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

[via llvm-commits]

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@@ -4071,15 +4093,25 @@ LoopVectorizationCostModel::computeMaxVF(ElementCount UserVF, unsigned UserIC) {
     InterleaveInfo.invalidateGroupsRequiringScalarEpilogue();
   }
 
-  FixedScalableVFPair MaxFactors = computeFeasibleMaxVF(MaxTC, UserVF, true);
+  // If we don't know the precise trip count, or if the trip count that we
+  // found modulo the vectorization factor is not zero, try to fold the tail
+  // by masking.
+  // FIXME: look for a smaller MaxVF that does divide TC rather than masking.
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ayalz wrote:

The comments above are out of context here - they are associated with early exiting on zero remainders below - when the loop is known to have no tail to fold.

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