[all-commits] [llvm/llvm-project] be762b: [RISCV] Efficiently lower (select cond, u, rot[r/l...

[Ryan Buchner via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: be762b7b7d60f47ab75e81942c8899331d89f141
      https://github.com/llvm/llvm-project/commit/be762b7b7d60f47ab75e81942c8899331d89f141
  Author: Ryan Buchner <92571492+bababuck at users.noreply.github.com>
  Date:   2025-07-03 (Thu, 03 Jul 2025)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/zicond-opts.ll

  Log Message:
  -----------
  [RISCV] Efficiently lower (select cond, u, rot[r/l](u, rot.amt)) using zicond extension (#143768)

The following lowerings now occur:
(select cond, u, rotr(u, rot.amt)) -> (rotr u, (czero_nez rot.amt,
cond))
(select cond, rotr(u, rot.amt), u) -> (rotr u, (czero_eqz rot.amt,
cond))
(select cond, u, rotl(u, rot.amt)) -> (rotl u, (czero_nez rot.amt,
cond))
(select cond, rotl(u, rot.amt), u) -> (rotl u, (czero_eqz rot.amt,
cond))



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