Make negative numbers positive, shift them and make them negative again: 

sub SRshift { 
    $_[0] < 0 
        ? -( -$_[0] >> $_[1] ) 
        :     $_[0] >> $_[1] 
}

[download]

Should work on any platform regardless of native integer size.

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The start of some sanity?

In reply to Re: Implementing a signed/sign-propagating right bitwise shift by BrowserUk
in thread Implementing a signed/sign-propagating right bitwise shift by LonelyPilgrim

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