Request for review (XS): 7027232: JSR 292: wrong numeric value returned by MH on solaris-sparc

[Vladimir Kozlov]

Yes, thank you Christian

Vladimir

Christian Thalinger wrote:
> On Mar 17, 2011, at 5:56 PM, Vladimir Kozlov wrote:
>> Sorry for arguing about few lines but I think without renaming the code will be better (6 new lines instead of 7):
>>
>> + #ifdef _LP64
>> +           __ ldsw(arg_lsw, O2_scratch);                  // Load LSW
>> + #else
>> +           __ ldsw(arg_lsw, O3_scratch);                  // Load LSW
>> +           __ srlx(O3_scratch, BitsPerInt, O2_scratch));  // Move MSW value to lower 32-bits for STD
>> + #endif
>>            __ st_long(O2_scratch, arg_msw);               // Uses O2/O3 on !_LP64
> 
> Alright.  I changed my code.  Okay to push?
> 
> -- Christian
> 
>> Vladimir
>>
>> On 3/17/11 2:24 AM, Christian Thalinger wrote:
>>> On Mar 15, 2011, at 6:22 PM, Vladimir Kozlov wrote:
>>>> Christian,
>>>>
>>>> We don't support little-endian SPARC, why add a code which will never be executed?
>>> I thought to be on the safe side if anyone ever wants to support it.  Anyway, I removed it and updated the webrev.
>>>
>>> -- Christian
>>>
>>>> On side note (RFE): we should officially drop v8 support (C2 does not support already, only C1). There are already several places where we use stx/ldx without check that it is v9 (yes, we still have an assert which is fine). Also std/ldd is emulated on modern SPARC and so is very slow.
>>>>
>>>> Thanks,
>>>> Vladimir
>>>>
>>>> Christian Thalinger wrote:
>>>>> http://cr.openjdk.java.net/~twisti/7027232/
>>>>> 7027232: JSR 292: wrong numeric value returned by MH on solaris-sparc
>>>>> Reviewed-by:
>>>>> After 7018378 one of the tests of java/dyn/MethodHandlesTest fails on
>>>>> 32-bit SPARC.  st_long uses STD on 32-bit SPARC and the LSW and MSW
>>>>> bits are not moved to the proper registers resulting in a wrong
>>>>> result.
>>>>> The fix is to use the correct registers for 32-bit big-endian and
>>>>> little-endian (just in case) SPARC.
>>>>> src/cpu/sparc/vm/methodHandles_sparc.cpp
> 
>