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Re^7: High Performance Game of Life

by marioroy (Priest)
on Aug 13, 2017 at 10:31 UTC ( #1197328=note: print w/replies, xml ) Need Help??


in reply to Re^6: High Performance Game of Life
in thread High Performance Game of Life

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.

For a last attempt in reaching 10x, I tried combining two integers into one via bit-manipulation. Having to support ($x) being negative made bit-manipulation more complicated. However, it runs as fast as pack('ii').

This was an exercise and nothing more. I thought why not try bit-shifting the two integers into one.

package Organism; use strict; # use warnings; sub _pack { my ( $x, $y ) = @_; $x < 0 ? -(abs($x) << 32 | $y) : $x << 32 | $y; } sub _unpack { my ( $n ) = @_; return $n < 0 ? ( -( abs($n) >> 32 ), abs($n) & 0xFFFFFFFF ) : ( $n >> 32 , $n & 0xFFFFFFFF ); } 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 } } # 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 ); for my $c (keys %{ $cells }) { # Get the (up to 8) dead cells surrounding the cell ( $x0, $y0 ) = $c < 0 ? ( -( abs($c) >> 32 ), abs($c) & 0xFFFFFFFF ) : ( $c >> 32 , $c & 0xFFFFFFFF ); ( $x1, $x2, $y1, $y2 ) = ( $x0 - 1, $x0 + 1, $y0 - 1, $y0 + 1 ); my @zcells = ( ($k1 = $x1 < 0 ? -(abs($x1) << 32 | $y1) : $x1 << 32 | $y1) x + !(exists $cells->{$k1}), ($k2 = $x1 < 0 ? -(abs($x1) << 32 | $y0) : $x1 << 32 | $y0) x + !(exists $cells->{$k2}), ($k3 = $x1 < 0 ? -(abs($x1) << 32 | $y2) : $x1 << 32 | $y2) x + !(exists $cells->{$k3}), ($k4 = $x0 < 0 ? -(abs($x0) << 32 | $y1) : $x0 << 32 | $y1) x + !(exists $cells->{$k4}), ($k5 = $x0 < 0 ? -(abs($x0) << 32 | $y2) : $x0 << 32 | $y2) x + !(exists $cells->{$k5}), ($k6 = $x2 < 0 ? -(abs($x2) << 32 | $y1) : $x2 << 32 | $y1) x + !(exists $cells->{$k6}), ($k7 = $x2 < 0 ? -(abs($x2) << 32 | $y0) : $x2 << 32 | $y0) x + !(exists $cells->{$k7}), ($k8 = $x2 < 0 ? -(abs($x2) << 32 | $y2) : $x2 << 32 | $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; # Check the dead cells for my $z (@zcells) { ( $x0, $y0 ) = $z < 0 ? ( -( abs($z) >> 32 ), abs($z) & 0xFFFFFFFF ) : ( $z >> 32 , $z & 0xFFFFFFFF ); ( $x1, $x2, $y1, $y2 ) = ( $x0 - 1, $x0 + 1, $y0 - 1, $y0 + 1 + ); # Get num live ( ( exists $cells->{ $x1 < 0 ? -(abs($x1) << 32 | $y1) : $x +1 << 32 | $y1 } ) + ( exists $cells->{ $x1 < 0 ? -(abs($x1) << 32 | $y0) : $x +1 << 32 | $y0 } ) + ( exists $cells->{ $x1 < 0 ? -(abs($x1) << 32 | $y2) : $x +1 << 32 | $y2 } ) + ( exists $cells->{ $x0 < 0 ? -(abs($x0) << 32 | $y1) : $x +0 << 32 | $y1 } ) + ( exists $cells->{ $x0 < 0 ? -(abs($x0) << 32 | $y2) : $x +0 << 32 | $y2 } ) + ( exists $cells->{ $x2 < 0 ? -(abs($x2) << 32 | $y1) : $x +2 << 32 | $y1 } ) + ( exists $cells->{ $x2 < 0 ? -(abs($x2) << 32 | $y0) : $x +2 << 32 | $y0 } ) + ( exists $cells->{ $x2 < 0 ? -(abs($x2) << 32 | $y2) : $x +2 << 32 | $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

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