Integrated: 8325169: Reduce String::indexOf overheads

[Claes Redestad]

On Fri, 2 Feb 2024 13:54:46 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> This patch streamlines and specializes various `String::indexOf` methods. Mainly avoids the need for clamping and doing checks that are redundant in almost all cases, moving the checks to the API boundary where they are needed. 
> 
> This improves performance both at peak and during startup/warmup. Since indexOf is heavily used in bootstrapping code it makes sense to slightly dial back abstraction and delegation, which in this case also brought some benefit to peak performance.
> 
> Testing: tier1-3

This pull request has now been integrated.

Changeset: 19e92201
Author:    Claes Redestad <redestad at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/19e92201b4873954c04cead9a3a456445b3ef289
Stats:     38 lines in 4 files changed: 19 ins; 15 del; 4 mod

8325169: Reduce String::indexOf overheads

Reviewed-by: rriggs, rgiulietti, mli

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PR: https://git.openjdk.org/jdk/pull/17685