From: utzoo!decvax!decwrl!sun!megatest!fortune!hpda!hplabs!sri-unix!lee%usc-cse@USC-ECL
Newsgroups: net.unix-wizards
Title: Re: /lib/c2 optimizer for Berkeley 4.1
Article-I.D.: sri-arpa.830
Posted: Wed Mar 23 15:12:00 1983
Received: Thu Apr  7 03:57:27 1983

There is not reason not to replace cvtl[bw] with mov[bw] in the cases
where the source operand is a constant that is negative or larger than
64.  Zero of course can be moved with clr[bw].  There is no advantage
(or disadvantage) to the replacement if the constant is in the range
1-63 (or 64, I forget which) since the constant is stored in literal
form in a single byte operand descriptor in either instruction.
						-- Lee