RFR(S) 8075093: Enable UseFPUForSpilling support on SPARC

[Vladimir Kozlov]

Thank you, Dean.

 From bug report:

"Preliminary measurements using a micro-benchmark on SPARC T7-1 system 
show 85% reduction in execution time with UseFPUForSpilling enabled."

Thanks,
Vladimir

On 9/2/15 4:18 PM, Dean Long wrote:
> Looks fine.  Was there any measurable performance improvement?
>
> dl
>
> On 9/2/2015 12:51 PM, Vladimir Kozlov wrote:
>> https://bugs.openjdk.java.net/browse/JDK-8075093
>> http://cr.openjdk.java.net/~kvn/8075093/webrev
>>
>> SPARC S3 core and beyond have single-cycle MOV instructions (MOVdTOx,
>> MOVxTOd) for FP-to-GP and GP-to-FP register moves. These when used
>> under UseFPUForSpilling can help improve performance.
>>
>> Contributed-by: Shrinivas Joshi
>>
>> I reviewed changes.
>