[llvm] [LV]Initial support for safe distance in predicated DataWithEVL vectorization mode. (PR #102897)

[Florian Hahn via llvm-commits]

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@@ -4106,15 +4133,11 @@ LoopVectorizationCostModel::computeMaxVF(ElementCount UserVF, unsigned UserIC) {
     if (Rem->isZero()) {
       // Accept MaxFixedVF if we do not have a tail.
       LLVM_DEBUG(dbgs() << "LV: No tail will remain for any chosen VF.\n");
+      disableTailFolding();
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fhahn wrote:

> 2. I'm afraid there might be some side effects, if we'll keep tail-folding mode ON, while it is OFF. Better explicitly set it to OFF, I think

Agreed, I was suggesting if it is possible to keep `setTailFoldingStyles` at its original place and then try to maximize MaxScalableVF below where we already deal with the EVL case ( `if (getTailFoldingStyle() == TailFoldingStyle::DataWithEVL) {` below)

https://github.com/llvm/llvm-project/pull/102897