[PATCH] D158271: [RISCV] Lower build_vec vid sequences when addend/step doesn't fit in imm

[Luke Lau via Phabricator via llvm-commits]

luke created this revision.
luke added reviewers: craig.topper, reames, frasercrmck.
Herald added subscribers: jobnoorman, asb, sunshaoce, pmatos, VincentWu, vkmr, luismarques, apazos, sameer.abuasal, s.egerton, Jim, benna, psnobl, jocewei, PkmX, the_o, brucehoult, MartinMosbeck, rogfer01, edward-jones, zzheng, jrtc27, shiva0217, kito-cheng, niosHD, sabuasal, simoncook, johnrusso, rbar, hiraditya, arichardson.
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Herald added subscribers: llvm-commits, wangpc, eopXD, MaskRay.
Herald added a project: LLVM.

Previously the addend and step had to fit into the immediate of the
corresponding vadd/vshl. This patch relaxes the constraint so that it uses the
cost model added in D157976 <https://reviews.llvm.org/D157976> to determine whether or not it's profitable.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158271

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/active_lane_mask.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-fp-interleave.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-buildvec.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-interleave.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-reduction-int-vp.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-shuffle-reverse.ll
  llvm/test/CodeGen/RISCV/rvv/shuffle-reverse.ll

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