[PATCH] D121137: [AArch64] Lower 3 and 4 sources buildvectors to TBL

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: SjoerdMeijer, sdesmalen, samtebbs, jaykang10, fhahn.
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The default expansion for buildvectors is to extract each element and insert them into a new vector. That involves a lot of copying to/from the GPR registers. TLB3 and TLB4 can be relatively slow instructions with the mask needing to be loaded from a constant pool, but they are at least better than all the moves to/from GPRs.


https://reviews.llvm.org/D121137

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/fptosi-sat-vector.ll
  llvm/test/CodeGen/AArch64/fptoui-sat-vector.ll
  llvm/test/CodeGen/AArch64/neon-extracttruncate.ll
  llvm/test/CodeGen/AArch64/shuffle-tbl34.ll
  llvm/test/CodeGen/AArch64/tbl-loops.ll

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