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From: mitchalsup@aol.com (MitchAlsup1)
Newsgroups: comp.arch
Subject: Re: is Vax addressing sane today
Date: Fri, 20 Sep 2024 22:00:28 +0000
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On Fri, 20 Sep 2024 18:35:26 +0000, Kent Dickey wrote:

> In article <2024Sep10.094353@mips.complang.tuwien.ac.at>,

>>Alpha got on that bandwagon early.  It's a descendent of MIPS, but it
>>renamed add into addv, and addu into add.  It has been canceled around
>>the year 2000.
>
> [ More details about architectures without trapping overflow
> instructions ]
>
> Trapping on overflow is basically useless other than as a debug aid,
> which clearly nobody values.  If you take Rust's approach, and only
> detect overflow in debug builds, then you already don't care about
> performance.
>
> If you want to do almost anything at all other than core dump on
> overflow, you need to branch to recovery code.  And although it's
> theoretically possible to recover from the trap, it's worse than any
> other approach.  So it's added hardware that's HARDER for software to
> use.  No surprise it's gone away.

Note: Linux does not even have an "Integer Overflow" signal, while
it does have a "FP exception" signal.

But then IEEE 754 exception semantics make even less sense than
Linux signals. ...