[aarch64-port-dev ] RFR: AARCH64: RewriteFrequentPairs optimization

[Edward Nevill]

On Tue, 2015-05-26 at 14:33 +0000, Alexeev, Alexander wrote:

> 
> Could somebody review the patch [1] and sponsor if approved?

Hi Alexander,

Thanks for this.

I will sponsor this patch. I have created a JIRA issue.

https://bugs.openjdk.java.net/browse/JDK-8081289

> Patch implements RewriteFrequentPairs optimization for aarch64.

I will prepare a changeset and submit it for review.

> It was tested with hotspot's jtreg test suite and DaCapo benchmark avrora executed in interpretation mode.
> 
> 
> Hotspot tests:
> 
> Before:
> 
> Test results: passed: 801; failed: 47; error: 1
> 
> After
> 
> Test results: passed: 801; failed: 47; error: 1
> 
> 
> Dacapo:
> 
> $java -Xint -XX:+RewriteFrequentPairs -jar dacapo-9.12-bach.jar avrora

RewriteFrequentPairs should be the default. I will make it the default in the changeset for review.

Did you notice any performance difference on decapo or any other benchmarks either with or without -Xint?

When you ran the hotspot tests did you run them with -vmoption:-XX:+RewriteFrequentPairs in addition to -vmoption:-Xint ?

All the best,
Ed.