Performance improvements and size reductions on the OP_Seek* family of

VDBE opcodes.

FossilOrigin-Name: ed820f45cf4354b1e1db64049c47a07221a7ff6d

manifest

@@ -1,8 +1,8 @@
 -----BEGIN PGP SIGNED MESSAGE-----
 Hash: SHA1
 
-C Simplify\sthe\sOPFLG\sprocessing\slogic\sin\sthe\sVDBE\sfor\sa\sspeed\sboost\sin\sthe\nVDBE\sprocessing\sloop\sand\sa\sreduction\sin\scode\ssize.
-D 2009-11-13T19:43:44
+C Performance\simprovements\sand\ssize\sreductions\son\sthe\sOP_Seek*\sfamily\sof\nVDBE\sopcodes.
+D 2009-11-13T20:52:44
 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
 F Makefile.in 53f3dfa49f28ab5b80cb083fb7c9051e596bcfa1
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -210,7 +210,7 @@ F src/update.c 8efeb09822886e33c265dd96d29a3d865ea6dcf2
 F src/utf.c dad16adcc0c35ef2437dca125a4b07419d361052
 F src/util.c ad4f03079ba0fe83590d1cc9197e8e4844e38592
 F src/vacuum.c 03309a08d549f9389cc3a3589afd4fadbdaf0679
-F src/vdbe.c bc7fe6c752a86adb63ddfdefe41c2912f0dbb207
+F src/vdbe.c 74158ea3fd68231720ba75ebec5072eda1ad8cf9
 F src/vdbe.h 65cd747e36ad444cb1a17e529030942c45a61fe3
 F src/vdbeInt.h 59c65e7b810836b9e946acee45c7b3c02b967d1b
 F src/vdbeapi.c 17680ab7a75ec938c5ba039a6c87489d01faf2cb
@@ -771,14 +771,14 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
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+R 2242fd95cd691be062201d4a6409f215
 U drh
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manifest.uuid

@@ -1 +1 @@
-3352b3eba545c3128efb7665ec91d4df3b16011d
+ed820f45cf4354b1e1db64049c47a07221a7ff6d

src/vdbe.c

@@ -3179,6 +3179,9 @@ case OP_SeekGt: {       /* jump, in3 */
   pC = p->apCsr[pOp->p1];
   assert( pC!=0 );
   assert( pC->pseudoTableReg==0 );
+  assert( OP_SeekLe == OP_SeekLt+1 );
+  assert( OP_SeekGe == OP_SeekLt+2 );
+  assert( OP_SeekGt == OP_SeekLt+3 );
   if( pC->pCursor!=0 ){
     oc = pOp->opcode;
     pC->nullRow = 0;
@@ -3208,12 +3211,12 @@ case OP_SeekGt: {       /* jump, in3 */
           ** integer. */
           res = 1;
           if( pIn3->r<0 ){
-            if( oc==OP_SeekGt || oc==OP_SeekGe ){
+            if( oc>=OP_SeekGe ){  assert( oc==OP_SeekGe || oc==OP_SeekGt );
               rc = sqlite3BtreeFirst(pC->pCursor, &res);
               if( rc!=SQLITE_OK ) goto abort_due_to_error;
             }
           }else{
-            if( oc==OP_SeekLt || oc==OP_SeekLe ){
+            if( oc<=OP_SeekLe ){  assert( oc==OP_SeekLt || oc==OP_SeekLe );
               rc = sqlite3BtreeLast(pC->pCursor, &res);
               if( rc!=SQLITE_OK ) goto abort_due_to_error;
             }
@@ -3245,11 +3248,20 @@ case OP_SeekGt: {       /* jump, in3 */
       assert( nField>0 );
       r.pKeyInfo = pC->pKeyInfo;
       r.nField = (u16)nField;
-      if( oc==OP_SeekGt || oc==OP_SeekLe ){
-        r.flags = UNPACKED_INCRKEY;
-      }else{
-        r.flags = 0;
-      }
+
+      /* The next line of code computes as follows, only faster:
+      **   if( oc==OP_SeekGt || oc==OP_SeekLe ){
+      **     r.flags = UNPACKED_INCRKEY;
+      **   }else{
+      **     r.flags = 0;
+      **   }
+      */
+      r.flags = UNPACKED_INCRKEY * (1 & (oc - OP_SeekLt));
+      assert( oc!=OP_SeekGt || r.flags==UNPACKED_INCRKEY );
+      assert( oc!=OP_SeekLe || r.flags==UNPACKED_INCRKEY );
+      assert( oc!=OP_SeekGe || r.flags==0 );
+      assert( oc!=OP_SeekLt || r.flags==0 );
+
       r.aMem = &p->aMem[pOp->p3];
       rc = sqlite3BtreeMovetoUnpacked(pC->pCursor, &r, 0, 0, &res);
       if( rc!=SQLITE_OK ){
@@ -3262,7 +3274,7 @@ case OP_SeekGt: {       /* jump, in3 */
 #ifdef SQLITE_TEST
     sqlite3_search_count++;
 #endif
-    if( oc==OP_SeekGe || oc==OP_SeekGt ){
+    if( oc>=OP_SeekGe ){  assert( oc==OP_SeekGe || oc==OP_SeekGt );
       if( res<0 || (res==0 && oc==OP_SeekGt) ){
         rc = sqlite3BtreeNext(pC->pCursor, &res);
         if( rc!=SQLITE_OK ) goto abort_due_to_error;