RFR (S) 8150102: C1 should fold arraylength for constant/trusted arrays

Aleksey Shipilev aleksey.shipilev at oracle.com
Thu Feb 18 07:55:26 UTC 2016

On 02/18/2016 02:05 AM, Aleksey Shipilev wrote:
> Please review a small tuneup in C1 arraylength folding:
>   https://bugs.openjdk.java.net/browse/JDK-8150102
>   http://cr.openjdk.java.net/~shade/8150102/webrev.00
> After this patch, C1 successfully folds the general arraylength
> accesses. In the end, this lets to fold String.length() for constant
> Strings:
>   http://cr.openjdk.java.net/~shade/8150102/FoldArrayLength.java
> I am actually wondering if as_LoadField path is ever hit in
> applications, because the targeted microbenchmark for static final array
> had improved with new as_Constant path.
> Testing: JPRT -testset hotspot (half of the platforms completed, now
> infra is stalled), microbenchmarks

Passes JPRT -testset hotspot fine.


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