Re: [MIT-Scheme-devel] Is it still a PORT?

[Taylor R Campbell]

   Date: Tue, 24 Nov 2009 09:37:39 -0800
   From: Joe Marshall <address@hidden>

   It turns out that when you read a source code file that the
   inner loop of the parser does a lot of superfluous checking
   of PORT?  Although PORT? is an inexpensive operation,
   it still involves an out-of-line call, and it gets called eleven times
   for each character of input.

Hmm...  How about caching the values of (port/operation/read-char
port) and (port/operation port 'DISCRETIONARY-WRITE-CHAR) in the db,
which should also avoid some ASSQ calls?