Request for reviews (S): 7054211: No loop unrolling done in jdk7b144 for a test update() while loop (original) (raw)

Vladimir Kozlov vladimir.kozlov at oracle.com
Wed Sep 7 09:37:33 PDT 2011

Thank you, Tom

I will update comments.

Vladimir

Tom Rodriguez wrote:

Though it might be nice to correct the comment to say that it helps crc32 and not CaffeineMark.

tom On Sep 7, 2011, at 9:29 AM, Vladimir Kozlov wrote:

http://cr.openjdk.java.net/~kvn/7054211/webrev

7054211: No loop unrolling done in jdk7b144 for a test update() while loop It is anti-delta of changes which removed code for CaffeineMark. A perf regression of approximately 13.5% was observed in benchmark with a pure java crc32 implementation which use XORs after that changes. Our refworkload benchmarks are not affected by this fix (and that is why did original changes). Thanks, Vladimir

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