Is i686 the minimum required for HotSpot on x86?

[Christian Thalinger]

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:
>> 
>> http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=682
>> 
>> 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

http://hg.openjdk.java.net/jdk7/hotspot-comp/hotspot/rev/3cf667df43ef

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

-- Christian