How can I check whether my Perl installation is 32 or 64 bit?

Question

On Windows, how can I check whether my Perl installation is 32 or 64 bit?

Answer 1

log(~0 +1)/log(2) works because :

• ~0 is "bitwise not zero" -> UINT_MAX
• UINT_MAX is either 2^32-1 or 2^64-1, depending on the architecture (or compile options)
• log(2^32)/log(2) = 32 and log(2^64)/log(2) = 64, by design.

So basically this command order perl to say how many bits have its UINT_MAX.

$ perl -e "print log(~0 +1)/log(2)" 32 $ perl -V:archname archname='MSWin32-x86-multi-thread';