[lworld] RFR: 8370195: [lworld] Constant-fold _layout_kind loads from constant FlatArrayKlass

[Chen Liang]

On Sun, 19 Oct 2025 17:13:18 GMT, Quan Anh Mai <qamai at openjdk.org> wrote:

> Hi,
> 
> The load to FlatArrayKlass::_layout_kind can be constant-folded if the receiver is a constant. This eliminates all checks when the array type is known statically or speculated correctly.
> 
> Please leave your reviews, thanks a lot.

I wonder if the work to constant fold Unsafe.arrayLayout is similar to this - this is currently a bottleneck in core libraries.

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PR Comment: https://git.openjdk.org/valhalla/pull/1687#issuecomment-3420458613