/bench/truffle/metrics/mandelbrot.rb

# Copyright © 2004-2013 Brent Fulgham
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#   * Redistributions of source code must retain the above copyright notice,
#     this list of conditions and the following disclaimer.
#
#   * Redistributions in binary form must reproduce the above copyright notice,
#     this list of conditions and the following disclaimer in the documentation
#     and/or other materials provided with the distribution.
#
#   * Neither the name of "The Computer Language Benchmarks Game" nor the name
#     of "The Computer Language Shootout Benchmarks" nor the names of its
#     contributors may be used to endorse or promote products derived from this
#     software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# The Computer Language Benchmarks Game
# http://benchmarksgame.alioth.debian.org
#
#  contributed by Karl von Laudermann
#  modified by Jeremy Echols
#  modified by Detlef Reichl
#  modified by Joseph LaFata
#  modified by Peter Zotov

# http://benchmarksgame.alioth.debian.org/u64q/program.php?test=mandelbrot&lang=yarv&id=3

def mandelbrot(size)
  Truffle::Graal.assert_not_compiled
  
  sum = 0

  byte_acc = 0
  bit_num = 0

  y = 0
  while y < size
    ci = (2.0*y/size)-1.0

    x = 0
    while x < size
      zrzr = zr = 0.0
      zizi = zi = 0.0
      cr = (2.0*x/size)-1.5
      escape = 0b1

      z = 0
      while z < 50
        tr = zrzr - zizi + cr
        ti = 2.0*zr*zi + ci
        zr = tr
        zi = ti
        # preserve recalculation
        zrzr = zr*zr
        zizi = zi*zi
        if zrzr+zizi > 4.0
          escape = 0b0
          break
        end
        z += 1
      end

      byte_acc = (byte_acc << 1) | escape
      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
        sum ^= byte_acc
        byte_acc = 0
        bit_num = 0
      elsif (x == size - 1)
        byte_acc <<= (8 - bit_num)
        #print byte_acc.chr
        sum ^= byte_acc
        byte_acc = 0
        bit_num = 0
      end
      x += 1
    end
    y += 1
  end

  sum
end

start = Time.now

begin
  loop do
    mandelbrot 750
  end
rescue RubyTruffleError
  puts Time.now - start
end