t-count check in the vast majority of procedure prologues.</li>

<li> Especially <b>conditional expressions</b> could benefit from some
more inlining and integration with their parent <tt>if</tt>; currently
only <tt>null?</tt>, <tt>eq?</tt>, and <tt>not</tt> have this special
handling.  (Although that covers about half of the conditionals in the
compiler.)  The procedure-call-and-return-and-test overhead totals
about 18 instructions.  The implementation of <tt>case</tt> is
particularly inefficient because i