[PATCH] D135833: [RISCV] Match (select C, -1, X)->(or -C, X) during lowerSelect

[Craig Topper via Phabricator via llvm-commits]

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Same with (select C, X, -1), (select C, 0, X), and (select C, X, 0).

There's a DAGCombine after we turn the select into select_cc, but
that may introduce a setcc that didn't previously exist. We could
add more DAGCombines to remove the extra setcc, but this seemed lower
effort.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D135833

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/double-convert.ll
  llvm/test/CodeGen/RISCV/double-round-conv-sat.ll
  llvm/test/CodeGen/RISCV/float-convert.ll
  llvm/test/CodeGen/RISCV/float-round-conv-sat.ll
  llvm/test/CodeGen/RISCV/forced-atomics.ll
  llvm/test/CodeGen/RISCV/fpclamptosat.ll
  llvm/test/CodeGen/RISCV/fpclamptosat_vec.ll
  llvm/test/CodeGen/RISCV/half-convert.ll
  llvm/test/CodeGen/RISCV/half-round-conv-sat.ll
  llvm/test/CodeGen/RISCV/min-max.ll
  llvm/test/CodeGen/RISCV/rv64zbb.ll
  llvm/test/CodeGen/RISCV/selectcc-to-shiftand.ll
  llvm/test/CodeGen/RISCV/uadd_sat.ll
  llvm/test/CodeGen/RISCV/uadd_sat_plus.ll
  llvm/test/CodeGen/RISCV/usub_sat.ll
  llvm/test/CodeGen/RISCV/usub_sat_plus.ll
  llvm/test/CodeGen/RISCV/vec3-setcc-crash.ll

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