Additional cleanup to enable more broadcasts

ctx.h

@@ -297,7 +297,7 @@ public:
 
     /** Generate ConstantVector, which contains ProgramIndex, i.e.
         < i32 0, i32 1, i32 2, i32 3> */
-    llvm::Value *ProgramIndex();
+    llvm::Value *ProgramIndexVector(bool is32bits = true);
 
     /** Given a string, create an anonymous global variable to hold its
         value and return the pointer to the string. */
@@ -504,9 +504,16 @@ public:
     llvm::Value *InsertInst(llvm::Value *v, llvm::Value *eltVal, int elt,
                             const char *name = NULL);
 
+    /** This convenience method maps to an llvm::ShuffleVectorInst. */
     llvm::Value *ShuffleInst(llvm::Value *v1, llvm::Value *v2, llvm::Value *mask,
                             const char *name = NULL);
 
+    /** This convenience method to generate broadcast pattern. It takes a value
+        and a vector type. Type of the value must match element type of the
+        vector. */
+    llvm::Value *BroadcastValue(llvm::Value *v, llvm::Type *vecType,
+                                const char *name = NULL);
+
     llvm::PHINode *PhiNode(llvm::Type *type, int count,
                            const char *name = NULL);
     llvm::Instruction *SelectInst(llvm::Value *test, llvm::Value *val0,