[llvm] [LoopVectorize] Improve Vectorization of Small Loops (PR #195823)

[Jack Styles via llvm-commits]

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@@ -3023,9 +3033,37 @@ LoopVectorizationCostModel::computeMaxVF(ElementCount UserVF, unsigned UserIC) {
           NoScalarEpilogueNeeded(MaxFactors.FixedVF.getFixedValue())) {
         LLVM_DEBUG(dbgs() << "LV: Picking a fixed-width so that no tail will "
                              "remain for any chosen VF.\n");
-        MaxFactors.ScalableVF = ElementCount::getScalable(0);
+        ApplyVectorWidth(MaxFactors, MaxFactors.FixedVF.getFixedValue(), 0);
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Stylie777 wrote:

I've removed this and gone back to the original behaviour.

https://github.com/llvm/llvm-project/pull/195823