Nirav Dave fa250cad37 Prevent construction of cycle in DAG store merge ... When merging stores in DAGCombiner, add check to ensure that no dependenices exist that would cause the construction of a cycle in our DAG. This may happen if one store has a data dependence on another instruction (e.g. a load) which itself has a (chain) dependence on another store being merged. These stores cannot be merged safely and doing so results in a cycle that is discovered in LegalizeDAG. This test is only done in cases where Antialias analysis is used (UseAA) as non-AA store merge candidates will be merged logically after all loads which have been checked to not alias. Reviewers: ahatanak, spatel, niravd, arsenm, hfinkel, tstellarAMD, jyknight Subscribers: llvm-commits, tberghammer, danalbert, srhines Differential Revision: http://reviews.llvm.org/D18336 llvm-svn: 264461		2016-03-25 21:06:30 +00:00
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llvm	Prevent construction of cycle in DAG store merge	2016-03-25 21:06:30 +00:00
llvm-c	Expose IRBuilder::CreateAtomicCmpXchg as LLVMBuildAtomicCmpXchg in the C API.	2016-03-19 21:28:28 +00:00