Feature #8576: Add optimized method type for constant value methods

• Status: Assigned
• Assignee: ko1 (Koichi Sasada)
• Target version: -

I've written a patch adding a new method type (VM_METHOD_TYPE_CONSTVAL) for methods that only return a constant value. The patch significantly improves the performance of calls to these types of methods.

I've written a small benchmark script:

require "benchmark"

def foo
  1234
end

puts Benchmark.measure {
  1_000_000.times do
    foo; foo; foo; foo; foo
    foo; foo; foo; foo; foo
  end
}

Before patch:

$ ./rb x.rb
  0.620000   0.000000   0.620000 (  0.625130)

After patch:

$ ./rb x.rb
  0.300000   0.000000   0.300000 (  0.296528)

The patch is here: https://github.com/charliesome/ruby/compare/constant-value-methods

• Assignee set to ko1 (Koichi Sasada)

Feedback would be appreciated!

• Tracker changed from Bug to Feature

[ko1 (Koichi Sasada)]

Memo - Discussion on twitter:
https://twitter.com/charliesome/status/350901225010638850

[ko1 (Koichi Sasada)]

• Category set to core
• Target version set to 2.1.0

[ko1 (Koichi Sasada)]

• Target version changed from 2.1.0 to 2.6

[ko1 (Koichi Sasada)]

Actually, I tried this approach, but I couldn't find good improvement. I'll try it again.

[shyouhei (Shyouhei Urabe)]

• Status changed from Open to Assigned

[naruse (Yui NARUSE)]

• Target version deleted (2.6)