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Add NEWS entries about JIT optimizations

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and a related VM improvement.

JIT related commits:

* Code size reduction
  * Deduplicate functions on JIT compaction 818d6d33368a396d9cd3d1a34a84015a9e76c5c8
  * Avoid always inlining cold paths of ivar fcd257629063a345c48ff2d8057fa8ab910881f2
  * Inline only fast path of rb_class_of b16a2aa938d091c387a7437d94dac7f7bb829ba2
  * Eliminate a call instruction on deopt 61b14bb32b7e62760225cb2207df5fe87e5339ab
* Cold path partitioning
  * Mark method call slow paths as COLDFUNC 0e5a58b6bf6aae72b6290a8d68e0a1b6d9eb4f79
  * Mark vm_stackoverflow as NOINLINE COLDFUNC 9d71373c237876038cbac63bb0132907a78288a2
  * Create mjit_exec_slowpath and mark it as NOINLINE COLDFUNC 083a17a82ad4c1f80cfb9e84cfb1bff5586470b1
* Primitive.attr! 'inline' / Integer#zero? 7561db8c009bb79a75024fa4ed0350bfb3d0626c
  * Kernel#class 946e5cc668f66a4a0b79461047d3fcba8b71eef0
  * (more to come...)
* Properly generate opt_send for cfunc cc 7982dc1dfd5df000b7361ccb7bc820da4f3547b8
* Optimize exivar access b736ea63bd4ce4e2fc81dfa73938b39fa70f659c
* Make JIT-ed leave leaf 151f8be40d385ada2ebf7feb84210ed7db7ef4df
* Inline vm_call_cfunc b9d3ceee8f8e4fade1eddc0c18abee59f9c1eee7

VM:

* Enable fastpath on invokesuper 5c2768181382bf84137759efea66f3aaf212665d
  * History: https://speakerdeck.com/k0kubun/ruby-3-samituto?slide=40 (in Japanese)
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Takashi Kokubun 2020-06-26 00:54:05 -07:00
parent 4949df498a
commit 200c5f4075
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@ -235,6 +235,28 @@ Excluding feature bug fixes.
a keyword splat to a method that accepts specific keywords
does not allocate a hash.
* `super` is optimized when the same type of method is called in the previous call,
when it's not refinements or an attr reader or writer.
### JIT
* Native functions shared by multiple methods are deduplicated on JIT compaction.
* Decrease code size of hot paths by some optimizations and partitioning cold paths.
* Not only pure Ruby methods but also some C methods skip pushing a method frame.
* `Kernel#class`, `Integer#zero?`
* Always generate appropriate code for `==`, `nil?`, and `!` calls depending on
a receiver class.
* Optimize instance variable access in some core classes like Hash and their subclasses
* Eliminate VM register access on a method return
* Optimize C method call a little
## Miscellaneous changes
* Methods using `ruby2_keywords` will no longer keep empty keyword