[PATCH] D51424: [ARM] Exchange MAC operands in ARMParallelDSP

[Sam Parker via Phabricator via llvm-commits]

samparker created this revision.
samparker added a reviewer: SjoerdMeijer.
Herald added a reviewer: javed.absar.
Herald added subscribers: chrib, kristof.beyls.

SMLAD and SMLALD instructions also come in the form of SMLADX and SMLALDX which perform an exchange on their second operand. To support this, more of the loads in the MAC candidates are compared for sequential access and a boolean value has been added to BinOpChain.

AddMACCandiate has been refactored into a small pattern matching state machine to reduce the amount of duplicated code, but also to enable the matching to be more flexible. CreateParallelMACPairs now iterates through all the candidates to find parallel ones.


https://reviews.llvm.org/D51424

Files:
  lib/Target/ARM/ARMParallelDSP.cpp
  test/CodeGen/ARM/smladx-1.ll
  test/CodeGen/ARM/smlaldx-1.ll
  test/CodeGen/ARM/smlaldx-2.ll

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