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Issue #13750 has been updated by the_spectator (Akshay Birajdar).
@koic Made a new attempt with patch https://github.com/ruby/ruby/pull/2941
----------------------------------------
Feature #13750: Improve String#casecmp? and Symbol#casecmp? performance wit=
h ASCII string
https://bugs.ruby-lang.org/issues/13750#change-86015
* Author: watson1978 (Shizuo Fujita)
* Status: Open
* Priority: Normal
----------------------------------------
I think String#casecmp and String#casecmp? are similar methods.
But they have different performance on ASCII string.
Seems that String#casecmp handles ASCII string only,
however it is faster than String#casecmp?.
This patch will use the code of String#casecmp with ASCII string on String#=
casecmp?.
But, this patch will introduce a few penalties for UTF8 string in where det=
ect ASCII/UTF8 string.
~~~
String#casecmp? ASCII -> 61.3 % up
String#casecmp? UTF8 -> 1.3 % down
Symbol#casecmp? ASCII -> 80.0 % up
Symbol#casecmp? UTF8 -> 4.0 % down
~~~
### Before
~~~
Calculating -------------------------------------
String#casecmp 5.961M (=B1 3.8%) i/s - 29.838M in 5.017907s
String#casecmp? ASCII
3.530M (=B1 8.6%) i/s - 17.554M in 5.034848s
String#casecmp? UTF8 1.252M (=B1 7.4%) i/s - 6.213M in 5.012168s
Symbol#casecmp 8.555M (=B1 2.4%) i/s - 42.822M in 5.009280s
Symbol#casecmp? ASCII
4.235M (=B1 9.7%) i/s - 20.824M in 5.001368s
Symbol#casecmp? UTF8 1.329M (=B1 0.1%) i/s - 6.704M in 5.043725s
~~~
### After
~~~
Calculating -------------------------------------
String#casecmp 5.984M (=B1 6.4%) i/s - 29.829M in 5.020331s
String#casecmp? ASCII
5.658M (=B1 1.5%) i/s - 28.308M in 5.004547s
String#casecmp? UTF8 1.215M (=B1 4.3%) i/s - 6.132M in 5.060292s
Symbol#casecmp 8.651M (=B1 0.9%) i/s - 43.313M in 5.007215s
Symbol#casecmp? ASCII
7.462M (=B1 0.5%) i/s - 37.489M in 5.023892s
Symbol#casecmp? UTF8 1.275M (=B1 0.2%) i/s - 6.444M in 5.052743s
~~~
### Test code
~~~ruby
require 'benchmark/ips'
Benchmark.ips do |x|
x.report "String#casecmp" do |loop|
loop.times { "aBcDeF".casecmp("abcdefg") }
end
x.report "String#casecmp? ASCII" do |loop|
loop.times { "aBcDeF".casecmp?("abcdefg") }
end
x.report "String#casecmp? UTF8" do |loop|
loop.times { "\u{e4 f6 fc}".casecmp?("\u{c4 d6 dc}") }
end
x.report "Symbol#casecmp" do |loop|
loop.times { :aBcDeF.casecmp(:abcdefg) }
end
x.report "Symbol#casecmp? ASCII" do |loop|
loop.times { :aBcDeF.casecmp?(:abcdefg) }
end
x.report "Symbol#casecmp? UTF8" do |loop|
loop.times { :"\u{e4 f6 fc}".casecmp?(:"\u{c4 d6 dc}") }
end
end
~~~
### Patch
https://github.com/ruby/ruby/pull/1668
-- =
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