Removing -XX option Use486InstrsOnly from hotspot.

David Holmes david.holmes at
Tue Dec 1 06:38:45 UTC 2015

Hi Jamsheed,

On 1/12/2015 1:47 PM, Jamsheed C m wrote:
> Hi All,
> I am planning to remove command line option -XX:+/-Use486InstrsOnly from
> Hotspot.
> This flag is too old to be maintained in Hotspot any longer. Let me know
> if someone is still using this flag?

This flag is completely obsolete. It's only use is in determining cpu 
information inside VM_Version::get_processor_features; and as per the 
bug report enabling it on a fastdebug build fails an assertion - so you 
can be assured we are not using this in any testing. And of course 486 
has not been supported for a long time. :)

But thanks for checking.


> (flag removal decision is triggered by the bug 6808665)
> Best Regards,
> Jamsheed

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