[PATCH] D31576: MemorySSA: Remove MemorySSA walker caching.

[Daniel Berlin via Phabricator via llvm-commits]

dberlin created this revision.
Herald added a subscriber: Prazek.

Remove all the caching the clobber walker does, and that the
caching walker does.  With the patch to enable storing clobbering
access results for stores, i can find no improvement with the cache
turned on (and a number of degradations, both time and memory, from
the cost of caching.  For a large program i have, we do millions of
lookups and inserts with zero hits).

I haven't tried to rename or simplify the walker otherwise yet.

(Appreciate some perf testing on this past my own testing)


https://reviews.llvm.org/D31576

Files:
  lib/Transforms/Utils/MemorySSA.cpp

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