dd018df8a00e841fe38fabe38520b7d297a885c1 |
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09-Aug-2017 |
Igor Murashkin <iam@google.com> |
optimizing: add block-scoped constructor fence merging pass Introduce a new "Constructor Fence Redundancy Elimination" pass. The pass currently performs local optimization only, i.e. within instructions in the same basic block. All constructor fences preceding a publish (e.g. store, invoke) get merged into one instruction. ============== OptStat#ConstructorFenceGeneratedNew: 43825 OptStat#ConstructorFenceGeneratedFinal: 17631 <+++ OptStat#ConstructorFenceRemovedLSE: 164 OptStat#ConstructorFenceRemovedPFRA: 9391 OptStat#ConstructorFenceRemovedCFRE: 16133 <--- Removes ~91.5% of the 'final' constructor fences in RitzBenchmark: (We do not distinguish the exact reason that a fence was created, so it's possible some "new" fences were also removed.) ============== Test: art/test/run-test --host --optimizing 476-checker-ctor-fence-redun-elim Bug: 36656456 Change-Id: I8020217b448ad96ce9b7640aa312ae784690ad99
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