RFR(XS): 8149973: Optimize object alignment check in debug builds.

[David Holmes]

Hi Dmitry,

On 24/02/2016 8:42 PM, Dmitry Dmitriev wrote:
> Hello,
>
> Please, review small optimization to the object alignment check in the
> debug builds. In this fix I replace division by MinObjAlignmentInBytes
> to bitwise AND operation with MinObjAlignmentInBytesMask, because
> MinObjAlignmentInBytes is a power of two. Suggested construction already
> used in MacroAssembler, e.g.
> hotspot/src/cpu/x86/vm/c1_MacroAssembler_x86.cpp).
>
> JBS: https://bugs.openjdk.java.net/browse/JDK-8149973
> webrev.00: http://cr.openjdk.java.net/~ddmitriev/8149973/webrev.00/
> <http://cr.openjdk.java.net/%7Eddmitriev/8149973/webrev.00/>
> Testing: jprt, hotspot_all

Seems functionally correct - and as you say mirrors existing code.

Cheers,
David

> Thanks,
> Dmitry