[PATCH] D128191: [LoongArch] Combine ((x & shifted_mask) >> shamt) to bstrpick.{w/d}

[Lu Weining via Phabricator via llvm-commits]

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This is an improvement to LoongArch codegen. In D127206 <https://reviews.llvm.org/D127206> we combined
((x >> shamt) & shifted_mask) to bstrpick and here we do a similar
combination when certain conditions are met.

Thanks to @xen0n for reminding me.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128191

Files:
  llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
  llvm/test/CodeGen/LoongArch/bstrpick_d.ll
  llvm/test/CodeGen/LoongArch/bstrpick_w.ll
  llvm/test/CodeGen/LoongArch/ir-instruction/lshr.ll

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