[LV] Remove unnecessary variable from InnerLoopVectorizer::createBitOrPointerCast. NFC

Summary:
DstVTy is already a VectorType, we don't need to cast it again. This
used to be a cast to FixedVectorType that was changed to support
scalable vectors.

Test Plan: 

Reviewers: 

Subscribers: 

Tasks: 

Tags: 


Differential Revision: https://phabricator.intern.facebook.com/D60250980

Author: topperc

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -2767,18 +2767,17 @@ InnerLoopVectorizer::getOrCreateVectorTripCount(BasicBlock *InsertBlock) {
 Value *InnerLoopVectorizer::createBitOrPointerCast(Value *V, VectorType *DstVTy,
                                                    const DataLayout &DL) {
   // Verify that V is a vector type with same number of elements as DstVTy.
-  auto *DstFVTy = cast<VectorType>(DstVTy);
-  auto VF = DstFVTy->getElementCount();
+  auto VF = DstVTy->getElementCount();
   auto *SrcVecTy = cast<VectorType>(V->getType());
   assert(VF == SrcVecTy->getElementCount() && "Vector dimensions do not match");
   Type *SrcElemTy = SrcVecTy->getElementType();
-  Type *DstElemTy = DstFVTy->getElementType();
+  Type *DstElemTy = DstVTy->getElementType();
   assert((DL.getTypeSizeInBits(SrcElemTy) == DL.getTypeSizeInBits(DstElemTy)) &&
          "Vector elements must have same size");
 
   // Do a direct cast if element types are castable.
   if (CastInst::isBitOrNoopPointerCastable(SrcElemTy, DstElemTy, DL)) {
-    return Builder.CreateBitOrPointerCast(V, DstFVTy);
+    return Builder.CreateBitOrPointerCast(V, DstVTy);
   }
   // V cannot be directly casted to desired vector type.
   // May happen when V is a floating point vector but DstVTy is a vector of
@@ -2792,7 +2791,7 @@ Value *InnerLoopVectorizer::createBitOrPointerCast(Value *V, VectorType *DstVTy,
       IntegerType::getIntNTy(V->getContext(), DL.getTypeSizeInBits(SrcElemTy));
   auto *VecIntTy = VectorType::get(IntTy, VF);
   Value *CastVal = Builder.CreateBitOrPointerCast(V, VecIntTy);
-  return Builder.CreateBitOrPointerCast(CastVal, DstFVTy);
+  return Builder.CreateBitOrPointerCast(CastVal, DstVTy);
 }
 
 void InnerLoopVectorizer::emitIterationCountCheck(BasicBlock *Bypass) {