In the VDBE loop, only check for OOM errors at jumps rather than after every

opcode, for about a 0.5% performance increase.

FossilOrigin-Name: 632071bac5ff324a74cec9bdbba2deb60c0945e9

manifest

@@ -1,5 +1,5 @@
-C Improve\sperformance\sof\sfts5\sprefix\squeries\son\sdetail=col\stables.
-D 2016-02-03T20:04:59.805
+C In\sthe\sVDBE\sloop,\sonly\scheck\sfor\sOOM\serrors\sat\sjumps\srather\sthan\safter\severy\nopcode,\sfor\sabout\sa\s0.5%\sperformance\sincrease.
+D 2016-02-03T22:14:38.812
 F Makefile.in 027c1603f255390c43a426671055a31c0a65fdb4
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 72b7858f02017611c3ac1ddc965251017fed0845
@@ -413,7 +413,7 @@ F src/update.c 17332f9fe818cbc0444c36a811800af8498af4c3
 F src/utf.c 10cc2519e82e3369344d0969ad4b1a333dc86d18
 F src/util.c 72d40df0a52d3f30b462a15f0e094fcbade6dc82
 F src/vacuum.c 2ddd5cad2a7b9cef7f9e431b8c7771634c6b1701
-F src/vdbe.c 16ca0c1e2975fac04c3ea5c62b34dc24b13fea13
+F src/vdbe.c f0c2e2fb8cbff761ea8602058406c151b9325e8d
 F src/vdbe.h 7a733ea8aac1b77305a67698e784fa3484ee3337
 F src/vdbeInt.h 4b69d5451bcadd473e745af53ef1e8abfdce0a79
 F src/vdbeapi.c 9d640d5efd9a140a6bda8da53b220aa258167993
@@ -1423,7 +1423,7 @@ F tool/vdbe_profile.tcl 246d0da094856d72d2c12efec03250d71639d19f
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh 48bd54594752d5be3337f12c72f28d2080cb630b
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P ef252bc4b59d272460aaebdc0d4b8e347b0d25a8
-R 671ea22942ad2d2bcb9568b9e59d452e
-U dan
-Z 34c6688fd340fcbe0aee4e43e23acf72
+P ca11f46db047e7f131cef3893f73824758a2076b
+R 59ea01ed7c88b6674116d0bfaf73cf15
+U drh
+Z 96f5f7409c64154023cc6759eed6c5b3

manifest.uuid

@@ -1 +1 @@
-ca11f46db047e7f131cef3893f73824758a2076b
+632071bac5ff324a74cec9bdbba2deb60c0945e9

src/vdbe.c

@@ -629,7 +629,6 @@ int sqlite3VdbeExec(
 #endif
   for(pOp=&aOp[p->pc]; rc==SQLITE_OK; pOp++){
     assert( pOp>=aOp && pOp<&aOp[p->nOp]);
-    if( db->mallocFailed ) goto no_mem;
 #ifdef VDBE_PROFILE
     start = sqlite3Hwtime();
 #endif
@@ -754,14 +753,16 @@ jump_to_p2_and_check_for_interrupt:
   /* Opcodes that are used as the bottom of a loop (OP_Next, OP_Prev,
   ** OP_VNext, OP_RowSetNext, or OP_SorterNext) all jump here upon
   ** completion.  Check to see if sqlite3_interrupt() has been called
-  ** or if the progress callback needs to be invoked. 
+  ** or if the progress callback needs to be invoked. Also check for
+  ** OOM conditions and abort if seen.
   **
   ** This code uses unstructured "goto" statements and does not look clean.
   ** But that is not due to sloppy coding habits. The code is written this
   ** way for performance, to avoid having to run the interrupt and progress
-  ** checks on every opcode.  This helps sqlite3_step() to run about 1.5%
+  ** checks on every opcode.  This helps sqlite3_step() to run over 2.0%
   ** faster according to "valgrind --tool=cachegrind" */
 check_for_interrupt:
+  if( db->mallocFailed ) goto no_mem;
   if( db->u1.isInterrupted ) goto abort_due_to_interrupt;
 #ifndef SQLITE_OMIT_PROGRESS_CALLBACK
   /* Call the progress callback if it is configured and the required number