popcnt false data dependency on recent intel

[Vitaly Davidovich]

Hi guys,

Came across this SO thread recently:
http://stackoverflow.com/questions/25078285/replacing-a-32-bit-loop-count-variable-with-64-bit-introduces-crazy-performance

I know hotspot has intrinsic that emits popcnt so thought I'd share in case
similar adjustment needs to be made to hotspot compilers.

Thanks

Sent from my phone
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