From: "charliesome (Charlie Somerville)" <charliesome@...>
Date: 2013-06-29T00:09:04+09:00
Subject: [ruby-core:55688] [ruby-trunk - Bug #8576] Add optimized method type for constant value methods


Issue #8576 has been updated by charliesome (Charlie Somerville).

Assignee set to ko1 (Koichi Sasada)

Feedback would be appreciated!
----------------------------------------
Bug #8576: Add optimized method type for constant value methods
https://bugs.ruby-lang.org/issues/8576#change-40189

Author: charliesome (Charlie Somerville)
Status: Open
Priority: Normal
Assignee: ko1 (Koichi Sasada)
Category: 
Target version: 
ruby -v: ruby 2.1.0dev (2013-06-28 trunk 41688) [x86_64-darwin11.4.0]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


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


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