diff --git a/manifest b/manifest
index 035ac11919..1b57c1c173 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Fix\sa\sharmless\scompiler\swarning.
-D 2020-09-01T00:26:21.415
+C Improvements\sto\sthe\sIN-early-out\soptimization\sso\sthat\sit\sworks\smore\nefficiently\swhen\sthere\sare\stwo\sor\smore\sindexed\sIN\sclauses\son\sa\ssingle\stable.
+D 2020-09-01T01:52:03.629
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -607,9 +607,9 @@ F src/upsert.c 2920de71b20f04fe25eb00b655d086f0ba60ea133c59d7fa3325c49838818e78
 F src/utf.c ee39565f0843775cc2c81135751ddd93eceb91a673ea2c57f61c76f288b041a0
 F src/util.c c0c7977de7ef9b8cb10f6c85f2d0557889a658f817b0455909a49179ba4c8002
 F src/vacuum.c 492422c1463c076473bae1858799c7a0a5fe87a133d1223239447c422cd26286
-F src/vdbe.c c5da1456c9de0993055be9c10ebc5f5eb2be75d28cb01c8abc2f083923835a2d
+F src/vdbe.c 6430a540012b8b4c81076565804fcb979040e1b1a43ce76d2381863884155d84
 F src/vdbe.h 83603854bfa5851af601fc0947671eb260f4363e62e960e8a994fb9bbcd2aaa1
-F src/vdbeInt.h 762abffb7709f19c2cb74af1bba73a900f762e64f80d69c31c9ae89ed1066b60
+F src/vdbeInt.h 3ca5e9fd6e095a8b6cf6bc3587a46fc93499503b2fe48951e1034ba9e2ce2f6e
 F src/vdbeapi.c c5e7cb2ab89a24d7f723e87b508f21bfb1359a04db5277d8a99fd1e015c12eb9
 F src/vdbeaux.c b39d2e0e7126cd4629874dd7b67162b9f0d200b620d2b4c16d400949a2f1094b
 F src/vdbeblob.c 253ed82894924c362a7fa3079551d3554cd1cdace39aa833da77d3bc67e7c1b1
@@ -624,7 +624,7 @@ F src/wal.h c3aa7825bfa2fe0d85bef2db94655f99870a285778baa36307c0a16da32b226a
 F src/walker.c 3df26a33dc4f54e8771600fb7fdebe1ece0896c2ad68c30ab40b017aa4395049
 F src/where.c 23f47e845e304a41d0b221bf67bd170014ae08b673076813fcd945dda1a3d4af
 F src/whereInt.h eb8c2847fb464728533777efec1682b3c074224293b2da73513c61a609efbeab
-F src/wherecode.c 110fa357bf453e0d30bf5ebb2cc86ea34a3631c39b857f30c228fd325cb53ae7
+F src/wherecode.c 8b1176a3b7d4d61f78b0516bb7f6bb3803c658a6565663b8414c3b5d37a02eaa
 F src/whereexpr.c 264d58971eaf8256eb5b0917bcd7fc7a1f1109fdda183a8382308a1b18a2dce7
 F src/window.c edd6f5e25a1e8f2b6f5305b7f5f7da7bb35f07f0d432b255b1d4c2fcab4205aa
 F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
@@ -1710,7 +1710,7 @@ F test/walthread.test 14b20fcfa6ae152f5d8e12f5dc8a8a724b7ef189f5d8ef1e2ceab79f2a
 F test/walvfs.test a2913001a83b19c1d20220e556cee14d87d47ecb6949b5e0a2e9e2590abecf1e
 F test/wapp.tcl b440cd8cf57953d3a49e7ee81e6a18f18efdaf113b69f7d8482b0710a64566ec
 F test/wapptest.tcl 899594e25684861d5b0c0880fb012364def50ef8097041b8ddf74be5ba7fa270 x
-F test/where.test f5e62453537e5b335b69f3b09f8a02ce3328289fad5d866e25371284b837d78d
+F test/where.test e713c0c64e3e6b062235e39a2f7e5508c517df16b63d69fd786e26bc7330b1c6
 F test/where2.test 478d2170637b9211f593120648858593bf2445a1
 F test/where3.test 2341a294e17193a6b1699ea7f192124a5286ca6acfcc3f4b06d16c931fbcda2c
 F test/where4.test 4a371bfcc607f41d233701bdec33ac2972908ba8
@@ -1879,7 +1879,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P dca5b91926431768babac28a6faf7674a5014db95caba727995b470e92b3182a
-R a054e4b5c94ece883c5cccfc8d30d6f5
+P 3ca0b7d54d73d07cd6b32e650a809174bb1cd66ce5ecdb36f65b70899ea05824
+R 16504c659945ee05da548d177d28a416
 U drh
-Z d20f9b26275b88faf3b4eb1260a25f4c
+Z d1eb95f49e8d2ff17d6f9cd7b555126f
diff --git a/manifest.uuid b/manifest.uuid
index 3241b00ddb..880e8c42ce 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-3ca0b7d54d73d07cd6b32e650a809174bb1cd66ce5ecdb36f65b70899ea05824
\ No newline at end of file
+35505c68c1945c35babd2496e02bc4907a15c8e7b8d77f05f230bd0e9d4891d7
\ No newline at end of file
diff --git a/src/vdbe.c b/src/vdbe.c
index bc5addabab..a579b4ea11 100644
--- a/src/vdbe.c
+++ b/src/vdbe.c
@@ -4383,22 +4383,31 @@ seek_not_found:
   break;
 }
 
-/* Opcode: SeekHit P1 P2 * * *
-** Synopsis: seekHit=P2
+/* Opcode: SeekHit P1 P2 P3 * *
+** Synopsis: set P2<=seekHit<=P3
 **
-** Set the seekHit flag on cursor P1 to the value in P2.
-** The seekHit flag is used by the IfNoHope opcode.
+** Increase or decrease the seekHit value for cursor P1, if necessary,
+** so that it is no less than P2 and no greater than P3.
 **
-** P1 must be a valid b-tree cursor.  P2 must be a boolean value,
-** either 0 or 1.
+** The seekHit integer represents the maximum of terms in an index for which
+** there is known to be at least one match.  If the seekHit value is smaller
+** than the total number of equality terms in an index lookup, then the
+** OP_IfNoHope opcode might run to see if the IN loop can be abandoned
+** early, thus saving work.  This is part of the IN-early-out optimization.
+**
+** P1 must be a valid b-tree cursor.
 */
 case OP_SeekHit: {
   VdbeCursor *pC;
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
   pC = p->apCsr[pOp->p1];
   assert( pC!=0 );
-  assert( pOp->p2==0 || pOp->p2==1 );
-  pC->seekHit = pOp->p2 & 1;
+  assert( pOp->p3>=pOp->p2 );
+  if( pC->seekHit<pOp->p2 ){
+    pC->seekHit = pOp->p2;
+  }else if( pC->seekHit>pOp->p3 ){
+    pC->seekHit = pOp->p3;
+  }
   break;
 }
 
@@ -4456,16 +4465,20 @@ case OP_IfNotOpen: {        /* jump */
 ** Synopsis: key=r[P3@P4]
 **
 ** Register P3 is the first of P4 registers that form an unpacked
-** record.
+** record.  Cursor P1 is an index btree.  P2 is a jump destination.
+** In other words, the operands to this opcode are the same as the
+** operands to OP_NotFound and OP_IdxGT.
 **
-** Cursor P1 is on an index btree.  If the seekHit flag is set on P1, then
-** this opcode is a no-op.  But if the seekHit flag of P1 is clear, then
-** check to see if there is any entry in P1 that matches the
-** prefix identified by P3 and P4.  If no entry matches the prefix,
-** jump to P2.  Otherwise fall through.
+** This opcode is an optimization attempt only.  If this opcode always
+** falls through, the correct answer is still obtained, but extra works
+** is performed.
 **
-** This opcode behaves like OP_NotFound if the seekHit
-** flag is clear and it behaves like OP_Noop if the seekHit flag is set.
+** A value of N in the seekHit flag of cursor P1 means that there exists
+** a key P3:N that will match some record in the index.  We want to know
+** if it is possible for a record P3:P4 to match some record in the
+** index.  If it is not possible, we can skips some work.  So if seekHit
+** is less than P4, attempt to find out if a match is possible by running
+** OP_NotFound.
 **
 ** This opcode is used in IN clause processing for a multi-column key.
 ** If an IN clause is attached to an element of the key other than the
@@ -4507,7 +4520,7 @@ case OP_IfNoHope: {     /* jump, in3 */
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
   pC = p->apCsr[pOp->p1];
   assert( pC!=0 );
-  if( pC->seekHit ) break;
+  if( pC->seekHit>=pOp->p4.i ) break;
   /* Fall through into OP_NotFound */
   /* no break */ deliberate_fall_through
 }
@@ -4589,6 +4602,7 @@ case OP_Found: {        /* jump, in3 */
   }else{
     VdbeBranchTaken(takeJump||alreadyExists==0,2);
     if( takeJump || !alreadyExists ) goto jump_to_p2;
+    if( pOp->opcode==OP_IfNoHope ) pC->seekHit = pOp->p4.i;
   }
   break;
 }
diff --git a/src/vdbeInt.h b/src/vdbeInt.h
index 901569742f..7d22cb8093 100644
--- a/src/vdbeInt.h
+++ b/src/vdbeInt.h
@@ -86,7 +86,7 @@ struct VdbeCursor {
   Bool isEphemeral:1;     /* True for an ephemeral table */
   Bool useRandomRowid:1;  /* Generate new record numbers semi-randomly */
   Bool isOrdered:1;       /* True if the table is not BTREE_UNORDERED */
-  Bool seekHit:1;         /* See the OP_SeekHit and OP_IfNoHope opcodes */
+  u16 seekHit;            /* See the OP_SeekHit and OP_IfNoHope opcodes */
   Btree *pBtx;            /* Separate file holding temporary table */
   i64 seqCount;           /* Sequence counter */
   u32 *aAltMap;           /* Mapping from table to index column numbers */
diff --git a/src/wherecode.c b/src/wherecode.c
index 145b6fa5f5..591f267e82 100644
--- a/src/wherecode.c
+++ b/src/wherecode.c
@@ -570,6 +570,9 @@ static int codeEqualityTerm(
     if( pLevel->u.in.nIn==0 ){
       pLevel->addrNxt = sqlite3VdbeMakeLabel(pParse);
     }
+    if( iEq>0 ){
+      pLoop->wsFlags |= WHERE_IN_EARLYOUT;
+    }
 
     i = pLevel->u.in.nIn;
     pLevel->u.in.nIn += nEq;
@@ -596,7 +599,6 @@ static int codeEqualityTerm(
             if( iEq>0 ){
               pIn->iBase = iReg - i;
               pIn->nPrefix = i;
-              pLoop->wsFlags |= WHERE_IN_EARLYOUT;
             }else{
               pIn->nPrefix = 0;
             }
@@ -606,6 +608,9 @@ static int codeEqualityTerm(
           pIn++;
         }
       }
+      if( iEq>0 ){
+        sqlite3VdbeAddOp3(v, OP_SeekHit, pLevel->iIdxCur, 0, iEq);
+      }
     }else{
       pLevel->u.in.nIn = 0;
     }
@@ -1789,9 +1794,6 @@ Bitmask sqlite3WhereCodeOneLoopStart(
       ** above has already left the cursor sitting on the correct row,
       ** so no further seeking is needed */
     }else{
-      if( pLoop->wsFlags & WHERE_IN_EARLYOUT ){
-        sqlite3VdbeAddOp1(v, OP_SeekHit, iIdxCur);
-      }
       if( regBignull ){
         sqlite3VdbeAddOp2(v, OP_Integer, 1, regBignull);
         VdbeComment((v, "NULL-scan pass ctr"));
@@ -1902,7 +1904,7 @@ Bitmask sqlite3WhereCodeOneLoopStart(
     }
 
     if( pLoop->wsFlags & WHERE_IN_EARLYOUT ){
-      sqlite3VdbeAddOp2(v, OP_SeekHit, iIdxCur, 1);
+      sqlite3VdbeAddOp3(v, OP_SeekHit, iIdxCur, nEq, nEq);
     }
 
     /* Seek the table cursor, if required */
diff --git a/test/where.test b/test/where.test
index 9b072da677..fa3bcd836c 100644
--- a/test/where.test
+++ b/test/where.test
@@ -490,12 +490,12 @@ ifcapable subquery {
     count {
       SELECT * FROM t1 WHERE x IN (1,7) AND y IN (9,10) ORDER BY 1;
     }
-  } {2 1 9 4}
+  } {2 1 9 5}
   do_test where-5.15 {
     count {
       SELECT * FROM t1 WHERE x IN (1,7) AND y IN (9,16) ORDER BY 1;
     }
-  } {2 1 9 3 1 16 8}
+  } {2 1 9 3 1 16 9}
   do_test where-5.100 {
     db eval {
       SELECT w, x, y FROM t1 WHERE x IN (1,5) AND y IN (9,8,3025,1000,3969)