From cb89f4aba8e226adca32c5dad02a21220b80f177 Mon Sep 17 00:00:00 2001
From: drh <drh@noemail.net>
Date: Sat, 21 May 2016 11:23:26 +0000
Subject: [PATCH] Small size reduction and performance increase in the
 sqlite3BtreeInsert() logic.

FossilOrigin-Name: 656aa1ecf5129ae43c56a990e95038b5d8cbdcee
---
 manifest      | 12 ++++++------
 manifest.uuid |  2 +-
 src/btree.c   | 15 ++++++++++-----
 3 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/manifest b/manifest
index 03a75c80e4..836b8184c2 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Add\sthe\sshell-script\sused\sfor\sroutine\sperformance\stesting.
-D 2016-05-21T00:45:54.756
+C Small\ssize\sreduction\sand\sperformance\sincrease\sin\sthe\ssqlite3BtreeInsert()\nlogic.
+D 2016-05-21T11:23:26.914
 F Makefile.in f59e0763ff448719fc1bd25513882b0567286317
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 306d73e854b1a92ea06e5d1e637faa5c44de53c7
@@ -322,7 +322,7 @@ F src/auth.c b56c78ebe40a2110fd361379f7e8162d23f92240
 F src/backup.c 6df65fdd569c901a418887a1a76f82ec35044556
 F src/bitvec.c 3ee4c8b2c94ed3a7377256e18199e6ff5cf33f63
 F src/btmutex.c bc87dd3b062cc26edfe79918de2200ccb8d41e73
-F src/btree.c e53a01547d61a3d567daf7a7acc30122fe071aef
+F src/btree.c ab4ab00fa42b9f31a3c4f4232ab7dffe15a37728
 F src/btree.h a5008b9afe56e8e54ade6c436a910f112defcca9
 F src/btreeInt.h c18b7d2a3494695133e4e60ee36061d37f45d9a5
 F src/build.c 785fa789319d93c6ae20efbd01d4da9ce8f8a793
@@ -1492,7 +1492,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 96cf821b6a69e2e8df33271b7bb674bd12a1ef7b
-R ca27df5abd7cea75d52374965a3f09f5
+P 8e366f18f5bbd594390e7b091083e99639de324e
+R 59f3ac52df516414b0292061ce466d2b
 U drh
-Z 7380639ab417b2bbe053c05d7bd1cc2b
+Z 1ed41a6ca1c9810f6f5090ac3b0958c0
diff --git a/manifest.uuid b/manifest.uuid
index 4fc75f4fe0..6b45ee4bc0 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-8e366f18f5bbd594390e7b091083e99639de324e
\ No newline at end of file
+656aa1ecf5129ae43c56a990e95038b5d8cbdcee
\ No newline at end of file
diff --git a/src/btree.c b/src/btree.c
index 7e6b050f83..033d9c24c3 100644
--- a/src/btree.c
+++ b/src/btree.c
@@ -6310,6 +6310,8 @@ static void dropCell(MemPage *pPage, int idx, int sz, int *pRC){
 ** in pTemp or the original pCell) and also record its index. 
 ** Allocating a new entry in pPage->aCell[] implies that 
 ** pPage->nOverflow is incremented.
+**
+** *pRC must be SQLITE_OK when this routine is called.
 */
 static void insertCell(
   MemPage *pPage,   /* Page into which we are copying */
@@ -6325,8 +6327,7 @@ static void insertCell(
   u8 *data;         /* The content of the whole page */
   u8 *pIns;         /* The point in pPage->aCellIdx[] where no cell inserted */
 
-  if( *pRC ) return;
-
+  assert( *pRC==SQLITE_OK );
   assert( i>=0 && i<=pPage->nCell+pPage->nOverflow );
   assert( MX_CELL(pPage->pBt)<=10921 );
   assert( pPage->nCell<=MX_CELL(pPage->pBt) || CORRUPT_DB );
@@ -6832,8 +6833,10 @@ static int balance_quick(MemPage *pParent, MemPage *pPage, u8 *pSpace){
     while( ((*(pOut++) = *(pCell++))&0x80) && pCell<pStop );
 
     /* Insert the new divider cell into pParent. */
-    insertCell(pParent, pParent->nCell, pSpace, (int)(pOut-pSpace),
-               0, pPage->pgno, &rc);
+    if( rc==SQLITE_OK ){
+      insertCell(pParent, pParent->nCell, pSpace, (int)(pOut-pSpace),
+                   0, pPage->pgno, &rc);
+    }
 
     /* Set the right-child pointer of pParent to point to the new page. */
     put4byte(&pParent->aData[pParent->hdrOffset+8], pgnoNew);
@@ -8215,7 +8218,9 @@ int sqlite3BtreeDelete(BtCursor *pCur, u8 flags){
     pTmp = pBt->pTmpSpace;
     assert( pTmp!=0 );
     rc = sqlite3PagerWrite(pLeaf->pDbPage);
-    insertCell(pPage, iCellIdx, pCell-4, nCell+4, pTmp, n, &rc);
+    if( rc==SQLITE_OK ){
+      insertCell(pPage, iCellIdx, pCell-4, nCell+4, pTmp, n, &rc);
+    }
     dropCell(pLeaf, pLeaf->nCell-1, nCell, &rc);
     if( rc ) return rc;
   }
-- 
2.47.2