[llvm] [LoopVectorizer][AArch64] Move getMinTripCountTailFoldingThreshold later. (PR #132170)

[Florian Hahn via llvm-commits]

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@@ -4087,11 +4087,8 @@ LoopVectorizationCostModel::computeMaxVF(ElementCount UserVF, unsigned UserIC) {
       MaxPowerOf2RuntimeVF = std::nullopt; // Stick with tail-folding for now.
   }
 
-  if (MaxPowerOf2RuntimeVF && *MaxPowerOf2RuntimeVF > 0) {
-    assert((UserVF.isNonZero() || isPowerOf2_32(*MaxPowerOf2RuntimeVF)) &&
-           "MaxFixedVF must be a power of 2");
-    unsigned MaxVFtimesIC =
-        UserIC ? *MaxPowerOf2RuntimeVF * UserIC : *MaxPowerOf2RuntimeVF;
+  auto IsKnownModTripCountZero = [this, &UserIC](unsigned MaxVF) {
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fhahn wrote:

Might be more descriptive to name something like `ScalarEpilogueNeeded` ?

https://github.com/llvm/llvm-project/pull/132170