[all-commits] [llvm/llvm-project] 664b18: Reland Pin -loop-reduce to legacy PM

[aeubanks via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 664b187160dc951c2cea3b69f92decf358d8e75a
      https://github.com/llvm/llvm-project/commit/664b187160dc951c2cea3b69f92decf358d8e75a
  Author: Arthur Eubanks <aeubanks at google.com>
  Date:   2020-12-09 (Wed, 09 Dec 2020)

  Changed paths:
    M llvm/tools/opt/opt.cpp

  Log Message:
  -----------
  Reland Pin -loop-reduce to legacy PM

This was accidentally reverted by a later change.

LSR currently only runs in the codegen pass manager.
There are a couple issues with LSR and the NPM.
1) Lots of tests assume that LCSSA isn't run before LSR. This breaks a
bunch of tests' expected output. This is fixable with some time put in.
2) LSR doesn't preserve LCSSA. See
llvm/test/Analysis/MemorySSA/update-remove-deadblocks.ll. LSR's use of
SCEVExpander is the only use of SCEVExpander where the PreserveLCSSA option is
off. Turning it on causes some code sinking out of loops to fail due to
SCEVExpander's inability to handle the newly created trivial PHI nodes in the
broken critical edge (I was looking at
llvm/test/Transforms/LoopStrengthReduce/X86/2011-11-29-postincphi.ll).
I also tried simply just calling formLCSSA() at the end of LSR, but the extra
PHI nodes cause regressions in codegen tests.

We'll delay figuring these issues out until later.

This causes the number of check-llvm failures with -enable-new-pm true
by default to go from 60 to 29.

Reviewed By: asbirlea

Differential Revision: https://reviews.llvm.org/D92796