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List:       openjdk-hotspot-gc-dev
Subject:    Request for Review (S) 6852078: HSX 14/16 in jdk 5.0: api/javax_management api/org_omg jck tests cra
From:       Changpeng.Fang () Sun ! COM (Changpeng Fang)
Date:       2009-10-29 22:58:35
Message-ID: 4AEA1E1B.6020302 () sun ! com
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 http://cr.openjdk.java.net/~cfang/6852078/webrev.00/

Note that I am requesting for change to the current jdk source (For the 
SubCR)

6852078: HSX 14/16 in jdk 5.0: api/javax_management api/org_omg jck 
tests crashes or make tnameserv crash

Problem: Current implementation of superword optimization does not check 
for unsafe memory accesses. Since
unsafe memory accesses could not be aligned appropriately without 
runtime checking, a un-aligned superword
read/write could cause runtime failure.

Solution: Simply disable superword for unsafe memory access whose base 
is top.

Tests: Test case in 6852078

Thanks,

Changpeng


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