Merge pull request rubinius#1019 from dudleyf/bench-date-parse

Add Date.parse benchmark.

benchmark/core/date/bench_parse.rb

@@ -0,0 +1,62 @@
+require 'benchmark'
+require 'benchmark/ips'
+require 'date'
+
+Benchmark.ips do |x|
+  iso_8601_date_only_locale_neutral = "2011-03-08"
+  iso_8601_date_only_modified = "2011-Mar-08"
+  rfc2822_date = "08 Mar 11"
+
+  format_c = "Fri Jan 02 2004"
+  format_d = "Fri, 02 Jan 2004"
+  format_e = "2011/03/08"
+
+  x.report "parse '#{iso_8601_date_only_locale_neutral}'" do |times|
+    i = 0
+    while i < times
+      Date.parse(iso_8601_date_only_locale_neutral)
+      i += 1
+    end
+  end
+
+  x.report "parse '#{iso_8601_date_only_modified}'" do |times|
+    i = 0
+    while i < times
+      Date.parse(iso_8601_date_only_modified)
+      i += 1
+    end
+  end
+
+  x.report "parse '#{rfc2822_date}'" do |times|
+    i = 0
+    while i < times
+      Date.parse(rfc2822_date)
+      i += 1
+    end
+  end
+
+  x.report "parse '#{format_c}'" do |times|
+    i = 0
+    while i < times
+      Date.parse(format_c)
+      i += 1
+    end
+  end
+
+  x.report "parse '#{format_d}'" do |times|
+    i = 0
+    while i < times
+      Date.parse(format_d)
+      i += 1
+    end
+  end
+
+  x.report "parse '#{format_e}'" do |times|
+    i = 0
+    while i < times
+      Date.parse(format_e)
+      i += 1
+    end
+  end
+
+end