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Author SHA1 Message Date
Chad Rosier 8f348017b0 [AliasSetTracker] Make AST smarter about assume intrinsics that don't actually affect memory. 
Differential Revision: https://reviews.llvm.org/D26252

llvm-svn: 286108
 2016-11-07 14:11:45 +00:00
Chad Rosier 4447d7a816 Revert "[AliasSetTracker] Make AST smarter about intrinsics that don't actually affect memory." 
This reverts commit r285191.

LICM appears to rely on the Alias Set Tracker hitting lifetime markers to prevent
code from being moved outside of the original scope.

llvm-svn: 285227
 2016-10-26 19:18:19 +00:00
Chad Rosier 1408628ffa [AliasSetTracker] Make AST smarter about intrinsics that don't actually affect memory. 
Differential Revision: https://reviews.llvm.org/D25969

llvm-svn: 285191
 2016-10-26 12:42:11 +00:00
Chad Rosier 6e3a92ec88 [AliasSetTracker] Add support for memcpy and memmove. 
Differential Revision: https://reviews.llvm.org/D25776

llvm-svn: 284630
 2016-10-19 19:09:03 +00:00
Michael Kuperstein 41898f0396 [AliasSetTracker] Degrade AliasSetTracker when may-alias sets get too large. 
Repeated inserts into AliasSetTracker have quadratic behavior - inserting a
pointer into AST is linear, since it requires walking over all "may" alias
sets and running an alias check vs. every pointer in the set.

We can avoid this by tracking the total number of pointers in "may" sets,
and when that number exceeds a threshold, declare the tracker "saturated".
This lumps all pointers into a single "may" set that aliases every other
pointer.

(This is a stop-gap solution until we migrate to MemorySSA)

This fixes PR28832.
Differential Revision: https://reviews.llvm.org/D23432

llvm-svn: 279274
 2016-08-19 17:05:22 +00:00