Request for review(M): 6964776: c2 should ensure the polling page is reachable on 64 bit
vladimir.kozlov at oracle.com
Fri Mar 25 20:10:32 PDT 2011
On 3/25/11 7:48 PM, Igor Veresov wrote:
> On 3/25/11 5:31 PM, Vladimir Kozlov wrote:
>> + // 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 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
>>> Webrev: http://cr.openjdk.java.net/~iveresov/6964776/webrev.00/
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