[PATCH] D70790: [ARM] Favour post inc for MVE loops

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: samparker, SjoerdMeijer, simon_tatham, ostannard.
Herald added subscribers: hiraditya, kristof.beyls.
Herald added a project: LLVM.

We were previously not necessarily favouring postinc for the MVE loads and stores, leading to extra code prior to the loop to set up the preinc. MVE in general can benefit from postinc (as we don't have unrolled loops), and certain instructions like the VLD2's only offset post-inc versions.


https://reviews.llvm.org/D70790

Files:
  llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
  llvm/lib/Target/ARM/ARMTargetTransformInfo.h
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/mve-float-loops.ll
  llvm/test/CodeGen/Thumb2/mve-vmla.ll

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