[PATCH] D96153: [ARM] Make v2f62 scalar_to_vector legal

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: SjoerdMeijer, NickGuy, efriedma, simon_tatham, ostannard.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls.
dmgreen requested review of this revision.
Herald added a project: LLVM.

Because we mark all operations as expand for v2f64, scalar_to_vector would end up lowering through a stack store/reload. But it is pretty simple to implement, only inserting a D reg into an undef vector. This helps clear up some inefficient codegen from soft calling conventions.


https://reviews.llvm.org/D96153

Files:
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/lib/Target/ARM/ARMInstrMVE.td
  llvm/test/CodeGen/Thumb2/mve-extractstore.ll
  llvm/test/CodeGen/Thumb2/mve-shuffle.ll

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