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http://jira.codehaus.org/browse/RVM-341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=178846#action_178846 ]
Ian Rogers commented on RVM-341:
--------------------------------
On new architectures the advice from Intel is clear, use "rep movsq". There is microcoded goodness to avoid unnecessary partial cache line fills. Intel still expect the stores to be aligned.
> Improved copying in VM_Memory
> -----------------------------
>
> Key: RVM-341
> URL:
http://jira.codehaus.org/browse/RVM-341> Project: RVM
> Issue Type: Improvement
> Components: Instruction Architecture: Intel, Runtime
> Reporter: Ian Rogers
> Fix For: 1000
>
> Attachments: memcpyTest.java, memcpyTestC.c
>
>
> r13857 improved memory copying for Intel with SSE2 so that we used 64bit copies rather than 32bit copies. This gave a large number of speed ups:
>
http://jikesrvm.anu.edu.au/cattrack/results/rvmx86lnx32.anu.edu.au/perf/1790/performance_report> most notably on SpecJBB 2000. There is a low-hanging fruit to improve this further, for example, by using 128bit copies and using more than 1 register to do the copying.
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