diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html
index eb12b339a47..fa986a85510 100644
--- a/docs/ReleaseNotes.html
+++ b/docs/ReleaseNotes.html
@@ -468,9 +468,10 @@ Release Notes</a>.</h1>
 
 <p> Loop Vectorizer - We've added a loop vectorizer and we are now able to
     vectorize small loops. The loop vectorizer is disabled by default and
-    can be enabled using the <b>-mllvm -vectorize</b> flag.
+    can be enabled using the <b>-mllvm -vectorize-loops</b> flag.
     The SIMD vector width can be specified using the flag
     <b>-mllvm -force-vector-width=4</b>.
+    The defaule value is <b>0</b> which means auto-select.
     <br/>
     We can now vectorize this code:
 
diff --git a/include/llvm/Transforms/IPO/PassManagerBuilder.h b/include/llvm/Transforms/IPO/PassManagerBuilder.h
index 47ce90265bd..68557bd5f67 100644
--- a/include/llvm/Transforms/IPO/PassManagerBuilder.h
+++ b/include/llvm/Transforms/IPO/PassManagerBuilder.h
@@ -103,7 +103,8 @@ public:
   bool DisableSimplifyLibCalls;
   bool DisableUnitAtATime;
   bool DisableUnrollLoops;
-  bool Vectorize;
+  bool BBVectorize;
+  bool LoopVectorize;
 
 private:
   /// ExtensionList - This is list of all of the extensions that are registered.
diff --git a/lib/Transforms/IPO/PassManagerBuilder.cpp b/lib/Transforms/IPO/PassManagerBuilder.cpp
index e3bc94e7e67..2b16e20e563 100644
--- a/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -33,7 +33,10 @@
 using namespace llvm;
 
 static cl::opt<bool>
-RunVectorization("vectorize", cl::desc("Run vectorization passes"));
+RunLoopVectorization("vectorize-loops", cl::desc("Run the Loop vectorization passes"));
+
+static cl::opt<bool>
+RunBBVectorization("vectorize", cl::desc("Run the BB vectorization passes"));
 
 static cl::opt<bool>
 UseGVNAfterVectorization("use-gvn-after-vectorization",
@@ -52,7 +55,8 @@ PassManagerBuilder::PassManagerBuilder() {
     DisableSimplifyLibCalls = false;
     DisableUnitAtATime = false;
     DisableUnrollLoops = false;
-    Vectorize = RunVectorization;
+    BBVectorize = RunBBVectorization;
+    LoopVectorize = RunLoopVectorization;
 }
 
 PassManagerBuilder::~PassManagerBuilder() {
@@ -185,7 +189,7 @@ void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
   MPM.add(createLoopIdiomPass());             // Recognize idioms like memset.
   MPM.add(createLoopDeletionPass());          // Delete dead loops
 
-  if (Vectorize) {
+  if (LoopVectorize) {
     MPM.add(createLoopVectorizePass());
     MPM.add(createLICMPass());
   }
@@ -208,7 +212,7 @@ void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
 
   addExtensionsToPM(EP_ScalarOptimizerLate, MPM);
 
-  if (Vectorize) {
+  if (BBVectorize) {
     MPM.add(createBBVectorizePass());
     MPM.add(createInstructionCombiningPass());
     if (OptLevel > 1 && UseGVNAfterVectorization)