[PATCH] D118920: [DAGCombiner] Fold `ty1 extract_vector(ty2 splat(V)) -> t1 splat(V)`

[Sander de Smalen via Phabricator via llvm-commits]

sdesmalen created this revision.
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This seems like an obvious fold, which leads to a few improvements.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D118920

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/AArch64/sve-extract-scalable-vector.ll
  llvm/test/CodeGen/AArch64/sve-insert-vector.ll
  llvm/test/CodeGen/AArch64/sve-st1-addressing-mode-reg-imm.ll
  llvm/test/CodeGen/RISCV/rvv/vadd-vp.ll

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