[PATCH] D106652: [SelectionDAG] Support scalable splats in U(ADD|SUB)SAT combines

[Fraser Cormack via Phabricator via llvm-commits]

frasercrmck created this revision.
frasercrmck added reviewers: RKSimon, craig.topper.
Herald added subscribers: ecnelises, luismarques, apazos, sameer.abuasal, steven.zhang, s.egerton, Jim, jocewei, PkmX, the_o, brucehoult, MartinMosbeck, rogfer01, edward-jones, zzheng, jrtc27, niosHD, sabuasal, simoncook, johnrusso, rbar, asb, hiraditya.
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This patch builds on top of D106575 <https://reviews.llvm.org/D106575> in which scalable-vector splats were
supported in `ISD::matchBinaryPredicate`. It teaches the DAGCombiner how
to perform a variety of the pre-existing saturating add/sub combines on
scalable-vector types.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D106652

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/RISCV/rvv/combine-sats.ll

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