From 76694c3ae5dc7f7a0b92e1e8e45d477936057537 Mon Sep 17 00:00:00 2001
From: drh <drh@noemail.net>
Date: Thu, 21 Nov 2013 03:43:12 +0000
Subject: [PATCH] A simple change to the OP_Function opcode improves overall
 performance by about 0.5%.

FossilOrigin-Name: b890eefd57fbd189f7df611e82eb1fb4b197e1c3
---
 manifest      | 12 ++++++------
 manifest.uuid |  2 +-
 src/vdbe.c    |  9 ++++-----
 3 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/manifest b/manifest
index 96d39f59d5..ecd4861c86 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Performance\soptimization\sto\sthe\sOP_Next\sand\sOP_Prev\sopcodes.
-D 2013-11-21T03:12:25.082
+C A\ssimple\schange\sto\sthe\sOP_Function\sopcode\simproves\soverall\sperformance\sby\nabout\s0.5%.
+D 2013-11-21T03:43:12.554
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 8a07bebafbfda0eb67728f4bd15a36201662d1a1
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -280,7 +280,7 @@ F src/update.c c05a0ee658f1a149e0960dfd110f3b8bd846bcb0
 F src/utf.c 6fc6c88d50448c469c5c196acf21617a24f90269
 F src/util.c 2fa6c821d28bbdbeec1b2a7b091a281c9ef8f918
 F src/vacuum.c 3728d74919d4fb1356f9e9a13e27773db60b7179
-F src/vdbe.c 1aabde68130182a3cceb70d1c59122b93244b97e
+F src/vdbe.c 9d8490d65b06d2e21dd0f0e6286c07e7f3095a48
 F src/vdbe.h c06f0813f853566457ce9cfb1a4a4bc39a5da644
 F src/vdbeInt.h 0ac03c790b8ea4568b747550ba9bbf92a8e8feb2
 F src/vdbeapi.c 93a22a9ba2abe292d5c2cf304d7eb2e894dde0ed
@@ -1140,7 +1140,7 @@ F tool/vdbe-compress.tcl f12c884766bd14277f4fcedcae07078011717381
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh d1a6de74685f360ab718efda6265994b99bbea01
 F tool/win/sqlite.vsix 030f3eeaf2cb811a3692ab9c14d021a75ce41fff
-P 972881c6d394c199961f01dcbeb4a6e8b5c919a1
-R d4a5420dc1635b387e6b0a099e73a8c3
+P ecaac28a2e78aca148fc614fe54bf2706aed8be2
+R 33f1c98c35afb745f70ac2d0738f01fc
 U drh
-Z 0f90f7ea40ab09ca14f9f529358ed102
+Z a8c7ba243cd2d2fb4fb7b6cf27c27770
diff --git a/manifest.uuid b/manifest.uuid
index f6fdc094e7..c568fbf63a 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-ecaac28a2e78aca148fc614fe54bf2706aed8be2
\ No newline at end of file
+b890eefd57fbd189f7df611e82eb1fb4b197e1c3
\ No newline at end of file
diff --git a/src/vdbe.c b/src/vdbe.c
index 57a0e39429..e94c885045 100644
--- a/src/vdbe.c
+++ b/src/vdbe.c
@@ -1487,10 +1487,6 @@ case OP_Function: {
 
   assert( pOp->p4type==P4_FUNCDEF );
   ctx.pFunc = pOp->p4.pFunc;
-  ctx.s.flags = MEM_Null;
-  ctx.s.db = db;
-  ctx.s.xDel = 0;
-  ctx.s.zMalloc = 0;
   ctx.iOp = pc;
   ctx.pVdbe = p;
 
@@ -1498,7 +1494,10 @@ case OP_Function: {
   ** the pointer to ctx.s so in case the user-function can use
   ** the already allocated buffer instead of allocating a new one.
   */
-  sqlite3VdbeMemMove(&ctx.s, pOut);
+  memcpy(&ctx.s, pOut, sizeof(Mem));
+  pOut->flags = MEM_Null;
+  pOut->xDel = 0;
+  pOut->zMalloc = 0;
   MemSetTypeFlag(&ctx.s, MEM_Null);
 
   ctx.fErrorOrAux = 0;