[PATCH] D67909: [ARM] Split large widening MVE loads

[Dave Green via Phabricator via llvm-commits]

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

Similar to D67828 <https://reviews.llvm.org/D67828>, we can force the splitting of extends of vector loads in MVE, in order to use the better widening loads as opposed to going through expensive extends. This adds a combine to early-on detect extends of loads and split the load in two, from where normal legalisation will kick in and we get a series of widening loads.


https://reviews.llvm.org/D67909

Files:
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/test/CodeGen/Thumb2/mve-widen-narrow.ll

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