[PATCH] D51839: [TableGen] CodeGenDAGPatterns::GenerateVariants - full caching of matching predicates

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: kparzysz, sdardis, dsanders, fhahn, rengolin, andreadb.

Further extension to https://reviews.llvm.org/D51035, this patch avoids all repeated predicates[] matching by caching as it collects the patterns that have multiple variants.

Saves around 25secs in debug builds of x86 -gen-dag-isel (and finally gets its runtime below 7mins!).


Repository:
  rL LLVM

https://reviews.llvm.org/D51839

Files:
  utils/TableGen/CodeGenDAGPatterns.cpp

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