mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
433af16167
benchmark/*.rb is only benchmarks now. We don't need prefixes. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63928 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
57 lines
1.4 KiB
Ruby
57 lines
1.4 KiB
Ruby
# The Computer Language Benchmarks Game
|
|
# http://shootout.alioth.debian.org/
|
|
#
|
|
# contributed by Karl von Laudermann
|
|
# modified by Jeremy Echols
|
|
|
|
size = 600 # 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
|
|
|
|
# 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)
|
|
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)
|
|
print byte_acc.chr
|
|
byte_acc = 0
|
|
bit_num = 0
|
|
end
|
|
end
|
|
end
|