Anybody else care to try?
Using 5.6.0 on Win32, I get repeated
Deep recursion on subroutine "main::A" at ack.pl line 11.
Deep recursion on subroutine "main::A" at ack.pl line 13.
Looking at your code, I distrust what you are doing to save stack space.
Update: Yup. Add
print "A($_[0],$_[1])\n";
to the top of the function to watch it run off the rails. This is not a correct implementation of the Ackerman function.
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