https://bugs.llvm.org/show_bug.cgi?id=33126
Bug ID: 33126
Summary: MemorySSA could cache alias query results more
aggressively
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: dav...@freebsd.org
CC: dber...@dberlin.org, george.burgess...@gmail.com,
llvm-bugs@lists.llvm.org
Dumping this one here, for whomever gets to it first (as I have a terrible
memory, and probably will forget in a day or two).
Dan run ./opt -memoryssa on clang.bc and statistics return:
1175012 memoryssa - Number of MemorySSA alias queries
360784 memoryssa - Number of MemorySSA duplicate pointer queries
Which is a pretty significant amount of duplicate queries.
In the conducted experiments, caching everything saves 20% of MemorySSA time,
but the amount of memory used could be a concern for large testcases (e.g.
LTO).
Probably using a smarter cache could lead to substantial benefits without
memory usage going crazy. It's unclear what's the best policy, maybe LRU is a
good starting point.
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