[PATCH] D98599: [AArch64] Zero extended extract_vector_elt pattern

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: fhahn, efriedma, SjoerdMeijer, NickGuy, t.p.northover.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls.
dmgreen requested review of this revision.
Herald added a project: LLVM.

This adds a pattern for i64 zext_inreg(i32 extract_vector_elt X), producing a single UMOVvi16 instruction that is already expected to clear the top bits.  The exact pattern that this matches is and(anyext(vector_extract X, lane), 0xff), similar to the sext patterns higher up in the same file.


https://reviews.llvm.org/D98599

Files:
  llvm/lib/Target/AArch64/AArch64InstrInfo.td
  llvm/test/CodeGen/AArch64/build-vector-extract.ll

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