RFR(XS): 8141624: Limit calculation of pre loop during super word optimization is wrong

[Vladimir Ivanov]

Looks good to me.

Best regards,
Vladimir Ivanov

On 11/6/15 4:53 PM, Volker Simonis wrote:
> Hi,
>
> can I please have a second review and a sponsor for this fix
> contributed by gunter.haug at sap.com:
>
> http://cr.openjdk.java.net/~simonis/webrevs/2015/8141624/
> https://bugs.openjdk.java.net/browse/JDK-8141624
>
> The variable "MemNode* best_align_to_mem_ref" is hidden by a second
> declaration of a variable with the same name in an inner block of the
> function "SuperWord::find_adjacent_refs()". This leads to unaligned
> accesses in generated code. While many platforms handle these
> correctly (slower, though), Itanium and potentially other platforms
> which don't allow unaligned access will crash.
>
> Thank you and best regards,
> Volker
>