[PATCH] D125160: [InstCombine] Reassociate add sequences to reduce dependency chains

[Chenbing.Zheng via Phabricator via llvm-commits]

Chenbing.Zheng created this revision.
Chenbing.Zheng added reviewers: RKSimon, spatel, 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.

Reassociate add sequences to reduce dependency chains:
((A + B) + C) + D --> (A + B) + (C + D)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125160

Files:
  llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
  llvm/test/Transforms/InstCombine/X86/x86-avx512-inseltpoison.ll
  llvm/test/Transforms/InstCombine/X86/x86-avx512.ll
  llvm/test/Transforms/InstCombine/X86/x86-vec_demanded_elts-inseltpoison.ll
  llvm/test/Transforms/InstCombine/X86/x86-vec_demanded_elts.ll
  llvm/test/Transforms/InstCombine/add.ll
  llvm/test/Transforms/InstCombine/call-guard.ll
  llvm/test/Transforms/LoopVectorize/reduction-inloop.ll
  llvm/test/Transforms/LoopVectorize/reduction-predselect.ll
  llvm/test/Transforms/PhaseOrdering/X86/scalarization-inseltpoison.ll
  llvm/test/Transforms/PhaseOrdering/X86/scalarization.ll
  llvm/test/Transforms/PhaseOrdering/X86/vector-reductions.ll

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