Is i686 the minimum required for HotSpot on x86?

Christian Thalinger christian.thalinger at
Tue Mar 29 08:31:09 PDT 2011

On Mar 29, 2011, at 4:35 PM, Christian Thalinger wrote:
> On Mar 29, 2011, at 4:26 PM, Dr Andrew John Hughes wrote:
>> We've just had a bug report for IcedTea which suggests that
>> HotSpot fails on any x86 platform below i686.
>> The report is:
>> and shows a failure caused by an attempt by the JIT to emit
>> an instruction which isn't present on i586.
>> Does HotSpot require i686 as a minimum? Or is there something
>> else at fault here?
> There is a switch -XX:+Use486InstrsOnly but I have an open bug for that one:
> 6808665: Use486InstrsOnly aborts 32-bit VM

Looking a little closer this could actually be my fault.  I added unguarded cmov instructions to C1 with:

6919934: JSR 292 needs to support x86 C1

And that was delivered in HS18b01.  I will fix that.

-- Christian

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