[ruby-core:75640] [Ruby trunk Feature#12403] Optimise Regexp#match?

Issue #12403 has been updated by Nobuyoshi Nakada.


https://github.com/ruby/ruby/compare/trunk...nobu:feature/12403-optimize-Regexp%23match_p

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benchmark results:
Execution time (sec)

name                        |normal |opt
----------------------------|------:|------:
regexp_match_p_match_empty  |  0.141|  0.111
regexp_match_p_match_long   |  3.941|  3.864
regexp_match_p_match_short  |  0.138|  0.099
regexp_match_p_unmatch_long |  3.848|  3.837
regexp_match_p_unmatch_short|  0.103|  0.079

Speedup ratio: compare with the result of `normal' (greater is better)

name                        |opt
----------------------------|------:
regexp_match_p_match_empty  |  1.266
regexp_match_p_match_long   |  1.020
regexp_match_p_match_short  |  1.388
regexp_match_p_unmatch_long |  1.003
regexp_match_p_unmatch_short|  1.306


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Feature #12403: Optimise Regexp#match?
https://bugs.ruby-lang.org/issues/12403#change-58771

* Author: Sam Saffron
* Status: Open
* Priority: Normal
* Assignee: 
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At the moment `#match?` is dynamically dispatched and args are walked. 

Instead

- Add 2 insns instructions for #match? with 1 param and #match? with 2 params
- Amend parser to route #match?("s") and #match?("s", 1) to insns version

Main reason for `#match?` is performance, might as well make it as fast as possible. 



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