RFR(S) 8075093: Enable UseFPUForSpilling support on SPARC

[Dean Long]

OK, thanks!

dl

On 9/2/2015 4:26 PM, Shrinivas Joshi wrote:
> Hi Dean,
>
> Thanks for the review.
>
> I only tried it on a micro-benchmark where a local variable in a tight 
> loop was getting spilled to/filled from the stack. I noticed about 85% 
> reduction in execution time.
>
> -Shrinivas
>
> On 9/2/2015 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.
>>
>>
>>
>