Add new benchmark for getivar with T_CLASS and T_MODULE (#449)

Author: tekknolagi

benchmarks.yml

@@ -170,6 +170,11 @@ getivar:
   category: micro
   single_file: true
   ractor: true
+getivar-module:
+  desc: getivar tests the performance of getting instance variable values from modules.
+  category: micro
+  single_file: true
+  ractor: true
 structaref:
   desc: structaref tests the performance of getting Struct members
   category: micro

benchmarks/getivar-module.rb

@@ -0,0 +1,66 @@
+require_relative '../harness/loader'
+
+class TheClass
+  @v0 = 1
+  @v1 = 2
+  @v2 = 3
+  @levar = 1
+
+  def self.get_value_loop
+    sum = 0
+
+    # 1M
+    i = 0
+    while i < 1000000
+      # 10 times to de-emphasize loop overhead
+      sum += @levar
+      sum += @levar
+      sum += @levar
+      sum += @levar
+      sum += @levar
+      sum += @levar
+      sum += @levar
+      sum += @levar
+      sum += @levar
+      sum += @levar
+      i += 1
+    end
+
+    return sum
+  end
+end
+
+module TheModule
+  @v0 = 1
+  @v1 = 2
+  @v2 = 3
+  @levar = 1
+
+  def self.get_value_loop
+    sum = 0
+
+    # 1M
+    i = 0
+    while i < 1000000
+      # 10 times to de-emphasize loop overhead
+      sum += @levar
+      sum += @levar
+      sum += @levar
+      sum += @levar
+      sum += @levar
+      sum += @levar
+      sum += @levar
+      sum += @levar
+      sum += @levar
+      sum += @levar
+      i += 1
+    end
+
+    return sum
+  end
+end
+
+run_benchmark(850) do
+  TheClass.get_value_loop
+  TheModule.get_value_loop
+end