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From: kegs@provalid.com (Kent Dickey)
Newsgroups: comp.arch
Subject: Re: is Vax addressing sane today
Date: Tue, 24 Sep 2024 15:47:21 -0000 (UTC)
Organization: provalid.com
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In article <vcpidc$29e51$1@dont-email.me>,
Thomas Koenig  <tkoenig@netcologne.de> wrote:
>Kent Dickey <kegs@provalid.com> schrieb:
>
>> Trapping on overflow is basically useless other than as a debug aid,
>> which clearly nobody values.
>
>I disagree.
>
>Look at the sanitizer libraries, which insert runtime checks for
>integer overflow - having less overhead for these would definitely
>be a plus.
>
>See https://gcc.gnu.org/onlinedocs/gcc/Instrumentation-Options.html
>or
>https://github.com/google/sanitizers/wiki/AddressSanitizerFlags#run-time-flags
>.

Not valuing something just means no one is spending a lot of time/effort
on it.  Decimal math is not valued--but you can still do it, it just
has no special instructions on most architectures to make it fast/easy.
And as I've pointed out, trapping on integer overflow is clearly not
valued--on x86, where INTO exists, GCC and Clang do not use it.

Kent