[PATCH] D54839: [CodeGen] Enhance machine PHIs optimization

[Anton Afanasyev via Phabricator via llvm-commits]

anton-afanasyev created this revision.
anton-afanasyev added reviewers: RKSimon, spatel, craig.topper, dtemirbulatov.
Herald added a subscriber: llvm-commits.

  Make machine PHIs optimization to work for single value register taken from
  several different copies. This is the first step to fix PR38917. This change
  allows to get rid of redundant PHIs (see `opt_phis2.mir` test) to make
  the subsequent optimizations (like CSE) possible and simpler.


Repository:
  rL LLVM

https://reviews.llvm.org/D54839

Files:
  lib/CodeGen/OptimizePHIs.cpp
  test/CodeGen/X86/madd.ll
  test/CodeGen/X86/opt_phis2.mir
  test/CodeGen/X86/sad.ll

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