[PATCH] D107572: [DAG] DAGCombiner::visitVECTOR_SHUFFLE - recognise chain of INSERT_SUBVECTOR patterns

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri updated this revision to Diff 364523.
lebedev.ri added a comment.

In D107572#2928704 <https://reviews.llvm.org/D107572#2928704>, @RKSimon wrote:

> I'm working on a concat(concat,concat) fold that should help a lot more than this (although I might not get it finished before going on holiday next week) - what could be done as an extension of D107068 <https://reviews.llvm.org/D107068> is handle the case where the insert_subvector straddles multiple concat entries (i.e. slice the concat ops into a smaller concat and insert that as a subvector).

Hmm yeah, now that i have fixed the code to actually work as planned, it currently does not trigger on any of the existing tests.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D107572/new/

https://reviews.llvm.org/D107572

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

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