[PATCH] D142966: [AArch64] Don't create ST2 for 64bit store that requires a EXT

Dave Green via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Tue Jan 31 02:09:24 PST 2023


dmgreen created this revision.
dmgreen added reviewers: SjoerdMeijer, samtebbs, jaykang10, labrinea.
Herald added subscribers: hiraditya, kristof.beyls.
Herald added a project: All.
dmgreen requested review of this revision.
Herald added a project: LLVM.

A 64bit st2 which does not start at element 0 will involved adding extra ext elements, making the st2 unprofitable. This prevents that case which can lead to a few less instructions.


https://reviews.llvm.org/D142966

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/vldn_shuffle.ll

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