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From: Paul Rubin <no.email@nospam.invalid>
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Subject: Re: EXIT THEN
Date: Sat, 11 Feb 2017 23:07:07 -0800
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rickman <gnuarm@gmail.com> writes:
> When designing CPUs the multiplexers will blow up your logic counts if
> you aren't careful.  So in a stack processor it is not likely to see
> TUCK as a hardware primitive unless it uses multiple clock cycles
> (anathema in my designs).

In a fancy-ass processor maybe it can be done by register renaming.