[all-commits] [llvm/llvm-project] 20e6ad: [LoongArch] Combine ((x & shifted_mask) >> shamt) ...

Lu Weining via All-commits all-commits at lists.llvm.org
Thu Jun 23 02:20:49 PDT 2022

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 20e6ada2fb94a97e677c5493dd6c1886d416c91a
  Author: Weining Lu <luweining at loongson.cn>
  Date:   2022-06-23 (Thu, 23 Jun 2022)

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

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

This is an improvement to LoongArch codegen. In 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.

Differential Revision: https://reviews.llvm.org/D128191

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