From 30b2cb380e0a8f777a2fc2d736c2ccddf3362fcd Mon Sep 17 00:00:00 2001
From: ko1 <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 28 Sep 2007 10:18:53 +0000
Subject: * benchmark/driver.rb: fix notations. *
 benchmark/bm_loop_whileloop.rb: ditto. * benchmark/bm_loop_whileloop2.rb:
 ditto. * benchmark/bm_app_uri.rb: added. * benchmark/bm_vm1_ivar_set.rb:
 ditto. * benchmark/bm_so_binary_trees.rb: added from Computer Language  
 Benchmarks Game (http://shootout.alioth.debian.org/). *
 benchmark/bm_so_fannkuch.rb: ditto. * benchmark/bm_so_mandelbrot.rb: ditto. *
 benchmark/bm_so_meteor_contest.rb: ditto. * benchmark/bm_so_nbody.rb: ditto.
 * benchmark/bm_so_nsieve.rb: ditto. * benchmark/bm_so_nsieve_bits.rb: ditto.
 * benchmark/bm_so_partial_sums.rb: ditto. * benchmark/bm_so_pidigits.rb:
 ditto. * benchmark/bm_so_spectralnorm.rb: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13548 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 benchmark/bm_so_binary_trees.rb | 57 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 benchmark/bm_so_binary_trees.rb

(limited to 'benchmark/bm_so_binary_trees.rb')

diff --git a/benchmark/bm_so_binary_trees.rb b/benchmark/bm_so_binary_trees.rb
new file mode 100644
index 0000000000..138c5290f5
--- /dev/null
+++ b/benchmark/bm_so_binary_trees.rb
@@ -0,0 +1,57 @@
+# The Computer Language Shootout Benchmarks
+# http://shootout.alioth.debian.org
+#
+# contributed by Jesse Millikan
+
+# disable output
+def STDOUT.write_ *args
+end
+
+def item_check(tree)
+ if tree[0] == nil
+  tree[1]
+ else
+  tree[1] + item_check(tree[0]) - item_check(tree[2])
+ end
+end
+
+def bottom_up_tree(item, depth)
+ if depth > 0
+  item_item = 2 * item
+  depth -= 1
+  [bottom_up_tree(item_item - 1, depth), item, bottom_up_tree(item_item, depth)]
+ else
+  [nil, item, nil]
+ end
+end
+
+max_depth = 12 # 16 # ARGV[0].to_i
+min_depth = 4
+
+max_depth = min_depth + 2 if min_depth + 2 > max_depth
+
+stretch_depth = max_depth + 1
+stretch_tree = bottom_up_tree(0, stretch_depth)
+
+puts "stretch tree of depth #{stretch_depth}\t check: #{item_check(stretch_tree)}"
+stretch_tree = nil
+
+long_lived_tree = bottom_up_tree(0, max_depth)
+
+min_depth.step(max_depth + 1, 2) do |depth|
+ iterations = 2**(max_depth - depth + min_depth)
+
+ check = 0
+
+ for i in 1..iterations
+  temp_tree = bottom_up_tree(i, depth)
+  check += item_check(temp_tree)
+
+  temp_tree = bottom_up_tree(-i, depth)
+  check += item_check(temp_tree)
+ end
+
+ puts "#{iterations * 2}\t trees of depth #{depth}\t check: #{check}"
+end
+
+puts "long lived tree of depth #{max_depth}\t check: #{item_check(long_lived_tree)}"
-- 
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