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Merge a YJIT release notes draft into NEWS [ci skip]

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Takashi Kokubun 2023-05-04 15:58:49 -07:00
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NEWS.md
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@ -90,14 +90,22 @@ changelog for details of the default gems or bundled gems.
### YJIT
* Significant performance improvements over 3.2
* Splat and rest arguments support has been improved.
* Registers are allocated for stack operations of the virtual machine.
* More calls with optional arguments are compiled.
* `Integer#!=`, `String#!=`, `Kernel#block_given?`, `Kernel#is_a?`,
`Kernel#instance_of?`, `Module#===` are specially optimized.
* Instance variables no longer exit to the interpreter
with megamorphic Object Shapes.
* Metadata for compiled code uses a lot less memory.
* Splat and rest arguments support has been improved.
* Registers are allocated for stack operations of the virtual machine.
* More calls with optional arguments are compiled.
* `Integer#!=`, `String#!=`, `Kernel#block_given?`, `Kernel#is_a?`,
`Kernel#instance_of?`, `Module#===` are specially optimized.
* Instance variables no longer exit to the interpreter
with megamorphic Object Shapes.
* Improved code generation on ARM64
* Option to start YJIT in paused mode and then later enable it manually
* `--yjit-pause` and `RubyVM::YJIT.resume`
* This can be used to enable YJIT only once your application is done booting
* Exit tracing option now supports sampling
* `--trace-exits-sample-rate=N`
* Multiple bug fixes
[Feature #18498]: https://bugs.ruby-lang.org/issues/18498
[Bug #19150]: https://bugs.ruby-lang.org/issues/19150