[PATCH] D104515: [ARM] Lower MVETRUNC to stack operations

[Dave Green via Phabricator via llvm-commits]

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

The MVETRUNC node truncates two wide vectors to a single vector with narrower elements. This is usually lowered to a series of extract/insert elements, going via GPR registers. This patch changes that to instead use a pair of truncating stores and a stack reload. This cuts down the number of instructions at the expense of some stack space.


https://reviews.llvm.org/D104515

Files:
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/test/CodeGen/Thumb2/mve-laneinterleaving.ll
  llvm/test/CodeGen/Thumb2/mve-scatter-ind16-unscaled.ll
  llvm/test/CodeGen/Thumb2/mve-scatter-ind8-unscaled.ll
  llvm/test/CodeGen/Thumb2/mve-sext.ll

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