[llvm] [VPlan] Remove loop region in optimizeForVFAndUF. (PR #108378)

[Alexey Bataev via llvm-commits]

================
@@ -692,16 +692,46 @@ void VPlanTransforms::optimizeForVFAndUF(VPlan &Plan, ElementCount BestVF,
       !SE.isKnownPredicate(CmpInst::ICMP_ULE, TripCount, C))
     return;
 
-  LLVMContext &Ctx = SE.getContext();
-  auto *BOC =
-      new VPInstruction(VPInstruction::BranchOnCond,
-                        {Plan.getOrAddLiveIn(ConstantInt::getTrue(Ctx))});
-
   SmallVector<VPValue *> PossiblyDead(Term->operands());
   Term->eraseFromParent();
+  auto *Header = cast<VPBasicBlock>(Plan.getVectorLoopRegion()->getEntry());
+  if (all_of(Header->phis(), [](VPRecipeBase &R) {
+        return !isa<VPWidenIntOrFpInductionRecipe, VPReductionPHIRecipe>(&R);
+      })) {
----------------
alexey-bataev wrote:

```suggestion
  if (none_of(Header->phis(), IsaPred<VPWidenIntOrFpInductionRecipe, VPReductionPHIRecipe>)) {
```


https://github.com/llvm/llvm-project/pull/108378