Nirav Dave 6ce9f72f76 [DAGCombine] Improve alias analysis for chain of independent stores. ...

FindBetterNeighborChains simulateanously improves the chain
dependencies of a chain of related stores avoiding the generation of
extra token factors. For chains longer than the GatherAllAliasDepths,
stores further down in the chain will necessarily fail, a potentially
significant waste and preventing otherwise trivial parallelization.

This patch directly parallelize the chains of stores before improving
each store. This generally improves DAG-level parallelism.

Reviewers: courbet, spatel, RKSimon, bogner, efriedma, craig.topper, rnk

Subscribers: sdardis, javed.absar, hiraditya, jrtc27, atanasyan, llvm-commits

Differential Revision: https://reviews.llvm.org/D53552

llvm-svn: 346432

2018-11-08 19:14:20 +00:00

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