It would be more elegant if, rather than a huge if elsif construct, you used an array with subroutine references. The main loop would shrink to
while($alive) {
$turn++;
printf "Turn \#% 4d\t", $turn;
push @histx, $x;
push @histy, $y;
push @histh, $heading;
$pc = 0 if $pc < 0;
$pc = CODESIZE - 1 if $pc >= CODESIZE;
my $ci = $code[$pc]; # Current Instruction
print $opcode[$ci], "\t";
$pc++; # Just like CPUs do
$microcode[$ci]->(@some_params);
$pc++;
$alive = 0 if $turn > 1000;
}
which makes the main loop easier to understand and the individual instructions' code easier to find. Also, I don't see any reason why you do while($alive) { ... ; $alive = 0 if $turn > 1000; } rather than just while($turn <= 1000).
Makeshifts last the longest.
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