[llvm] [LV][AArch64] Prefer epilogue with fixed-width over scalable VF in case of equal costs. (PR #155546)

[Florian Hahn via llvm-commits]

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@@ -1815,7 +1815,7 @@ class TargetTransformInfo {
   /// \returns True if the targets prefers fixed width vectorization if the
   /// loop vectorizer's cost-model assigns an equal cost to the fixed and
   /// scalable version of the vectorized loop.
-  LLVM_ABI bool preferFixedOverScalableIfEqualCost() const;
+  LLVM_ABI bool preferFixedOverScalableIfEqualCost(bool IsEpilogue) const;
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fhahn wrote:

should be documented

https://github.com/llvm/llvm-project/pull/155546