Ruby

"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