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Author SHA1 Message Date
Anh Tuyen Tran e7c5412b37 [NFC][LV][TEST]: extend pr45679-fold-tail-by-masking.ll with -force-vector-width=1 -force-vector-interleave=4 
Summary:
Add -force-vector-width=1 -force-vector-interleave=4 to pr45679-fold-tail-by-masking.ll

Author: anhtuyen (Anh Tuyen Tran)

Reviewers: Ayal (Ayal Zaks)

Reviewed By: Ayal (Ayal Zaks)

Subscribers: rkruppe (Hanna Kruppe), llvm-commits, LLVM

Tag: LLVM

Differential Revision: https://reviews.llvm.org/D80446
 2020-06-09 18:30:56 +00:00
Ayal Zaks 682e739638 [LV] Fix FoldTail under user VF and UF 
LV considers an internally computed MaxVF to decide if a constant trip-count is
a multiple of any subsequently chosen VF, and conclude that no scalar remainder
iterations (tail) will be left for Fold Tail to handle. If an external VF is
provided via -force-vector-width, it must be considered instead of the internal
MaxVF.
If an external UF is provided via -force-vector-interleave, it too must be
considered in addition to MaxVF or user VF.

Fixes PR45679.

Differential Revision: https://reviews.llvm.org/D80085
 2020-05-19 01:32:25 +03:00