[PATCH] D104180: [NFC] [LICM] Create LoopNest Invariant Code Motion (LNICM) pass

[toshiki maekawa via Phabricator via llvm-commits]

uint256_t added a comment.

> As the patch is written I am concerned that this appears to mostly duplicate the existing code of LICM (which adds a maintenance burden) and just changes the type of the pass.

I'll update the code to contain less duplication. I'm sorry to trouble you.

> Could you elaborate on what kind of improvements you plan on adding using LoopNest?

With LoopNest pass, it'll be easy to efficiently hoist invariants in nested loop out of the nested loop at once.

  for (i = 0 to 10) 
     for (k = 0 to 10) 
        j = invariant * 2;


Repository:
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  https://reviews.llvm.org/D104180/new/

https://reviews.llvm.org/D104180