http://www.perlmonks.org?node_id=1197321


in reply to Re^4: High Performance Game of Life
in thread High Performance Game of Life

Update: pack 'i2' is more efficient than pack 'ii'

Organism.pm optimized with pack/unpack 'i2' and inlining critical paths.

package Organism; use strict; use warnings; use feature 'state'; sub count { return scalar keys %{ shift->{Cells} }; } # Input a list of [ x, y ] coords sub insert_cells { my $cells = shift->{Cells}; for my $r (@_) { $cells->{ pack 'i2', @{$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 'i2', $_ ] } keys %{ shift->{Cells} }; } # Return the list of dead cells surrounding a cell sub get_dead_cells { my ( $cells, $x0, $y0 ) = ( shift->{Cells}, @_ ); my ( $x1, $x2, $y1, $y2 ) = ( $x0 - 1, $x0 + 1, $y0 - 1, $y0 + 1 ); state ( $k1, $k2, $k3, $k4, $k5, $k6, $k7, $k8 ); ( ( $k1 = pack 'i2', $x1, $y1 ) x !( 0 + exists $cells->{ $k1 } ), ( $k2 = pack 'i2', $x1, $y0 ) x !( 0 + exists $cells->{ $k2 } ), ( $k3 = pack 'i2', $x1, $y2 ) x !( 0 + exists $cells->{ $k3 } ), ( $k4 = pack 'i2', $x0, $y1 ) x !( 0 + exists $cells->{ $k4 } ), ( $k5 = pack 'i2', $x0, $y2 ) x !( 0 + exists $cells->{ $k5 } ), ( $k6 = pack 'i2', $x2, $y1 ) x !( 0 + exists $cells->{ $k6 } ), ( $k7 = pack 'i2', $x2, $y0 ) x !( 0 + exists $cells->{ $k7 } ), ( $k8 = pack 'i2', $x2, $y2 ) x !( 0 + exists $cells->{ $k8 } ) ) +; } sub tick { my $self = shift; my $cells = $self->{Cells}; my %new_cells; for my $c (keys %{ $cells }) { # Get the (up to 8) dead cells surrounding the cell my @zcells = $self->get_dead_cells( unpack 'i2', $c ); # Check the live cell # Note: next line equivalent to nlive == 2 || nlive == 3 @zcells == 5 || @zcells == 6 and $new_cells{$c} = undef; # Check the dead cells for my $z (@zcells) { state ( $x0, $x1, $x2, $y0, $y1, $y2 ); ( $x0, $y0 ) = unpack 'i2', $z; ( $x1, $x2, $y1, $y2 ) = ( $x0 - 1, $x0 + 1, $y0 - 1, $y0 + 1 + ); # Get num live ( ( 0 + exists $cells->{ pack 'i2', $x1, $y1 } ) + ( 0 + exists $cells->{ pack 'i2', $x1, $y0 } ) + ( 0 + exists $cells->{ pack 'i2', $x1, $y2 } ) + ( 0 + exists $cells->{ pack 'i2', $x0, $y1 } ) + ( 0 + exists $cells->{ pack 'i2', $x0, $y2 } ) + ( 0 + exists $cells->{ pack 'i2', $x2, $y1 } ) + ( 0 + exists $cells->{ pack 'i2', $x2, $y0 } ) + ( 0 + exists $cells->{ pack 'i2', $x2, $y2 } ) ) == 3 and $new_cells{$z} = undef; } } $self->{Cells} = \%new_cells; } sub new { my $class = shift; my %init_self = ( Cells => {} ); bless \%init_self, $class; } 1;

Regards, Mario