[PATCH] D132322: [AArch64][SelectionDAG] Optimize multiplication by constant

[Allen zhong via Phabricator via llvm-commits]

Allen created this revision.
Allen added reviewers: dmgreen, paulwalker-arm, luismarques, MaskRay, nikic.
Herald added subscribers: StephenFan, ecnelises, hiraditya, kristof.beyls.
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InstCombine will merge the x*5+x into x*6,
then decompose MUL By const into shift/add or shift/sub.
Fixes AArch64 part of https://github.com/llvm/llvm-project/issues/57255.


https://reviews.llvm.org/D132322

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.h
  llvm/test/CodeGen/AArch64/arm64-mul.ll
  llvm/test/CodeGen/AArch64/arm64_32.ll
  llvm/test/CodeGen/AArch64/machine-combiner-madd.ll
  llvm/test/CodeGen/AArch64/mul_pow2.ll
  llvm/test/CodeGen/AArch64/srem-seteq-illegal-types.ll
  llvm/test/CodeGen/AArch64/sve-intrinsics-counting-elems-i32.ll
  llvm/test/CodeGen/AArch64/sve-intrinsics-counting-elems.ll
  llvm/test/CodeGen/AArch64/typepromotion-phisret.ll
  llvm/test/CodeGen/AArch64/urem-seteq-illegal-types.ll
  llvm/test/Transforms/SeparateConstOffsetFromGEP/AArch64/split-gep.ll

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