[PATCH] D130698: [AArch64][DAGCombine] Add performBuildVectorCombine 'extract_elt ~> anyext'

[Peter Waller via Phabricator via llvm-commits]

peterwaller-arm created this revision.
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A build vector of two extracted elements is equivalent to an extract
subvector where the inner vector is any-extended to the
extract_vector_elt VT, because extract_vector_elt has the effect of an
any-extend.

  (build_vector (extract_elt_i16_to_i32 vec Idx+0) (extract_elt_i16_to_i32 vec Idx+1))
  => (extract_subvector (anyext_i16_to_i32 vec) Idx)

Depends on D130697 <https://reviews.llvm.org/D130697>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D130698

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/bitcast-promote-widen.ll
  llvm/test/CodeGen/AArch64/sve-fixed-length-extract-subvector.ll
  llvm/test/CodeGen/AArch64/sve-fixed-length-masked-gather.ll
  llvm/test/CodeGen/AArch64/sve-fixed-length-masked-loads.ll
  llvm/test/CodeGen/AArch64/sve-fixed-length-masked-scatter.ll
  llvm/test/CodeGen/AArch64/sve-fixed-length-masked-stores.ll
  llvm/test/CodeGen/AArch64/vector-fcvt.ll

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