[PATCH] D91267: [ARM] Remove copies from low overhead phi inductions.

[Dave Green via Phabricator via llvm-commits]

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

The phi created in a low overhead loop gets created with a default register class it seems. There are then copied inserted between the low overhead loop pseudo instructions (which produce/consume GPRlr instructions) and the phi holding the induction. This patch removes those as a step towards attempting to make t2LoopDec and t2LoopEnd a single instruction, and appears useful in it's own right as shown in the tests.


https://reviews.llvm.org/D91267

Files:
  llvm/lib/Target/ARM/MVETPAndVPTOptimisationsPass.cpp
  llvm/test/CodeGen/Thumb2/mve-gather-scatter-tailpred.ll
  llvm/test/CodeGen/Thumb2/mve-postinc-lsr.ll
  llvm/test/CodeGen/Thumb2/mve-pred-vctpvpsel.ll

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