RFR(S): 8042997: Make intrinsic some or all check index/range methods

[Paul Sandoz]

> On 9 Nov 2015, at 12:24, Roland Westrelin <roland.westrelin at oracle.com> wrote:
> 
> http://cr.openjdk.java.net/~roland/8042997/webrev.00/
> http://cr.openjdk.java.net/~roland/8042997.jdk/webrev.00/
> 
> This intrinsifies Objects.checkIndex() as a CmpU + RangeCheck node sequence that C2 then optimizes using the existing range check optimizations. The goal is allow library code to have range checks that are guaranteed to be properly optimized.
> 
> I’m not sure if we want to leave the comment on c2 in the library code.
> 

I agree with Aleksey about turning the comment into an @implNote with appropriate substitution of “C2", otherwise JDK code updates look good.


When get’s integrated into jdk9/dev i will update a few places in nio buffers to use the checkIndex method.

Paul.
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