[PATCH] D100803: [RISCV] Enable SPLAT_VECTOR for fixed vXi64 types on RV32.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
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This replaces D98479 <https://reviews.llvm.org/D98479>.

This allows type legalization to form SPLAT_VECTOR_PARTS so we don't
lose the splattedness when the scalar type is split.

I'm handling SPLAT_VECTOR_PARTS for fixed vectors separately so
we can continue using non-VL nodes for scalable vectors.

I limited to RV32+vXi64 because DAGCombiner::visitBUILD_VECTOR likes
to form SPLAT_VECTOR before seeing if it can replace the BUILD_VECTOR
with other operations. Especially interesting is a splat BUILD_VECTOR of
the extract_vector_elt which can become a splat shuffle, but won't if
we form SPLAT_VECTOR first. We either need to reorder visitBUILD_VECTOR
or add visitSPLAT_VECTOR.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D100803

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-shuffles.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-splat.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-vrgather.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-masked-load-int.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-masked-store-int.ll

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