RFR: 8306706: Support out-of-line code generation for MachNodes [v4]

[Tobias Hartmann]

On Thu, 18 May 2023 14:15:22 GMT, Quan Anh Mai <qamai at openjdk.org> wrote:

>> Hi,
>> 
>> This patch adds supports for MachNodes to emit an out-of-line piece of code in the stub section of the compiled method. This allows the separation of the uncommon path from the common one, which speeds up the common path a little bit and increases compiled code density. Please take a look and leave reviews.
>> 
>> Thanks a lot.
>
> Quan Anh Mai has updated the pull request incrementally with one additional commit since the last revision:
> 
>   whitespace

Nice! The new version looks good to me.

src/hotspot/share/opto/c2_CodeStubs.hpp line 116:

> 114: 
> 115: template <class... Ts>
> 116: class C2GeneralStub : public C2CodeStub {

A comment describing the purpose of this class would be good.

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Marked as reviewed by thartmann (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13602#pullrequestreview-1439128798
PR Review Comment: https://git.openjdk.org/jdk/pull/13602#discussion_r1201897039