[OpenJDK 2D-Dev] [9] Review Request: 8140266 Performance loss between jdk8 and jdk9 on Maskfill

Erik Joelsson erik.joelsson at oracle.com
Sat Dec 24 11:21:42 UTC 2016

Build change looks ok, but I too think a comment explaining why is a 
good idea.


On 2016-12-23 15:49, Philip Race wrote:
> Looks OK to me although it is a very cryptic option so maybe include a 
> comment
> that it is for performance with some versions of gcc ...
> -phil.
> On 12/23/16, 3:15 AM, Sergey Bylokhov wrote:
>> Hello.
>> Please review the small fix for jdk9.
>> The change add an additional gcc option to the libawt lib to improve 
>> some graphics operations: 20%.
>> This option is a part of -03.
>>> |-fgcse-after-reload|
>>>     When -fgcse-after-reload is enabled, a redundant load elimination
>>>     pass is performed after reload. The purpose of this pass is to
>>>     clean up redundant spilling. 
>> https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
>> Note that if -03 will be enabled directly via OPTIMIZATION flag then 
>> the performance will not be improved.
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8140266
>> Webrev can be found at: 
>> http://cr.openjdk.java.net/~serb/8140266/webrev.00

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