RFR(XS) 8059780: SPECjvm2008-MPEG performance regressions on x64 platforms
vladimir.kozlov at oracle.com
Sat Nov 1 00:55:14 UTC 2014
We found performance regression (3-5%) on x64 after changes 8052081 
were pushed. It is caused by changes in lcm.cpp. Those changes were done
because Atom is in-order cpu and some benchmarks on Atom showed benefit
from these changes.
But Atom is not our core platform and the regression is big.
Backout changes made in lcm.cpp in jdk9 and 8u40 (8052081 was backported
We have RFEs to improve block's instructions order which may help both
Tested with SPECjvm2008-mpegaudio.
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