RFR: 8210416: [linux] Poor StrictMath performance due to non-optimized compilation

Erik Joelsson erik.joelsson at oracle.com
Mon Sep 10 16:35:09 UTC 2018

I've filed JDK-8210551.


On 2018-09-10 09:29, Erik Joelsson wrote:
> I see. I was not aware of that issue, but we clearly need to file a 
> bug for it and fix it. In this case I think it's fine to us the macro 
> however.
> /Erik
> On 2018-09-10 03:29, Severin Gehwolf wrote:
>> Hi Erik,
>> On Fri, 2018-09-07 at 10:19 -0700, Erik Joelsson wrote:
>>> Instead of checking for compiler version, you could simply use the
>>> FLAGS_COMPILER_CHECK_ARGUMENTS macro. This would apply to both gcc and
>>> clang. We usually prefer this over version checks (unless a version is
>>> just known to be unstable with a certain flag, in which case a
>>> capability check will not work).
>> I see. Note JDK-8157358, though, which seems to have changed[1] the
>> build system to not use FLAGS_COMPILER_CHECK_ARGUMENTS as it seems to
>> break cross-compilation. It's not used at the moment. Do you still want
>> me to use it?
>>> CoreLibrarkes.gmk:
>>> 43: I think "with" is superfluous
>> Thanks, fixed locally.
>>> Otherwise I think this looks like the right direction.
>> Glad to hear that.
>> Thanks,
>> Severin
>> [1] http://hg.openjdk.java.net/jdk9/jdk9/rev/f51004322fbe

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