[PATCH] D94392: [ARM] Add low overhead loops terminators to AnalyzeBranch

[Dave Green via Phabricator via llvm-commits]

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

This treats low overhead loop branches the same as jump tables and indirect branches in analyzeBranch - they cannot be analyzed but the direct branches on the end of the block may be removed. This helps remove the unnecessary branches earlier, which can help produce better codegen (and change block layout in a number of cases).


https://reviews.llvm.org/D94392

Files:
  llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
  llvm/lib/Target/ARM/ARMBaseInstrInfo.h
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/fast-fp-loops.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/mve-float-loops.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/sibling-loops.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/varying-outer-2d-reduction.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/vcmp-vpst-combination.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/while-loops.ll
  llvm/test/CodeGen/Thumb2/mve-float16regloops.ll
  llvm/test/CodeGen/Thumb2/mve-float32regloops.ll
  llvm/test/CodeGen/Thumb2/mve-gather-increment.ll
  llvm/test/CodeGen/Thumb2/mve-gather-scatter-optimisation.ll
  llvm/test/CodeGen/Thumb2/mve-gather-tailpred.ll
  llvm/test/CodeGen/Thumb2/mve-satmul-loops.ll
  llvm/test/CodeGen/Thumb2/mve-scatter-increment.ll
  llvm/test/CodeGen/Thumb2/mve-vecreduce-loops.ll
  llvm/test/CodeGen/Thumb2/mve-vldshuffle.ll

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