[PATCH] D42600: [WIP][Shrink-wrap]split restore point

[Jun Bum Lim via Phabricator via llvm-commits]

junbuml created this revision.
junbuml added reviewers: qcolombet, thegameg.
Herald added subscribers: javed.absar, mcrosier.

This change split a restore point to allow it to only post-dominate blocks reachable by use or def of CSRs/FI.

This is a WIP and I'm posting it to continue the discussion about :

  Bugzilla : https://bugs.llvm.org/show_bug.cgi?id=33868

I will be happy to hear any high level comment/suggestion.

This change itself increase 15% more shrink-wrapping in spec2000/2006/2017 benchmarks. I observed 160% more shrink-wrapping in spec2000/2006/2017 benchmarks if we apply the copy forwarding (https://reviews.llvm.org/D41835), PostRASink (https://reviews.llvm.org/D41463), and this change all together.


https://reviews.llvm.org/D42600

Files:
  lib/CodeGen/ShrinkWrap.cpp
  test/CodeGen/AArch64/srink-wrap-split-restore.ll

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