RFR(S): 8135069: C2 replaces range checks by unsigned comparison with -1

[Roland Westrelin]

Thanks for the review, Vladimir.

Roland.

> On Sep 14, 2015, at 6:06 PM, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:
> 
> Looks fine.
> 
> Thanks,
> Vladimir
> 
> On 9/14/15 5:28 AM, Roland Westrelin wrote:
>> http://cr.openjdk.java.net/~roland/8135069/webrev.00/
>> 
>> Another corner case that’s not handled correctly by the code that folds 2 consecutive integer comparisons into a single unsigned comparison:
>> 
>> i < 0 || i > -1 is folded as i >u -1. It should be i >=u 0. I refactored the code so it’s easier to relate the comments and the logic.
>> 
>> Roland.
>>