From 0f825a7e264f8c058d7865dce67203c033d3098b Mon Sep 17 00:00:00 2001
From: drh <drh@noemail.net>
Date: Sat, 13 Aug 2016 14:17:02 +0000
Subject: [PATCH] Remove an unnecessary stack variable from sqlite3VdbeExec().

FossilOrigin-Name: c54bd9c82dd34951dc87848c0b19fcccaef928db
---
 manifest      | 12 ++++++------
 manifest.uuid |  2 +-
 src/vdbe.c    | 27 +++++++++++++--------------
 3 files changed, 20 insertions(+), 21 deletions(-)

diff --git a/manifest b/manifest
index 23cd1d16e7..032853f761 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Improvements\sto\scommits.\s\sNo\scode\schanges.
-D 2016-08-13T13:03:46.411
+C Remove\san\sunnecessary\sstack\svariable\sfrom\ssqlite3VdbeExec().
+D 2016-08-13T14:17:02.223
 F Makefile.in cfd8fb987cd7a6af046daa87daa146d5aad0e088
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc d66d0395c38571aab3804f8db0fa20707ae4609a
@@ -450,7 +450,7 @@ F src/update.c 4f05ea8cddfa367d045e03589756c02199e8f9bd
 F src/utf.c 699001c79f28e48e9bcdf8a463da029ea660540c
 F src/util.c 810ec3f22e2d1b62e66c30fe3621ebdedd23584d
 F src/vacuum.c 9dd2f5d276bc6094d8f1d85ecd41b30c1a002a43
-F src/vdbe.c 3961408d1e4507b468b6297b79307bd3eee51988
+F src/vdbe.c 1b66646c30ae83db67edce52f62801e6204a6e47
 F src/vdbe.h 67bc551f7faf04c33493892e4b378aada823ed10
 F src/vdbeInt.h c59381049af5c7751a83456c39b80d1a6fde1f9d
 F src/vdbeapi.c c3f6715a99995c11748ecad91d25e93fd9fc390b
@@ -1516,7 +1516,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P ec70a67ebc997f457be4d52d8affc37e142dc3ff
-R 247af002c746a42b304e23bb96c4f14d
+P 18f5a3bee4f870be4644a6042a20081c46edb7d0
+R 4db42b6f0c7885d63148768f55fefe94
 U drh
-Z 092630ac00e90be639ed64dcd2fc60ce
+Z 3f3cd455e86203369782a9bcddee8cc7
diff --git a/manifest.uuid b/manifest.uuid
index efc7c5409f..c50c6baf38 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-18f5a3bee4f870be4644a6042a20081c46edb7d0
\ No newline at end of file
+c54bd9c82dd34951dc87848c0b19fcccaef928db
\ No newline at end of file
diff --git a/src/vdbe.c b/src/vdbe.c
index f401f65bcd..1578d2d87e 100644
--- a/src/vdbe.c
+++ b/src/vdbe.c
@@ -573,7 +573,7 @@ int sqlite3VdbeExec(
   sqlite3 *db = p->db;       /* The database */
   u8 resetSchemaOnFault = 0; /* Reset schema after an error if positive */
   u8 encoding = ENC(db);     /* The database encoding */
-  int iCompare = 0;          /* Result of last OP_Compare operation */
+  int iCompare = 0;          /* Result of last comparison */
   unsigned nVmStep = 0;      /* Number of virtual machine steps */
 #ifndef SQLITE_OMIT_PROGRESS_CALLBACK
   unsigned nProgressLimit = 0;/* Invoke xProgress() when nVmStep reaches this */
@@ -585,7 +585,6 @@ int sqlite3VdbeExec(
   Mem *pOut = 0;             /* Output operand */
   int *aPermute = 0;         /* Permutation of columns for OP_Compare */
   i64 lastRowid = db->lastRowid;  /* Saved value of the last insert ROWID */
-  int cmpRes;                /* Result of last comparison operation */
 #ifdef VDBE_PROFILE
   u64 start;                 /* CPU clock count at start of opcode */
 #endif
@@ -2004,16 +2003,16 @@ case OP_Ge: {             /* same as TK_GE, jump, in1, in3 */
        && (flags3&MEM_Null)!=0
        && (flags3&MEM_Cleared)==0
       ){
-        cmpRes = 0;  /* Operands are equal */
+        iCompare = 0;  /* Operands are equal */
       }else{
-        cmpRes = 1;  /* Operands are not equal */
+        iCompare = 1;  /* Operands are not equal */
       }
     }else{
       /* SQLITE_NULLEQ is clear and at least one operand is NULL,
       ** then the result is always NULL.
       ** The jump is taken if the SQLITE_JUMPIFNULL bit is set.
       */
-      cmpRes = 1;    /* Operands are not equal */
+      iCompare = 1;    /* Operands are not equal */
       if( pOp->p5 & SQLITE_STOREP2 ){
         pOut = &aMem[pOp->p2];
         memAboutToChange(p, pOut);
@@ -2066,15 +2065,15 @@ case OP_Ge: {             /* same as TK_GE, jump, in1, in3 */
       sqlite3VdbeMemExpandBlob(pIn3);
       flags3 &= ~MEM_Zero;
     }
-    cmpRes = sqlite3MemCompare(pIn3, pIn1, pOp->p4.pColl);
+    iCompare = sqlite3MemCompare(pIn3, pIn1, pOp->p4.pColl);
   }
   switch( pOp->opcode ){
-    case OP_Eq:    res = cmpRes==0;     break;
-    case OP_Ne:    res = cmpRes!=0;     break;
-    case OP_Lt:    res = cmpRes<0;      break;
-    case OP_Le:    res = cmpRes<=0;     break;
-    case OP_Gt:    res = cmpRes>0;      break;
-    case OP_Ge:    res = cmpRes>=0;     break;
+    case OP_Eq:    res = iCompare==0;     break;
+    case OP_Ne:    res = iCompare!=0;     break;
+    case OP_Lt:    res = iCompare<0;      break;
+    case OP_Le:    res = iCompare<=0;     break;
+    case OP_Gt:    res = iCompare>0;      break;
+    default:       res = iCompare>=0;     break;
   }
 
   /* Undo any changes made by applyAffinity() to the input registers. */
@@ -2116,8 +2115,8 @@ case OP_Ge: {             /* same as TK_GE, jump, in1, in3 */
 case OP_ElseNotEq: {       /* same as TK_ESCAPE, jump */
   assert( pOp>aOp );
   assert( pOp[-1].opcode==OP_Lt || pOp[-1].opcode==OP_Gt );
-  VdbeBranchTaken(cmpRes!=0, 2);
-  if( cmpRes!=0 ) goto jump_to_p2;
+  VdbeBranchTaken(iCompare!=0, 2);
+  if( iCompare!=0 ) goto jump_to_p2;
   break;
 }
 
-- 
2.39.5