/vdbeInt.h cbe71b8b36d8b3bba5709cc3f436c7e3b47b7b08
+F src/vdbeapi.c 96b24b946cf21894f63d9393e821baa2f0a80979
 F src/vdbeaux.c a6ea36a9dc714e1128a0173249a0532ddcab0489
 F src/vdbeblob.c 5dc79627775bd9a9b494dd956e26297946417d69
 F src/vdbemem.c 833005f1cbbf447289f1973dba2a0c2228c7b8ab
@@ -1106,7 +1106,7 @@ F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
 F tool/wherecosttest.c f407dc4c79786982a475261866a161cd007947ae
 F tool/win/sqlite.vsix 97894c2790eda7b5bce3cc79cb2a8ec2fde9b3ac
-P 6f99b54aedeb91e46d52f65504d02a9cc61c0062
-R a4ebd23f8bd1f91badaa0be999a387b9
+P d2efea1682a7e708000c1f5d36370aaf1199b3be
+R 08cd0ad5f78761d7e8cb97606228a179
 U drh
-Z 07c571cc9e32147d1ee20914dbc33fe8
+Z 1caed0652391fde507351b876419455b

manifest.uuid

@@ -1 +1 @@
-d2efea1682a7e708000c1f5d36370aaf1199b3be
+d78c5d89de4b840351b026c9db1952fc24e689d0

src/btree.c

@@ -4804,6 +4804,7 @@ int sqlite3BtreeNext(BtCursor *pCur, int *pRes){
   if( pCur->eState!=CURSOR_VALID ){
     rc = restoreCursorPosition(pCur);
     if( rc!=SQLITE_OK ){
+      *pRes = 0;
       return rc;
     }
     if( CURSOR_INVALID==pCur->eState ){
@@ -4838,7 +4839,10 @@ int sqlite3BtreeNext(BtCursor *pCur, int *pRes){
   if( idx>=pPage->nCell ){
     if( !pPage->leaf ){
       rc = moveToChild(pCur, get4byte(&pPage->aData[pPage->hdrOffset+8]));
-      if( rc ) return rc;
+      if( rc ){
+        *pRes = 0;
+        return rc;
+      }
       rc = moveToLeftmost(pCur);
       *pRes = 0;
       return rc;
@@ -4886,7 +4890,10 @@ int sqlite3BtreePrevious(BtCursor *pCur, int *pRes){
   if( pCur->eState!=CURSOR_VALID ){
     if( ALWAYS(pCur->eState>=CURSOR_REQUIRESEEK) ){
       rc = btreeRestoreCursorPosition(pCur);
-      if( rc!=SQLITE_OK ) return rc;
+      if( rc!=SQLITE_OK ){
+        *pRes = 0;
+        return rc;
+      }
     }
     if( CURSOR_INVALID==pCur->eState ){
       *pRes = 1;
@@ -4910,6 +4917,7 @@ int sqlite3BtreePrevious(BtCursor *pCur, int *pRes){
     int idx = pCur->aiIdx[pCur->iPage];
     rc = moveToChild(pCur, get4byte(findCell(pPage, idx)));
     if( rc ){
+      *pRes = 0;
       return rc;
     }
     rc = moveToRightmost(pCur);

src/vdbe.c

@@ -588,7 +588,7 @@ int sqlite3VdbeExec(
 #ifndef SQLITE_OMIT_PROGRESS_CALLBACK
   if( db->xProgress ){
     assert( 0 < db->nProgressOps );
-    nProgressLimit = (unsigned)p->aCounter[SQLITE_STMTSTATUS_VM_STEP-1];
+    nProgressLimit = (unsigned)p->aCounter[SQLITE_STMTSTATUS_VM_STEP];
     if( nProgressLimit==0 ){
       nProgressLimit = db->nProgressOps;
     }else{
@@ -1848,12 +1848,12 @@ case OP_Ge: {             /* same as TK_GE, jump, in1, in3 */
       ** then the result is always NULL.
       ** The jump is taken if the SQLITE_JUMPIFNULL bit is set.
       */
-      if( pOp->p5 & SQLITE_STOREP2 ){
+      if( pOp->p5 & SQLITE_JUMPIFNULL ){
+        pc = pOp->p2-1;
+      }else if( pOp->p5 & SQLITE_STOREP2 ){
         pOut = &aMem[pOp->p2];
         MemSetTypeFlag(pOut, MEM_Null);
         REGISTER_TRACE(pOp->p2, pOut);
-      }else if( pOp->p5 & SQLITE_JUMPIFNULL ){
-        pc = pOp->p2-1;
       }
       break;
     }
@@ -4438,7 +4438,7 @@ case OP_Sort: {        /* jump */
   sqlite3_sort_count++;
   sqlite3_search_count--;
 #endif
-  p->aCounter[SQLITE_STMTSTATUS_SORT-1]++;
+  p->aCounter[SQLITE_STMTSTATUS_SORT]++;
   /* Fall through into OP_Rewind */
 }
 /* Opcode: Rewind P1 P2 * * *
@@ -4517,7 +4517,7 @@ case OP_Next: {        /* jump */
   int res;
 
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
-  assert( pOp->p5<=ArraySize(p->aCounter) );
+  assert( pOp->p5<ArraySize(p->aCounter) );
   pC = p->apCsr[pOp->p1];
   if( pC==0 ){
     break;  /* See ticket #2273 */
@@ -4527,7 +4527,7 @@ case OP_Next: {        /* jump */
     assert( pOp->opcode==OP_SorterNext );
     rc = sqlite3VdbeSorterNext(db, pC, &res);
   }else{
-    res = 1;
+    /* res = 1; // Always initialized by the xAdvance() call */
     assert( pC->deferredMoveto==0 );
     assert( pC->pCursor );
     assert( pOp->opcode!=OP_Next || pOp->p4.xAdvance==sqlite3BtreeNext );
@@ -4538,7 +4538,7 @@ case OP_Next: {        /* jump */
   pC->cacheStatus = CACHE_STALE;
   if( res==0 ){
     pc = pOp->p2 - 1;
-    if( pOp->p5 ) p->aCounter[pOp->p5-1]++;
+    p->aCounter[pOp->p5]++;
 #ifdef SQLITE_TEST
     sqlite3_search_count++;
 #endif
@@ -6241,7 +6241,7 @@ vdbe_error_halt:
 vdbe_return:
   db->lastRowid = lastRowid;
   testcase( nVmStep>0 );
-  p->aCounter[SQLITE_STMTSTATUS_VM_STEP-1] += (int)nVmStep;
+  p->aCounter[SQLITE_STMTSTATUS_VM_STEP] += (int)nVmStep;
   sqlite3VdbeLeave(p);
   return rc;
 

src/vdbeInt.h

@@ -346,7 +346,7 @@ struct Vdbe {
   yDbMask btreeMask;      /* Bitmask of db->aDb[] entries referenced */
   yDbMask lockMask;       /* Subset of btreeMask that requires a lock */
   int iStatement;         /* Statement number (or 0 if has not opened stmt) */
-  int aCounter[4];        /* Counters used by sqlite3_stmt_status() */
+  u32 aCounter[5];        /* Counters used by sqlite3_stmt_status() */
 #ifndef SQLITE_OMIT_TRACE
   i64 startTime;          /* Time when query started - used for profiling */
 #endif

src/vdbeapi.c

@@ -1298,7 +1298,7 @@ sqlite3_stmt *sqlite3_next_stmt(sqlite3 *pDb, sqlite3_stmt *pStmt){
 */
 int sqlite3_stmt_status(sqlite3_stmt *pStmt, int op, int resetFlag){
   Vdbe *pVdbe = (Vdbe*)pStmt;
-  int v = pVdbe->aCounter[op-1];
-  if( resetFlag ) pVdbe->aCounter[op-1] = 0;
-  return v;
+  u32 v = pVdbe->aCounter[op];
+  if( resetFlag ) pVdbe->aCounter[op] = 0;
+  return (int)v;
 }