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NEWS: elaborate on JIT for 2.6.0-preview1 [ci skip]

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This information is backported from the draft of 2.6.0-preview1 release
note. NEWS for final 2.6.0 release will be different.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62552 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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k0kubun 2018-02-24 01:05:20 +00:00
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8
NEWS
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@ -98,7 +98,13 @@ with all sufficient information, see the ChangeLog file or Redmine
Ruby 2.5 improves block passing performance. [Feature #14045] Ruby 2.5 improves block passing performance. [Feature #14045]
Additionally, Ruby 2.6 improves the performance of passed block calling. Additionally, Ruby 2.6 improves the performance of passed block calling.
* `--jit` option to enable JIT compiler is added. [Feature #14235] [experimental] * Introduce an initial implementation of JIT (Just-in-time) compiler. [Feature #14235] [experimental]
* `--jit` option is added to enable JIT. `--jit-verbose=1` is good for inspection. See `ruby --help` for others.
* This JIT relies on C compiler used to build Ruby, on runtime. Only gcc and clang are supported for the JIT
for now, and MinGW support has some issues.
* As of 2.6.0-preview1, we're just preparing infrastructure for JIT and very few optimizations are implemented.
So it's not ready for benchmarking Ruby's JIT performance yet. It's known that current JIT enablement makes
Rails application slower for now.
* VM generator script renewal; makes the generated VM more optimized. [GH-1779] * VM generator script renewal; makes the generated VM more optimized. [GH-1779]