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

[Igor Veresov]

Thanks Vladimir and Tom!

On 3/25/11 8:10 PM, Vladimir Kozlov wrote:
> 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
>>