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Author SHA1 Message Date
Max Kazantsev 5a10d127b9 [AliasSetTracker] Do not treat experimental_guard intrinsic as memory writing instruction 
The `experimental_guard` intrinsic has memory write semantics to model the thread-exiting
logic, but does not do any actual writes to memory. Currently, `AliasSetTracker` treats it as a
normal memory write. As result, a loop-invariant load cannot be hoisted out of loop because
the guard may possibly alias with it.

This patch makes `AliasSetTracker` so that it doesn't treat guards as memory writes.

Differential Revision: https://reviews.llvm.org/D50497
Reviewed By: reames

llvm-svn: 339753
 2018-08-15 06:21:02 +00:00
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