mostly for https://github.com/jruby/jruby/pull/4736

benchmark.rb

require 'benchmark'

TIMES = (ENV['TIMES'] || 200_000_000).to_i

AS = ENV['AS'] == 'true'

require 'active_support/all' if AS
require 'active_support/core_ext' if AS

if ENV['REOPEN'] == 'true'
  class Fixnum
    def foo; 1+0 end
  end
  class Float
    def bar; 1.0 end
  end
end

Benchmark.bmbm do |x|

  a = 1; b = 2
  x.report("(1 + 12) + (99 * 2) [#{TIMES}x]") do
    TIMES.times do
      (a + 12) + (99 * b)
    end
  end

  n = 2
  x.report("2 + 1 [#{TIMES}x]") do
    TIMES.times { n + 1 }
  end

  ni = 120
  x.report("120 / 4 [#{TIMES}x]") do
    TIMES.times { ni / 4 }
  end

  nf = 120.0
  x.report("120.0 / 4.0 [#{TIMES}x]") do
    TIMES.times { nf / 4.0 }
  end

end

result_base-indy=false.txt

$ AS=true REOPEN=true JRUBY_OPTS="-Xcompile.invokedynamic=false" jruby benchmark.rb
Rehearsal --------------------------------------------------------------------
(1 + 12) + (99 * 2) [200000000x]   8.070000   0.000000   8.070000 (  7.896033)
2 + 1 [200000000x]                 5.260000   0.000000   5.260000 (  5.111049)
120 / 4 [200000000x]               6.690000   0.010000   6.700000 (  6.637188)
120.0 / 4.0 [200000000x]           6.320000   0.190000   6.510000 (  6.180048)
---------------------------------------------------------- total: 26.540000sec

                                       user     system      total        real
(1 + 12) + (99 * 2) [200000000x]   7.880000   0.000000   7.880000 (  7.877193)
2 + 1 [200000000x]                 4.850000   0.000000   4.850000 (  4.843902)
120 / 4 [200000000x]               6.480000   0.000000   6.480000 (  6.474418)
120.0 / 4.0 [200000000x]           5.870000   0.050000   5.920000 (  5.847652)

result_base-indy=true.txt

$ AS=true REOPEN=true JRUBY_OPTS="-Xcompile.invokedynamic=true" jruby benchmark.rb
Rehearsal --------------------------------------------------------------------
(1 + 12) + (99 * 2) [200000000x]   7.140000   0.000000   7.140000 (  6.366402)
2 + 1 [200000000x]                 4.520000   0.000000   4.520000 (  4.358943)
120 / 4 [200000000x]               6.470000   0.000000   6.470000 (  6.432327)
120.0 / 4.0 [200000000x]           4.720000   0.150000   4.870000 (  4.583619)
---------------------------------------------------------- total: 23.000000sec

                                       user     system      total        real
(1 + 12) + (99 * 2) [200000000x]   5.760000   0.000000   5.760000 (  5.739212)
2 + 1 [200000000x]                 4.270000   0.000000   4.270000 (  4.267017)
120 / 4 [200000000x]               6.410000   0.000000   6.410000 (  6.387627)
120.0 / 4.0 [200000000x]           4.540000   0.050000   4.590000 (  4.491516)

result_patch-indy=false.txt

$ AS=true REOPEN=true JRUBY_OPTS="-Xcompile.invokedynamic=false" bin/jruby benchmark.rb 
Rehearsal --------------------------------------------------------------------
(1 + 12) + (99 * 2) [200000000x]   6.790000   0.000000   6.790000 (  6.547216)
2 + 1 [200000000x]                 3.520000   0.000000   3.520000 (  3.469472)
120 / 4 [200000000x]               3.680000   0.000000   3.680000 (  3.651878)
120.0 / 4.0 [200000000x]           4.860000   0.130000   4.990000 (  4.568167)
---------------------------------------------------------- total: 18.980000sec

                                       user     system      total        real
(1 + 12) + (99 * 2) [200000000x]   6.880000   0.000000   6.880000 (  6.880773)    12.6% better*
2 + 1 [200000000x]                 3.550000   0.000000   3.550000 (  3.551130)    26.7% better*
120 / 4 [200000000x]               3.650000   0.000000   3.650000 (  3.643466)    43.7% better*
120.0 / 4.0 [200000000x]           4.030000   0.020000   4.050000 (  3.983929)    31.8% better*

* compared to *result_base-indy=false.txt*

result_patch-indy=true.txt

$ AS=true REOPEN=true JRUBY_OPTS="-Xcompile.invokedynamic=true" bin/jruby benchmark.rb 
Rehearsal --------------------------------------------------------------------
(1 + 12) + (99 * 2) [200000000x]   4.800000   0.010000   4.810000 (  4.457754)
2 + 1 [200000000x]                 3.650000   0.000000   3.650000 (  3.527968)
120 / 4 [200000000x]               3.500000   0.000000   3.500000 (  3.445908)
120.0 / 4.0 [200000000x]           4.150000   0.170000   4.320000 (  4.014289)
---------------------------------------------------------- total: 16.280000sec

                                       user     system      total        real
(1 + 12) + (99 * 2) [200000000x]   4.340000   0.010000   4.350000 (  4.342414)    24.3% better*
2 + 1 [200000000x]                 3.670000   0.000000   3.670000 (  3.669858)    14.0% better*
120 / 4 [200000000x]               3.680000   0.000000   3.680000 (  3.676402)    42.4% better*
120.0 / 4.0 [200000000x]           3.950000   0.020000   3.970000 (  3.910669)    12.9% better*

* compared to *result_base-indy=true.txt*