[PATCH] D104772: [RISCV] Lower RVV vector SELECTs to VSELECTs

[Fraser Cormack via Phabricator via llvm-commits]

frasercrmck created this revision.
frasercrmck added reviewers: craig.topper, rogfer01, HsiangKai, evandro, khchen, arcbbb.
Herald added subscribers: vkmr, luismarques, apazos, sameer.abuasal, s.egerton, Jim, benna, psnobl, jocewei, PkmX, the_o, brucehoult, MartinMosbeck, edward-jones, zzheng, jrtc27, shiva0217, kito-cheng, 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 optimizes the code generation of vector-type SELECTs (LLVM
select instructions with scalar conditions) by custom-lowering to
VSELECTs (LLVM select instructions with vector conditions) by splatting
the condition to a vector. This avoids the default expansion path which
would either introduce control flow or fully scalarize.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D104772

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-select-fp.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-select-int.ll
  llvm/test/CodeGen/RISCV/rvv/select-fp.ll
  llvm/test/CodeGen/RISCV/rvv/select-int.ll

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