Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: Regarding assignment to struct
Date: Thu, 29 May 2025 14:54:53 -0700
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scott@slp53.sl.home (Scott Lurndal) writes:
[...]
> And sometimes, excessive use of the comma operator causes
> compiler failures.
>
> cfront generated the comma operator extensively, and expression trees
> would grow to very large sizes.   There was a bug in PCC (for the
> 88100) where it would run out of temporary registers while generating
> code for some cfront generated comma expressions (which were -far- from
> human readable).    I had to fix the temporary register allocation
> code in PCC to spill registers when the sethi-ullman number for an
> expression exceeded the number of registers.
> 
> That was circa 1990, and I've generally not found any arguments
> favoring their general use persuasive in the years since, including
> Andrey's and Kaz's responses recently posted here.

So a compiler you used circa 1990 had problems with comma expressions.

That's hardly an argument against using comma operators today.

> The simple fact that experienced programmers that read this usenet
> newsgroup missed the comma operators in the original example speaks
> volumes.

*That's* a valid argument.

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
void Void(void) { Void(); } /* The recursive call of the void */