AArch64: temporary fix for trig and log functions in jdk11u

[Rob McKenna]

Hi Andrew,

Would you mind generating a webrev and posting to cr.openjdk.java.net or
attaching the patches to email? (or the bug!) Thanks,

    -Rob

On 25/09/18 10:10, Andrew Dinn wrote:
> Oops. Apologies. Those were internal links!
> 
> Corrections inline.
> 
> On 25/09/18 09:49, Andrew Dinn wrote:
> > Hi Rob,
> > 
> > There are two critical AArch64 bugs in progress in jdk/jdk which are
> > also present in jdk11u (JDK-8210858 and JDK-8210461). The generated
> > machine code for maths intrinsics has been shown to contain bugs.
> > 
> > The first bug has been fixed in jdk12 and we are pretty confident that
> > the code has now been properly tested and is correct. the second has a
> > proposed patch which is still being reviewed.
> > 
> > We resolved this issue in the jdk11u-aarch64 releases built from our
> > downstream repo with the following patches:
> 
> 
> https://src.fedoraproject.org/rpms/java-11-openjdk/blob/master/f/RHBZ-1628612-JDK-8210461-workaround-disable-aarch64-intrinsic.patch
> 
> 
> https://src.fedoraproject.org/rpms/java-11-openjdk/blob/master/f/RHBZ-1630996-JDK-8210858-workaround-disable-aarch64-intrinsic-log.patch
> 
> > i.e. we disabled publishing of the generated assembler intrinsics.
> > 
> > Rather than wait for a backport of the upstream fixes would it be
> > possible to apply this patch to jdk11u now? That would allow other Linux
> > distros to cherry-pick this patch for their own jdk11u releases. This is
> > quite urgent as we want to be sure those distros get a chance to push an
> > updated release before the next official jdk11u version is ready.
> > 
> > I am not sure where this request sits as regards the current guidelines
> > [1] for approving fixes nor what would be needed by way of JIRA to to
> > cover this patch so your advice as to how we can proceed here would be
> > very welcome.
> > 
> > [1 http://openjdk.java.net/projects/jdk-updates/approval.html
> 
> regards,
> 
> 
> Andrew Dinn
> -----------
> Senior Principal Software Engineer
> Red Hat UK Ltd
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