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Sam Parker 392ec3c3a9 [ARM][MVE] Add target flag for narrowing insts
Add a flag, 'RetainsPreviousHalfElement', for operations that operate
on top/bottom halves of their input and only write to half of their
destination, leaving the other half to retain its previous value.

Differential Revision: https://reviews.llvm.org/D76608
2020-03-24 08:36:44 +00:00
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