Index: src/vdbeaux.c
==================================================================
--- src/vdbeaux.c
+++ src/vdbeaux.c
@@ -3316,10 +3316,22 @@
     sqlite3VdbeMemRelease(&c2);
     if( (v1==0 || v2==0) && prcErr ) *prcErr = SQLITE_NOMEM;
     return rc;
   }
 }
+
+/*
+** Compare two blobs.  Return negative, zero, or positive if the first
+** is less than, equal to, or greater than the second, respectively.
+** If one blob is a prefix of the other, then the shorter is the lessor.
+*/
+static SQLITE_NOINLINE int sqlite3BlobCompare(const Mem *pB1, const Mem *pB2){
+  int c = memcmp(pB1->z, pB2->z, pB1->n>pB2->n ? pB2->n : pB1->n);
+  if( c ) return c;
+  return pB1->n - pB2->n;
+}
+
 
 /*
 ** Compare the values contained by the two memory cells, returning
 ** negative, zero or positive if pMem1 is less than, equal to, or greater
 ** than pMem2. Sorting order is NULL's first, followed by numbers (integers
@@ -3327,11 +3339,10 @@
 ** sequence pColl and finally blob's ordered by memcmp().
 **
 ** Two NULL values are considered equal by this function.
 */
 int sqlite3MemCompare(const Mem *pMem1, const Mem *pMem2, const CollSeq *pColl){
-  int rc;
   int f1, f2;
   int combined_flags;
 
   f1 = pMem1->flags;
   f2 = pMem2->flags;
@@ -3402,15 +3413,11 @@
     /* If a NULL pointer was passed as the collate function, fall through
     ** to the blob case and use memcmp().  */
   }
  
   /* Both values must be blobs.  Compare using memcmp().  */
-  rc = memcmp(pMem1->z, pMem2->z, (pMem1->n>pMem2->n)?pMem2->n:pMem1->n);
-  if( rc==0 ){
-    rc = pMem1->n - pMem2->n;
-  }
-  return rc;
+  return sqlite3BlobCompare(pMem1, pMem2);
 }
 
 
 /*
 ** The first argument passed to this function is a serial-type that