On Mon, 29 Apr 2024 12:14:17 GMT, Claes Redestad <redes...@openjdk.org> wrote:
>> I'm looking at ways at reducing/eliminating startup overheads the classfile
>> API in preparation of #17108, and have pushed a series of enhancements to
>> that effect already. This PR is a collection of minor improvements which add
>> up to a 1.5% reduction in retired instructions - or a 5% reduction in
>> executed bytecode - on a simple lambda startup test.
>
> Claes Redestad has updated the pull request incrementally with one additional
> commit since the last revision:
>
> Descriptors can't be empty, optimize isArray and isClassOrInterface with
> descriptorString().charAt(0) ==
src/java.base/share/classes/java/lang/constant/MethodTypeDescImpl.java line 74:
> 72:
> 73: for (ClassDesc cd : trustedArgTypes)
> 74: if (cd.descriptorString().equals("V")) // implicit null check
Just curious, is `equals` faster than `charAt(0) ==` for single-char strings?
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PR Review Comment: https://git.openjdk.org/jdk/pull/18991#discussion_r1582998433
