[PATCH] D94501: [SelectionDAG] Support scalable-vector splats in more cases

[Fraser Cormack via Phabricator via llvm-commits]

frasercrmck created this revision.
frasercrmck added reviewers: craig.topper, kmclaughlin, HsiangKai, rogfer01, evandro.
Herald added subscribers: ecnelises, luismarques, apazos, sameer.abuasal, pzheng, steven.zhang, s.egerton, Jim, jocewei, PkmX, the_o, brucehoult, MartinMosbeck, edward-jones, zzheng, jrtc27, niosHD, sabuasal, simoncook, johnrusso, rbar, asb, hiraditya.
frasercrmck requested review of this revision.
Herald added subscribers: llvm-commits, MaskRay.
Herald added a project: LLVM.

This patch adds support for scalable-vector splats in DAGCombiner's
`isConstantOrConstantVector` and `ISD::matchUnaryPredicate` functions,
which enable the SelectionDAG div/rem-by-constant optimizations for
scalable vector types.

It also fixes up one case where the UDIV optimization was generating a
SETCC without first consulting the target for its preferred SETCC result
type.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D94501

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/AArch64/sve-int-arith-imm.ll
  llvm/test/CodeGen/RISCV/rvv/vdiv-sdnode-rv32.ll
  llvm/test/CodeGen/RISCV/rvv/vdiv-sdnode-rv64.ll
  llvm/test/CodeGen/RISCV/rvv/vdivu-sdnode-rv32.ll
  llvm/test/CodeGen/RISCV/rvv/vdivu-sdnode-rv64.ll
  llvm/test/CodeGen/RISCV/rvv/vmulh-sdnode-rv32.ll
  llvm/test/CodeGen/RISCV/rvv/vrem-sdnode-rv32.ll
  llvm/test/CodeGen/RISCV/rvv/vrem-sdnode-rv64.ll
  llvm/test/CodeGen/RISCV/rvv/vremu-sdnode-rv32.ll
  llvm/test/CodeGen/RISCV/rvv/vremu-sdnode-rv64.ll

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