More optimizations to sqlite3BtreeMovetoUnpacked(). But there are failures

in TH3.  Committing this intermediate state to facilitate bisecting.

FossilOrigin-Name: f80497be446f84d2000e454e32d717887a7d0cee

manifest

@@ -1,5 +1,5 @@
-C More\simprovements\sto\ssqlite3BtreeMovetoUnpacked()\sperformance.
+C More\soptimizations\sto\ssqlite3BtreeMovetoUnpacked().\s\sBut\sthere\sare\sfailures\nin\sTH3.\s\sCommitting\sthis\sintermediate\sstate\sto\sfacilitate\sbisecting.
-D 2013-11-25T14:10:15.692
+D 2013-11-25T15:01:38.218
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in e1a9b4258bbde53f5636f4e238c65b7e11459e2b
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -166,7 +166,7 @@ F src/auth.c 523da7fb4979469955d822ff9298352d6b31de34
 F src/backup.c 1809a7caa2504233bdddd12f5018422421789537
 F src/bitvec.c 19a4ba637bd85f8f63fc8c9bae5ade9fb05ec1cb
 F src/btmutex.c 976f45a12e37293e32cae0281b15a21d48a8aaa7
-F src/btree.c c300cb68948a03f0049addddd9e36f28551e78ae
+F src/btree.c 7459c164e26b1dca39d439186a4cf8328e0ffb1f
 F src/btree.h a61ddebc78c66795a2b93181321a116746302cc9
 F src/btreeInt.h f038e818bfadf75afbd09819ed93c26a333d39e0
 F src/build.c 07054d45319953e54a89d726e589a423e9c1c590
@@ -1142,7 +1142,7 @@ F tool/vdbe-compress.tcl f12c884766bd14277f4fcedcae07078011717381
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh d1a6de74685f360ab718efda6265994b99bbea01
 F tool/win/sqlite.vsix 030f3eeaf2cb811a3692ab9c14d021a75ce41fff
-P d0fb7acea7cbfe6f2d84782a28bb51675a06576f
+P 88680698231b7141401f7166e3aff8dbc6008030
-R 29c1330ebdfb45d969bc6dbf6661ccf0
+R a02e2482a947ddc5fc2d75dda36e99fc
 U drh
-Z d111eff6e7e1e09087be24d32976d9d6
+Z 1dd2b4d4fc066dfd776d99dd8b11e059

manifest.uuid

@@ -1 +1 @@
-88680698231b7141401f7166e3aff8dbc6008030
+f80497be446f84d2000e454e32d717887a7d0cee

src/btree.c

@@ -4662,7 +4662,7 @@ int sqlite3BtreeMovetoUnpacked(
     assert( pPage->intKey==(pIdxKey==0) );
     lwr = 0;
     upr = pPage->nCell-1;
-    idx = biasRight ? upr : (upr+lwr)/2;
+    idx = biasRight ? upr : upr/2;
     pCur->aiIdx[pCur->iPage] = (u16)idx;
     pCur->info.nSize = 0;
     if( pPage->intKey ){
@@ -4674,28 +4674,26 @@ int sqlite3BtreeMovetoUnpacked(
           pCell += getVarint32(pCell, dummy);
         }
         getVarint(pCell, (u64*)&nCellKey);
-        if( nCellKey==intKey ){
+        if( nCellKey<intKey ){
+          lwr = idx+1;
+          if( lwr>upr ){ c = -1; break; }
+        }else if( nCellKey>intKey ){
+          upr = idx-1;
+          if( lwr>upr ){ c = +1; break; }
+        }else{
+          assert( nCellKey==intKey );
           pCur->validNKey = 1;
           pCur->info.nKey = nCellKey;
           pCur->aiIdx[pCur->iPage] = (u16)idx;
           if( !pPage->leaf ){
             lwr = idx;
+            c = 0;
             break;
           }else{
             *pRes = 0;
             rc = SQLITE_OK;
             goto moveto_finish;
           }
-        }else if( nCellKey<intKey ){
-          lwr = idx+1;
-        }else{
-          assert( nCellKey>intKey );
-          upr = idx-1;
-        }
-        if( lwr>upr ){
-          c = nCellKey<intKey ? -1 : +1;
-          pCur->aiIdx[pCur->iPage] = (u16)idx;
-          break;
         }
         idx = (lwr+upr)/2;
       }
@@ -4752,19 +4750,18 @@ int sqlite3BtreeMovetoUnpacked(
           c = sqlite3VdbeRecordCompare(nCell, pCellKey, pIdxKey);
           sqlite3_free(pCellKey);
         }
-        if( c==0 ){
+        if( c<0 ){
+          lwr = idx+1;
+        }else if( c>0 ){
+          upr = idx-1;
+        }else{
+          assert( c==0 );
           *pRes = 0;
           rc = SQLITE_OK;
           pCur->aiIdx[pCur->iPage] = (u16)idx;
           goto moveto_finish;
         }
-        if( c<0 ){
-          lwr = idx+1;
-        }else{
-          upr = idx-1;
-        }
         if( lwr>upr ){
-          pCur->aiIdx[pCur->iPage] = (u16)idx;
           break;
         }
         idx = (lwr+upr)/2;
@@ -4774,6 +4771,7 @@ int sqlite3BtreeMovetoUnpacked(
     assert( pPage->isInit );
     if( pPage->leaf ){
       assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell );
+      pCur->aiIdx[pCur->iPage] = (u16)idx;
       *pRes = c;
       rc = SQLITE_OK;
       goto moveto_finish;