Just because perl issues a warning, it doesn't mean perl doesn't do the right thing. It's true, converting "0x000fffff7f00fffc" with hex is non-portable as it won't do the same thing on a 32-bit perl (to which I say, so what? Adding number isn't portable either, as you may get different results as well, but addition doesn't come with a warning).
$ perl -wE 'say hex "0x000fffff7f00fffc"'
Hexadecimal number > 0xffffffff non-portable at -e line 1.
4503597463175164
Just use your 64-bit perl, and turn off the warning.
perl -E 'say hex "0x000fffff7f00fffc"'
4503597463175164
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