RFR(s): 8013171: G1: C1 x86_64 barriers use 32-bit accesses to 64-bit PtrQueue::_index
per.liden at oracle.com
Thu Apr 23 08:52:21 UTC 2015
(This change affects G1, but it's touching code in C1 so I'd like to ask
someone from the compiler team to also reviewed this)
Summary: The G1 barriers loads and updates the PrtQueue::_index field.
This field is a size_t but the C1 version of these barriers aren't
64-bit clean. The bug has more details.
In addition I've massaged the code a little bit, so that the 32-bit and
64-bit sections look more similar (and as a bonus I think we avoid an
extra memory load on 32-bit).
* gc-test-suite on both 32 and 64-bit builds (with -XX:+UseG1GC
-XX:+TieredCompilation -XX:TieredStopAtLevel=3 -XX:+VerifyAfterGC)
* Passes jprt
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