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>perl -V:ivsize
ivsize='8';

>perl -le "print unpack 'l', pack 'l', 0xFFFFFFFF << 28;"
-268435456

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C:\>perl -V:ivsize
ivsize='4';

C:\>perl -le "print unpack 'l', pack 'l', 0xFFFFFFFF << 28;"
-268435456