Request for review(M): 6964776: c2 should ensure the polling page is reachable on 64 bit

[Vladimir Kozlov]

Good.

Vladimir

On 3/25/11 7:48 PM, Igor Veresov wrote:
> On 3/25/11 5:31 PM, Vladimir Kozlov wrote:
>> x86_64.ad:
>> + // It does it the polling page is more than disp32 away.
>> ---
>> // It needs it when polling page is more than disp32 away.
>
> Ah, typo, thanks! Actually I meant "it does _if_ the polling page ..." be a continuation of the previous comment line.
>
>>
>> Usually predicate is first in instructions definitions.
>
> All fixed and updated.
>
> igor
>
>>
>> Vladimir
>>
>> Igor Veresov wrote:
>>> C1 and C2 could only use rip-relative addressing when emitting the
>>> page-polling code, which limited the distance from the code cache to
>>> the polling page is more than 2G (doesn't fit in a signed 32bit
>>> displacement). The solution in this case is to materialize the
>>> absolute pointer to the polling page in a register first, as we do on
>>> SPARC.
>>>
>>> Webrev: http://cr.openjdk.java.net/~iveresov/6964776/webrev.00/
>>>
>>> Thanks,
>>> igor
>