[PATCH] D79976: [LV] Handle Fold-Tail of loops with vectorizarion factor (VF) equal to 1

[Ayal Zaks via Phabricator via llvm-commits]

Ayal accepted this revision.
Ayal added a comment.
This revision is now accepted and ready to land.

This looks good to me, thanks! Please wait a day or so if @fhahn has further comments.

As noted, it would now be good to also extend pr45679-fold-tail-by-masking.ll with an additional RUN of -force-vector-width=1 and -force-vector-interleave=4.



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Comment at: llvm/test/Transforms/LoopVectorize/tail-folding-vectorization-factor-1.ll:107
+for.body:
+  %addr = phi double* [ %ptr, %for.body ], [ %ptr1, %entry ]
+  %ptr = getelementptr inbounds double, double* %addr, i64 1
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Interesting; this test w/o a primary IV seems to work ok w/o the patch; comparing pairs of vectors of size 1...




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