[PATCH] D91040: [RISCV] Make ctlz/cttz cheap to speculatively execute so CodeGenPrepare won't insert a zero check.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: asb, luismarques, lenary, frasercrmck, lewis-revill, PaoloS.
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Add additional isel patterns for ctzw/clzw instructions.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D91040

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/lib/Target/RISCV/RISCVISelLowering.h
  llvm/lib/Target/RISCV/RISCVInstrInfoB.td
  llvm/test/CodeGen/RISCV/rv32Zbb.ll
  llvm/test/CodeGen/RISCV/rv64Zbb.ll

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