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Using EQ instead of EQL to compare catch tags
- To: Kent M Pitman <KMP%MIT-OZ@MIT-MC.ARPA>
- Subject: Using EQ instead of EQL to compare catch tags
- From: "Scott E. Fahlman" <Fahlman@CMU-CS-C.ARPA>
- Date: Sun, 11 Nov 1984 00:30:00 -0000
- Cc: COMMON-LISP@SU-AI.ARPA
- In-reply-to: Msg of 10 Nov 1984 18:29-EST from Kent M Pitman <KMP%MIT-OZ at MIT-MC.ARPA>
- Sender: FAHLMAN@CMU-CS-C.ARPA
Catch/Throw is not just for signalling errors. It is used quite a bit
in our interpreter, and therefore needs to be moderately fast. EQL is
considerably slower than EQ on stock hardware, and this speed advantage,
though not terribly important, seemed to be more important than letting
people use numbers as catch-tags.
-- Scott