[PATCH] D147400: [LoongArch] Optimize multiplication with immediates

[Ben Shi via Phabricator via llvm-commits]

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Optimize multiplication with some specific immediates to
a pair of `alsl`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147400

Files:
  llvm/lib/Target/LoongArch/LoongArchInstrInfo.td
  llvm/test/CodeGen/LoongArch/ir-instruction/mul.ll

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