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Feature #13482

Updated by watson1978 (Shizuo Fujita) over 2 years ago

"set instance variable" will be faster around 14%.

## macOS 10.12 + clang-802.0.41
### Before
~~~
user system total real
1.550000 0.000000 1.550000 ( 1.555161)
~~~

### After
~~~
user system total real
1.400000 0.000000 1.400000 ( 1.398825)
~~~

## macOS 10.12 + gcc 6.3.0_1
### Before
~~~
user system total real
1.660000 0.000000 1.660000 ( 1.659721)
~~~

### After
~~~
user system total real
1.450000 0.000000 1.450000 ( 1.454589)
~~~

## Ubuntu 16.04 + gcc 5.4.0
### Before
~~~
user system total real
0.890000 0.000000 0.890000 ( 0.891217)
~~~

### After
~~~
user system total real
0.790000 0.000000 0.790000 ( 0.783157)
~~~

## Test code
~~~
require 'benchmark'

Benchmark.bmbm do |x|
x.report do
i = 0
while (i < 50000000)
@obj = 42
i+=1
end
end

end
~~~

## Patch

https://github.com/ruby/ruby/pull/1590

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