Add build files for benchmarkings; add mandelbrot benchmark

5 files changed, 111 insertions, 2 deletions

diff --git a/benchmark/bm_so_mandelbrot.rb b/benchmark/bm_so_mandelbrot.rb
new file mode 100644
index 000000000..dd1d75ba1
--- /dev/null
+++ b/benchmark/bm_so_mandelbrot.rb
@@ -0,0 +1,64 @@
+#  The Computer Language Benchmarks Game
+#  http://shootout.alioth.debian.org/
+#
+#  contributed by Karl von Laudermann
+#  modified by Jeremy Echols
+size = 1000 # ARGV[0].to_i
+
+puts "P4\n#{size} #{size}"
+
+ITER = 49                           # Iterations - 1 for easy for..in looping
+LIMIT_SQUARED = 4.0                 # Presquared limit
+
+byte_acc = 0
+bit_num = 0
+
+count_size = size - 1               # Precomputed size for easy for..in looping
+def id(x)
+  x
+end
+
+# For..in loops are faster than .upto, .downto, .times, etc.
+for y in 0..count_size
+  for x in 0..count_size
+    zr = 0.0
+    zi = 0.0
+    cr = (2.0*x/size)-1.5
+    ci = (2.0*y/size)-1.0
+    escape = false
+
+    # To make use of the for..in code, we use a dummy variable,
+    # like one would in C
+    for dummy in 0..ITER
+      tr = zr*zr - zi*zi + cr
+      ti = 2*zr*zi + ci
+      zr, zi = tr, ti
+
+      if (zr*zr+zi*zi) > LIMIT_SQUARED
+        escape = true
+        break
+      end
+    end
+
+#    byte_acc = (byte_acc << 1) | (escape ? 0b0 : 0b1)
+    byte_acc = (byte_acc * 2) | (escape ? 0b0 : 0b1)
+#    byte_acc = (byte_acc * 2) + (escape ? 0b0 : 0b1)
+#    byte_acc = (byte_acc * 2) + 1
+
+    bit_num += 1
+
+    # Code is very similar for these cases, but using separate blocks
+    # ensures we skip the shifting when it's unnecessary, which is most cases.
+    if (bit_num == 8)
+#      print byte_acc.chr
+      byte_acc = 0
+      bit_num = 0
+    elsif (x == count_size)
+      byte_acc <<= (8 - bit_num)
+#      byte_acc = byte_acc << (8 - bit_num)
+#      print byte_acc.chr
+      byte_acc = 0
+      bit_num = 0
+    end
+  end
+end
diff --git a/benchmark/build_config_boxing.rb b/benchmark/build_config_boxing.rb
new file mode 100644
index 000000000..b478c9005
--- /dev/null
+++ b/benchmark/build_config_boxing.rb
@@ -0,0 +1,28 @@
+MRuby::Build.new do |conf|
+  toolchain :gcc
+end
+
+MRuby::Build.new('no_boxing') do |conf|
+  toolchain :gcc
+
+  conf.gembox 'default'
+end
+
+MRuby::Build.new('word_boxing') do |conf|
+  toolchain :gcc
+
+  conf.gembox 'default'
+  conf.compilers.each do |c|
+    c.defines += %w(MRB_WORD_BOXING)
+  end
+end
+
+MRuby::Build.new('nan_boxing') do |conf|
+  toolchain :gcc
+
+  conf.gembox 'default'
+  conf.compilers.each do |c|
+    c.defines += %w(MRB_NAN_BOXING)
+  end
+end
+
diff --git a/benchmark/build_config_cc.rb b/benchmark/build_config_cc.rb
new file mode 100644
index 000000000..56d725bc7
--- /dev/null
+++ b/benchmark/build_config_cc.rb
@@ -0,0 +1,13 @@
+MRuby::Build.new do |conf|
+  toolchain :gcc
+end
+
+MRuby::Build.new('gcc') do |conf|
+  toolchain :gcc
+  conf.gembox 'default'
+end
+
+MRuby::Build.new('clang') do |conf|
+  toolchain :clang
+  conf.gembox 'default'
+end
diff --git a/benchmark/fib39.rb b/benchmark/fib.rb
index d5565b779..4b395f9cc 100644
--- a/benchmark/fib39.rb
+++ b/benchmark/fib.rb
@@ -1,8 +1,7 @@
-# Fib 39
 
 def fib n
   return n if n < 2
   fib(n-2) + fib(n-1)
 end
 
-puts fib(39)
+puts fib(37)
diff --git a/benchmark/plot.gpl b/benchmark/plot.gpl
new file mode 100644
index 000000000..639674d68
--- /dev/null
+++ b/benchmark/plot.gpl
@@ -0,0 +1,5 @@
+set yrange [0:]
+set terminal pdf
+set xtics rotate by -45
+set style histogram errorbars gap 2 lw 1
+set style fill solid border -1