Request for reviews (M): 7039731: arraycopy could use prefetch on SPARC (original) (raw)

Tom Rodriguez tom.rodriguez at oracle.com
Fri Sep 2 12:00:18 PDT 2011

On Sep 2, 2011, at 11:54 AM, Vladimir Kozlov wrote:

Thank you, Tom

Tom Rodriguez wrote: I think this looks ok. How did you settle on 64 bytes? What do you mean? disjointlongcopycore() already did 64 bytes copy per iteration before these changes. For smaller element's sizes the shifting code is large enough to hide latency from compare and branch so it only copy 16 bytes per iteration.

I'm just wondering whether 64 is big enough. It seems kind of small but maybe there's no benefit to larger sizes.

tom

Thanks, Vladimir

tom On Sep 2, 2011, at 9:57 AM, Vladimir Kozlov wrote: http://cr.openjdk.java.net/~kvn/7039731/webrev

7039731: arraycopy could use prefetch on SPARC Use BIS and prefetch in arraycopy stubs for Sparc (BIS for T4 only). Thanks, Vladimir

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