[PATCH] D60133: [DAGCombiner] Improve detection of unmergable stores, based on type size (WIP)

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added a reviewer: niravd.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.

Note: this is WIP, there is still one case where we exit early
unnecessarily.

By constructing the VT for a merged store upfront and using that to
check if merging is legal, we can exit early in some more cases.

This speeds up some variations of PR41263, where we have lots of i64
stores.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D60133

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

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