Re: Preferred order of evaluation

gbcacm@ccs.neu.edu (Peter Sherwood)
15 Sep 1996 00:42:05 -0400

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Re: Preferred order of evaluation dlmoore@ix.netcom.com (David L Moore) (1996-09-07)
Re: Preferred order of evaluation ok@cs.rmit.edu.au (1996-09-15)
Re: Preferred order of evaluation dmoen@mks.com (1996-09-15)
Re: Preferred order of evaluation gbcacm@ccs.neu.edu (1996-09-15)
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From: gbcacm@ccs.neu.edu (Peter Sherwood)
Newsgroups: comp.compilers
Date: 15 Sep 1996 00:42:05 -0400
Organization: College of Computer Science, Northeastern University.
References: 96-09-021 96-09-042
Keywords: design

Jerry Leichter (leichter@smarts.com) wrote:


: MUMPS (now known as M, I guess) uses straight left-to-right evaluation.
: In M, assignment isn't an operator, so doesn't follow the left-to-right
: rule. I've never seen an explanation for M's rule...


The left-to-right evaluation is due to MUMPS' interpretive nature. It's
easiest to evaluate an expression using a single temporary (the accumulator)
with left-to-right precedence. Incidentally, early versions of MUMPS were
unable to cope with some string expressions because of this design.
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