comment on

On my laptop, the following shaves 4 seconds from one-time stringification per key.

# 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 );
   my ( $k1, $k2, $k3, $k4, $k5, $k6, $k7, $k8 );

   ( ( $k1 = "$x1:$y1" ) x !( 0 + exists $cells->{ $k1 } ),
     ( $k2 = "$x1:$y0" ) x !( 0 + exists $cells->{ $k2 } ),
     ( $k3 = "$x1:$y2" ) x !( 0 + exists $cells->{ $k3 } ),
     ( $k4 = "$x0:$y1" ) x !( 0 + exists $cells->{ $k4 } ),
     ( $k5 = "$x0:$y2" ) x !( 0 + exists $cells->{ $k5 } ),
     ( $k6 = "$x2:$y1" ) x !( 0 + exists $cells->{ $k6 } ),
     ( $k7 = "$x2:$y0" ) x !( 0 + exists $cells->{ $k7 } ),
     ( $k8 = "$x2:$y2" ) x !( 0 + exists $cells->{ $k8 } ) );
}
[download]

To not allocate the key variables each time, another 2 seconds reduction is possible with the state feature.

use feature 'state';

# 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 );

   ( ( $k1 = "$x1:$y1" ) x !( 0 + exists $cells->{ $k1 } ),
     ( $k2 = "$x1:$y0" ) x !( 0 + exists $cells->{ $k2 } ),
     ( $k3 = "$x1:$y2" ) x !( 0 + exists $cells->{ $k3 } ),
     ( $k4 = "$x0:$y1" ) x !( 0 + exists $cells->{ $k4 } ),
     ( $k5 = "$x0:$y2" ) x !( 0 + exists $cells->{ $k5 } ),
     ( $k6 = "$x2:$y1" ) x !( 0 + exists $cells->{ $k6 } ),
     ( $k7 = "$x2:$y0" ) x !( 0 + exists $cells->{ $k7 } ),
     ( $k8 = "$x2:$y2" ) x !( 0 + exists $cells->{ $k8 } ) );
}
[download]

Regards, Mario

In reply to Re^3: High Performance Game of Life by marioroy
in thread High Performance Game of Life by eyepopslikeamosquito

Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
Want more info? How to link or How to display code and escape characters are good places to start.


Think about Loose Coupling
	PerlMonks