[all-commits] [llvm/llvm-project] 6f86e6: [ARM][MVE] Add target flag for narrowing insts

[Sam Parker via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 6f86e6bf4043b0fc75d285bac06ebc7c3f5828b0
      https://github.com/llvm/llvm-project/commit/6f86e6bf4043b0fc75d285bac06ebc7c3f5828b0
  Author: Sam Parker <sam.parker at arm.com>
  Date:   2020-03-24 (Tue, 24 Mar 2020)

  Changed paths:
    M llvm/lib/Target/ARM/ARMInstrFormats.td
    M llvm/lib/Target/ARM/ARMInstrMVE.td
    M llvm/lib/Target/ARM/MCTargetDesc/ARMBaseInfo.h
    M llvm/unittests/Target/ARM/MachineInstrTest.cpp

  Log Message:
  -----------
  [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