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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 } ) ); }

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 } ) ); }

Regards, Mario

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

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