RFR: 8220502: Inefficient pre-sizing of PhiResolverState arrays in c1_LIRGenerator

Tobias Hartmann tobias.hartmann at oracle.com
Wed Mar 13 14:00:35 UTC 2019

Hi Claes,

very nice, reviewed.

Best regards,

On 13.03.19 12:03, Claes Redestad wrote:
> Hi,
> the PhiResolverState arrays are pre-sized to the maximum possible number
> of nodes that can be put into them, which when instrumenting turns out
> to be quite excessive. By not pre-sizing to the theoretical maximum I
> can measure a substantial improvements in calling methods.
> Webrev: http://cr.openjdk.java.net/~redestad/8220502/open.00/
> Bug:    https://bugs.openjdk.java.net/browse/JDK-8220502
> Testing: tier1-3
> On a set of startup and footprint benchmarks, 60% of collected metrics
> show 0.2-2% statistically significant improvements, with no
> regression on any metric.
> Thanks!
> /Claes

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