rename IBase to MainOp

Author: HanKuanChen

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

@@ -916,6 +916,7 @@ static InstructionsState getSameOpcode(ArrayRef<Value *> VL,
     return InstructionsState::invalid();
 
   Value *V = *It;
+  Instruction *MainOp = cast<Instruction>(V);
   unsigned InstCnt = std::count_if(It, VL.end(), IsaPred<Instruction>);
   if ((VL.size() > 2 && !isa<PHINode>(V) && InstCnt < VL.size() / 2) ||
       (VL.size() == 2 && InstCnt < 2))
@@ -955,10 +956,9 @@ static InstructionsState getSameOpcode(ArrayRef<Value *> VL,
   }();
   // Check for one alternate opcode from another BinaryOperator.
   // TODO - generalize to support all operators (types, calls etc.).
-  auto *IBase = cast<Instruction>(V);
   Intrinsic::ID BaseID = 0;
   SmallVector<VFInfo> BaseMappings;
-  if (auto *CallBase = dyn_cast<CallInst>(IBase)) {
+  if (auto *CallBase = dyn_cast<CallInst>(MainOp)) {
     BaseID = getVectorIntrinsicIDForCall(CallBase, &TLI);
     BaseMappings = VFDatabase(*CallBase).getMappings(*CallBase);
     if (!isTriviallyVectorizable(BaseID) && BaseMappings.empty())
@@ -986,7 +986,7 @@ static InstructionsState getSameOpcode(ArrayRef<Value *> VL,
         continue;
       }
     } else if (IsCastOp && isa<CastInst>(I)) {
-      Value *Op0 = IBase->getOperand(0);
+      Value *Op0 = MainOp->getOperand(0);
       Type *Ty0 = Op0->getType();
       Value *Op1 = I->getOperand(0);
       Type *Ty1 = Op1->getType();
@@ -1045,17 +1045,17 @@ static InstructionsState getSameOpcode(ArrayRef<Value *> VL,
              "CastInst.");
       if (auto *Gep = dyn_cast<GetElementPtrInst>(I)) {
         if (Gep->getNumOperands() != 2 ||
-            Gep->getOperand(0)->getType() != IBase->getOperand(0)->getType())
+            Gep->getOperand(0)->getType() != MainOp->getOperand(0)->getType())
           return InstructionsState::invalid();
       } else if (auto *EI = dyn_cast<ExtractElementInst>(I)) {
         if (!isVectorLikeInstWithConstOps(EI))
           return InstructionsState::invalid();
       } else if (auto *LI = dyn_cast<LoadInst>(I)) {
-        auto *BaseLI = cast<LoadInst>(IBase);
+        auto *BaseLI = cast<LoadInst>(MainOp);
         if (!LI->isSimple() || !BaseLI->isSimple())
           return InstructionsState::invalid();
       } else if (auto *Call = dyn_cast<CallInst>(I)) {
-        auto *CallBase = cast<CallInst>(IBase);
+        auto *CallBase = cast<CallInst>(MainOp);
         if (Call->getCalledFunction() != CallBase->getCalledFunction())
           return InstructionsState::invalid();
         if (Call->hasOperandBundles() &&