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Hi tybalt89. The optimization is awesome.

Update 1: Bit-manipulation will not work when \$y is negative. See this post. I assumed that \$y was always positive from testing using the initial test script.

Update 2: See this post for a version that maps two integers into one integer successfully.

I tried bit-manipulation by mapping \$x and \$y into \$n. 16-bits is enough to hold \$y.

```package Organism;

use strict;
# use warnings;

sub _pack {
my ( \$x, \$y ) = @_;
\$x < 0 ? -(abs(\$x) << 16 | \$y) : \$x << 16 | \$y;
}

sub _unpack {
my ( \$n ) = @_;
return \$n < 0
? ( -( abs(\$n) >> 16 ), abs(\$n) & 0xFFFF )
: (        \$n  >> 16  ,     \$n  & 0xFFFF );
}

sub count {
return scalar keys %{ shift->{Cells} };
}

# Input a list of [ x, y ] coords
sub insert_cells {
my \$cells = shift->{Cells};
for my \$r (@_) { \$cells->{ _pack @{\$r} } = undef }
}

# Return sorted list of cells in the Organism.
# Used for verification and testing the state of the organism.
sub get_live_cells {
sort { \$a->[0] <=> \$b->[0] || \$a->[1] <=> \$b->[1] }
map { [ _unpack \$_ ] }
keys %{ shift->{Cells} };
}

sub tick {
my \$self  = shift;
my \$cells = \$self->{Cells};
my ( \$k1, \$k2, \$k3, \$k4, \$k5, \$k6, \$k7, \$k8,
\$x0, \$x1, \$x2, \$y0, \$y1, \$y2, %new_cells, %dead_cells );

for my \$c (keys %{ \$cells }) {
# Get the (up to 8) dead cells surrounding the cell
( \$x0, \$y0 ) = \$c < 0
? ( -( abs(\$c) >> 16 ), abs(\$c) & 0xFFFF )
: (        \$c  >> 16  ,     \$c  & 0xFFFF );

( \$x1, \$x2, \$y1, \$y2 ) = ( \$x0 - 1, \$x0 + 1, \$y0 - 1, \$y0 + 1 );

\$dead_cells{\$_}++ for my @zcells = (
(\$k1 = \$x1 < 0 ? -(abs(\$x1) << 16 | \$y1) : \$x1 << 16 | \$y1) x
+ !(exists \$cells->{\$k1}),
(\$k2 = \$x1 < 0 ? -(abs(\$x1) << 16 | \$y0) : \$x1 << 16 | \$y0) x
+ !(exists \$cells->{\$k2}),
(\$k3 = \$x1 < 0 ? -(abs(\$x1) << 16 | \$y2) : \$x1 << 16 | \$y2) x
+ !(exists \$cells->{\$k3}),
(\$k4 = \$x0 < 0 ? -(abs(\$x0) << 16 | \$y1) : \$x0 << 16 | \$y1) x
+ !(exists \$cells->{\$k4}),
(\$k5 = \$x0 < 0 ? -(abs(\$x0) << 16 | \$y2) : \$x0 << 16 | \$y2) x
+ !(exists \$cells->{\$k5}),
(\$k6 = \$x2 < 0 ? -(abs(\$x2) << 16 | \$y1) : \$x2 << 16 | \$y1) x
+ !(exists \$cells->{\$k6}),
(\$k7 = \$x2 < 0 ? -(abs(\$x2) << 16 | \$y0) : \$x2 << 16 | \$y0) x
+ !(exists \$cells->{\$k7}),
(\$k8 = \$x2 < 0 ? -(abs(\$x2) << 16 | \$y2) : \$x2 << 16 | \$y2) x
+ !(exists \$cells->{\$k8}) );

# Check the live cell
# Note: next line equivalent to nlive == 2 || nlive == 3
@zcells == 5 || @zcells == 6 and \$new_cells{\$c} = undef;
}
+s;
\$self->{Cells} = \%new_cells;
}

sub new {
my \$class = shift;
my %init_self = ( Cells => {} );
bless \%init_self, \$class;
}

1;

Regards, Mario

In reply to Re^8: High Performance Game of Life by marioroy
in thread High Performance Game of Life by eyepopslikeamosquito

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