[PATCH] D125198: [InstCombine] ((A + B) + C) + A --> (A << 1) + (B + C)

[Chenbing.Zheng via Phabricator via llvm-commits]

Chenbing.Zheng created this revision.
Chenbing.Zheng added reviewers: spatel, RKSimon, benshi001.
Chenbing.Zheng added a project: LLVM.
Herald added a subscriber: hiraditya.
Herald added a project: All.
Chenbing.Zheng requested review of this revision.
Herald added subscribers: llvm-commits, jacquesguan.

This patch deal with 3 add sequences, which include the same op
in firse add and third add:
((A + B) + C) + A --> (A << 1) + (B + C)
((A + B) + C) + B --> (B << 1) + (A + C)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125198

Files:
  llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
  llvm/test/Transforms/InstCombine/add.ll

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