[SVE] Eliminate calls to default-false VectorType::get() from Vectorize

[ctetreau]

ping?

[ctetreau]

rebase

[efriedma]

LGTM

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

case Instruction::Br: {
     BranchInst *BI = cast<BranchInst>(I);
     if (VF > 1 && BI->isConditional() &&
         (PredicatedBBsAfterVectorization.count(BI->getSuccessor(0)) ||
          PredicatedBBsAfterVectorization.count(BI->getSuccessor(1))))
       ScalarPredicatedBB = true;
 
     if (ScalarPredicatedBB) {
       // Return cost for branches around scalarized and predicated blocks.
-      VectorType *Vec_i1Ty =
-          VectorType::get(IntegerType::getInt1Ty(RetTy->getContext()), VF);
+      auto *Vec_i1Ty =
+          FixedVectorType::get(IntegerType::getInt1Ty(RetTy->getContext()), VF);
       return (TTI.getScalarizationOverhead(Vec_i1Ty, APInt::getAllOnesValue(VF),
                                            false, true) +
               (TTI.getCFInstrCost(Instruction::Br, CostKind) * VF));
     } else if (I->getParent() == TheLoop->getLoopLatch() || VF == 1)
       // The back-edge branch will remain, as will all scalar branches.
       return TTI.getCFInstrCost(Instruction::Br, CostKind);
     else
       // This branch will be eliminated by if-conversion.
       return 0;
     // Note: We currently assume zero cost for an unconditional branch inside
     // a predicated block since it will become a fall-through, although we
     // may decide in the future to call TTI for all branches.
   }
   case Instruction::PHI: {
     auto *Phi = cast<PHINode>(I);
 
     // First-order recurrences are replaced by vector shuffles inside the loop.
     // NOTE: Don't use ToVectorTy as SK_ExtractSubvector expects a vector type.
     if (VF > 1 && Legal->isFirstOrderRecurrence(Phi))
       return TTI.getShuffleCost(TargetTransformInfo::SK_ExtractSubvector,
                                 cast<VectorType>(VectorTy), VF - 1,
-                                VectorType::get(RetTy, 1));
+                                FixedVectorType::get(RetTy, 1));
 
     // Phi nodes in non-header blocks (not inductions, reductions, etc.) are
     // converted into select instructions. We require N - 1 selects per phi
     // node, where N is the number of incoming values.
     if (VF > 1 && Phi->getParent() != TheLoop->getHeader())
       return (Phi->getNumIncomingValues() - 1) *
              TTI.getCmpSelInstrCost(
                  Instruction::Select, ToVectorTy(Phi->getType(), VF),

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

 int BoUpSLP::getEntryCost(TreeEntry *E) {
   ArrayRef<Value*> VL = E->Scalars;
 
   Type *ScalarTy = VL[0]->getType();
   if (StoreInst *SI = dyn_cast<StoreInst>(VL[0]))
     ScalarTy = SI->getValueOperand()->getType();
   else if (CmpInst *CI = dyn_cast<CmpInst>(VL[0]))
     ScalarTy = CI->getOperand(0)->getType();
-  VectorType *VecTy = VectorType::get(ScalarTy, VL.size());
+  auto *VecTy = FixedVectorType::get(ScalarTy, VL.size());
   TTI::TargetCostKind CostKind = TTI::TCK_RecipThroughput;
 
   // If we have computed a smaller type for the expression, update VecTy so
   // that the costs will be accurate.
   if (MinBWs.count(VL[0]))
-    VecTy = VectorType::get(
+    VecTy = FixedVectorType::get(
         IntegerType::get(F->getContext(), MinBWs[VL[0]].first), VL.size());
 
   unsigned ReuseShuffleNumbers = E->ReuseShuffleIndices.size();
   bool NeedToShuffleReuses = !E->ReuseShuffleIndices.empty();
   int ReuseShuffleCost = 0;
   if (NeedToShuffleReuses) {
     ReuseShuffleCost =
         TTI->getShuffleCost(TargetTransformInfo::SK_PermuteSingleSrc, VecTy);
for (ExternalUser &EU : ExternalUses) {
     // removed prior to code generation, and so the extraction will be
     // removed as well).
     if (EphValues.count(EU.User))
       continue;
 
     // If we plan to rewrite the tree in a smaller type, we will need to sign
     // extend the extracted value back to the original type. Here, we account
     // for the extract and the added cost of the sign extend if needed.
-    auto *VecTy = VectorType::get(EU.Scalar->getType(), BundleWidth);
+    auto *VecTy = FixedVectorType::get(EU.Scalar->getType(), BundleWidth);
     auto *ScalarRoot = VectorizableTree[0]->Scalars[0];
     if (MinBWs.count(ScalarRoot)) {
       auto *MinTy = IntegerType::get(F->getContext(), MinBWs[ScalarRoot].first);
       auto Extend =
           MinBWs[ScalarRoot].second ? Instruction::SExt : Instruction::ZExt;
-      VecTy = VectorType::get(MinTy, BundleWidth);
+      VecTy = FixedVectorType::get(MinTy, BundleWidth);
       ExtractCost += TTI->getExtractWithExtendCost(Extend, EU.Scalar->getType(),
                                                    VecTy, EU.Lane);
     } else {
       ExtractCost +=
           TTI->getVectorInstrCost(Instruction::ExtractElement, VecTy, EU.Lane);
     }
   }
 
int BoUpSLP::getGatherCost(VectorType *Ty,
   return Cost;
 }
 
 int BoUpSLP::getGatherCost(ArrayRef<Value *> VL) const {
   // Find the type of the operands in VL.
   Type *ScalarTy = VL[0]->getType();
   if (StoreInst *SI = dyn_cast<StoreInst>(VL[0]))
     ScalarTy = SI->getValueOperand()->getType();
-  VectorType *VecTy = VectorType::get(ScalarTy, VL.size());
+  auto *VecTy = FixedVectorType::get(ScalarTy, VL.size());
   // Find the cost of inserting/extracting values from the vector.
   // Check if the same elements are inserted several times and count them as
   // shuffle candidates.
   DenseSet<unsigned> ShuffledElements;
   DenseSet<Value *> UniqueElements;
   // Iterate in reverse order to consider insert elements with the high cost.
   for (unsigned I = VL.size(); I > 0; --I) {
     unsigned Idx = I - 1;
unsigned numReductionValues() const {
     return ReducedVals.size();
   }
 
 private:
   /// Calculate the cost of a reduction.
   int getReductionCost(TargetTransformInfo *TTI, Value *FirstReducedVal,
                        unsigned ReduxWidth) {
     Type *ScalarTy = FirstReducedVal->getType();
-    VectorType *VecTy = VectorType::get(ScalarTy, ReduxWidth);
+    auto *VecTy = FixedVectorType::get(ScalarTy, ReduxWidth);
 
     int PairwiseRdxCost;
     int SplittingRdxCost;
     switch (ReductionData.getKind()) {
     case RK_Arithmetic:
       PairwiseRdxCost =
           TTI->getArithmeticReductionCost(ReductionData.getOpcode(), VecTy,
                                           /*IsPairwiseForm=*/true);