From: nobu@...
Date: 2017-06-03T12:30:31+00:00
Subject: [ruby-core:81560] [Ruby trunk Bug#13629][Rejected] Improve performance for copying array elements

Issue #13629 has been updated by nobu (Nobuyoshi Nakada).

Status changed from Open to Rejected

Nothing changed actually.

----------------------------------------
Bug #13629: Improve performance for copying array elements
https://bugs.ruby-lang.org/issues/13629#change-65263

* Author: watson1978 (Shizuo Fujita)
* Status: Rejected
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
ary_memcpy0() has calculated the cache line size every time when copy array elements.
This patch will replace it with pre calculated value of cache line size.

Array#+ will be faster around 2%.

### Before
~~~
      Array#+(other)      5.167M (�� 0.1%) i/s -     25.928M in   5.017629s
~~~

### After
~~~
      Array#+(other)      5.256M (�� 0.2%) i/s -     26.410M in   5.025261s
~~~

### Test code
~~~
require 'benchmark/ips'

Benchmark.ips do |x|
  x.report "Array#+(other)" do |loop|
    ary1 = [1, 2, 3]
    ary2 = [4, 5]
    i = 0
    while i < loop
      ary1 + ary2
      i += 1
    end
  end
end
~~~

### Patch
https://github.com/ruby/ruby/pull/1641



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