[PATCH] D157583: [RISCV] Stop performFP_TO_INTCombine from folding with ISD::FRINT.

[Craig Topper via Phabricator via llvm-commits]

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FRINT was added to matchRoundingOp after this function was written.
So FRINT was not tested originally.

For vectors, folding this causes us to create a CSR swap that tries
to write 7 to FRM. This is an illegal value and will cause the CSR
write to fail.

While this might be a legal fold we could do, I'm disabling it for
now so we can backport to LLVM 17 with the least risk.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D157583

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/double-round-conv.ll
  llvm/test/CodeGen/RISCV/rvv/float-round-conv.ll
  llvm/test/CodeGen/RISCV/rvv/half-round-conv.ll

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