[PATCH] D104436: [RISCV] Optimize mul-add in the zbs extension with SH*ADD

[Ben Shi via Phabricator via llvm-commits]

benshi001 created this revision.
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This patch does the following optimization.

Rx + Ry * 6  => (SH1ADD (SH2ADD Rx, Ry), Ry)
Rx + Ry * 10 => (SH1ADD (SH3ADD Rx, Ry), Ry)
Rx + Ry * 12 => (SH2ADD (SH3ADD Rx, Ry), Ry)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D104436

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

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