RFR: 8220159: Optimize various RegMask operations by introducing watermarks
nils.eliasson at oracle.com
Tue Mar 5 15:42:18 UTC 2019
On 2019-03-05 16:54, Claes Redestad wrote:
> by introducing a low and high water mark of the RegMask words that we
> are sure have register bits, we can reduce time spent doing a variety of
> Bug: https://bugs.openjdk.java.net/browse/JDK-8220159
> Webrev: http://cr.openjdk.java.net/~redestad/8220159/open.00/
> On a few profiled startup application the average number of instructions
> spent compiling methods in C2 drops 10-15%, and we see improvements on a
> range of startup and footprint applications.
> There are also a few improvements on microbenchmarks, likely due to a
> positive effect on warmup times.
> Testing: tier1-3
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