From: watson1978@...
Date: 2017-03-23T11:08:29+00:00
Subject: [ruby-dev:50036] [Ruby trunk Bug#13357] Improve Time#+ & Time#-	performance

Issue #13357 has been reported by watson1978 (Shizuo Fujita).

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Bug #13357: Improve Time#+ & Time#- performance
https://bugs.ruby-lang.org/issues/13357

* Author: watson1978 (Shizuo Fujita)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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Improve Time#+ & Time#- performance

Time#+ & Time#- will be faster around 15%.
If internal values would have Fixnum,
optimized function improves performance.

### Before
~~~
             user     system      total        real
Time#+   0.820000   0.000000   0.820000 (  0.818081)
Time#-   0.810000   0.000000   0.810000 (  0.813835)
~~~

### After
~~~
             user     system      total        real
Time#+   0.710000   0.000000   0.710000 (  0.710241)
Time#-   0.710000   0.010000   0.720000 (  0.714151)
~~~

### Test code
~~~
require 'benchmark'

Benchmark.bmbm do |x|

  x.report "Time#+" do
    t = Time.now
    2000000.times do
      t + 1
    end
  end

  x.report "Time#-" do
    t = Time.now
    2000000.times do
      t - 1
    end
  end

end
~~~

### Patch
The patch is in https://github.com/ruby/ruby/pull/1547



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