From: utzoo!decvax!cca!gwyn@Brl@sri-unix
Newsgroups: net.unix-wizards
Title: Re:  csv versus csav
Article-I.D.: sri-unix.4398
Posted: Thu Nov 25 05:46:28 1982
Received: Fri Nov 26 02:10:36 1982

From:     Doug Gwyn <gwyn@Brl>
Date:     24 Nov 82 18:05:12-EST (Wed)
The relative speed of csv and csav is processor-dependent.  It does
appear that on most processors csv would be a tiny bit faster.  My
guess is that the "tst -(sp)" in csav to obtain an extra scratch
cell on the top of the stack was added after the original timing
measurements, since without this instruction csav is definitely
faster.

The interrupt problem csav was supposed to solve involves having
a signal interrupt the csv sequence, then a longjmp() performed by
the signal catcher.  I haven't traced through the sequence of
events involved, though.