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Added YJIT entries from draft of release announcement

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Hiroshi SHIBATA 2024-12-17 12:32:21 +09:00
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NEWS.md
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@ -360,13 +360,13 @@ details of the default gems or bundled gems.
* The default parser is now Prism.
To use the conventional parser, use the command-line argument `--parser=parse.y`.
[[Feature #20564]]
* Happy Eyeballs version 2 (RFC8305), an algorithm that ensures faster and more reliable connections
by attempting IPv6 and IPv4 concurrently, is used in Socket.tcp and TCPSocket.new.
To disable it globally, set the environment variable `RUBY_TCP_NO_FAST_FALLBACK=1` or
call `Socket.tcp_fast_fallback=false`.
Or to disable it on a per-method basis, use the keyword argument `fast_fallback: false`.
[[Feature #20108]] [[Feature #20782]]
* Array#each is rewritten in Ruby for better performance [[Feature #20182]].
* Alternative garbage collector (GC) implementations can be loaded dynamically
through the modular garbage collector feature. To enable this feature,
@ -385,7 +385,30 @@ details of the default gems or bundled gems.
enabled using the environment variable `RUBY_GC_LIBRARY=mmtk`. This requires
the Rust toolchain on the build machine. [[Feature #20860]]
## JIT
* New features of YJIT
* Add unified memory limit via `--yjit-mem-size` command-line option (default 128MiB)
which tracks total YJIT memory usage and is more intuitive than the
old `--yjit-exec-mem-size`.
* More statistics now always available via `RubyVM::YJIT.runtime_stats`
* Add compilation log to track what gets compiled via `--yjit-log`
* Tail of the log also available at run-time via `RubyVM::YJIT.log`
* Add support for shareable consts in multi-ractor mode
* Can now trace counted exits with `--yjit-trace-exits=COUNTER`
* Compressed context reduces memory needed to store YJIT metadata
* New optimizations of YJIT
* Improved allocator with ability to allocate registers for local variables
* When YJIT is enabled, use more Core primitives written in Ruby:
* `Array#each`, `Array#select`, `Array#map` rewritten in Ruby for better performance [[Feature #20182]].
* Ability to inline small/trivial methods such as:
* Empty methods
* Methods returning a constant
* Methods returning `self`
* Methods directly returning an argument
* Specialized codegen for many more runtime methods
* Optimize `String#getbyte`, `String#setbyte` and other string methods
* Optimize bitwise operations to speed up low-level bit/byte manipulation
* Various other incremental optimizations
## Miscellaneous changes