[PATCH] D108551: [RISCV] Make more optimization for multiplication in the zba extension with SH*ADD.

[Jianjian Guan via Phabricator via llvm-commits]

jacquesguan created this revision.
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This patch make the following optimization.

(mul x, 2 + power_of_2) -> (SH1ADD x, (SLLI x, bits))
(mul x, 4 + power_of_2) -> (SH2ADD x, (SLLI x, bits))
(mul x, 8 + power_of_2) -> (SH3ADD x, (SLLI x, bits))


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D108551

Files:
  llvm/lib/Target/RISCV/RISCVInstrInfoB.td
  llvm/test/CodeGen/RISCV/rv32zba.ll
  llvm/test/CodeGen/RISCV/rv64zba.ll

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