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3 Commits

Author SHA1 Message Date
David Green 48230355e9 [ARM] Remove DLS lr, lr 
A DLS lr, lr instruction only moves lr to itself. It need not be emitted
on it's own to save a instruction in the loop preheader.

Differential Revision: https://reviews.llvm.org/D78916
 2021-02-02 11:09:31 +00:00
David Green f5abf0bd48 [ARM] Tail predication with constant loop bounds 
The TripCount for a predicated vector loop body will be
ceil(ElementCount/Width). This alters the conversion of an
active.lane.mask to a VCPT intrinsics to match.

Differential Revision: https://reviews.llvm.org/D94608
 2021-01-15 18:17:31 +00:00
David Green a0770f9e4e [ARM] Constant tripcount tail predication loop tests. NFC 2021-01-15 18:02:07 +00:00