Ayal Zaks d15df0ede5 [LV] Fold tail by masking - handle reductions ...

Allow vectorizing loops that have reductions when tail is folded by masking.
A select is introduced in VPlan, choosing between the last value carried by the
loop-exit/live-out instruction of the reduction, and the penultimate value
carried by the reduction phi, according to the "i < n" mask of fold-tail.
This select replaces the last value as the live-out value of the loop.

Differential Revision: https://reviews.llvm.org/D66720

llvm-svn: 370173

2019-08-28 09:02:23 +00:00

27 KiB

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