[PATCH] D69945: [ARM][MVE] Tail predication conversion

[Sam Parker via Phabricator via llvm-commits]

samparker created this revision.
samparker added reviewers: SjoerdMeijer, dmgreen.
Herald added subscribers: hiraditya, kristof.beyls.
Herald added a project: LLVM.
samparker edited the summary of this revision.

This patch modifies ARMLowOverheadLoops to convert a predicated vector low-overhead loop into a tail-predicatd one. This is currently a very basic conversion, with the following restrictions:

- Operates only on single block loops.
- The loop can only contain a single vctp instruction.
- No other instructions can write to the vpr.
- We only allow a subset of the mve instructions in the loop.

Most of the changes are because the logic has been moved around. We now have a LowOverheadLoop object to hold, track and check the current state of the loop and its legality.


https://reviews.llvm.org/D69945

Files:
  llvm/lib/Target/ARM/ARMInstrMVE.td
  llvm/lib/Target/ARM/ARMLowOverheadLoops.cpp
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/fast-fp-loops.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/mve-tail-data-types.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/vector-arith-codegen.ll

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