[PATCH] D131729: [RISCV] Move xori creation for scalar setccs to lowering.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
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This patch enables expansion or custom lowering for some integer
condition codes so that any xori that is needed is created before
the last DAG combine to enable optimization.

I've seen cases where we end up with
(or (xori (setcc), 1), (xori (setcc), 1)) which we would ideally
convert to (xori (and (setcc), (setcc)), 1). This patch doesn't
accomplish that yet, but it should allow us to add DAG
combines as follow ups. Example https://godbolt.org/z/Y4qnvsq1b


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D131729

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/lib/Target/RISCV/RISCVInstrInfo.td
  llvm/lib/Target/RISCV/RISCVInstrInfoZb.td
  llvm/test/CodeGen/RISCV/rv32zbt.ll
  llvm/test/CodeGen/RISCV/select-cc.ll
  llvm/test/CodeGen/RISCV/urem-seteq-illegal-types.ll
  llvm/test/CodeGen/RISCV/xaluo.ll

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