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devel / comp.arch / Re: On the pitfalls of C and UB: C23 seems to be even worse. :-(

SubjectAuthor
* Re: On the pitfalls of C and UB: C23 seems to be even worse. :-(Tim Rentsch
`* Re: On the pitfalls of C and UB: C23 seems to be even worse. :-(Scott Lurndal
 `- Re: On the pitfalls of C and UB: C23 seems to be even worse. :-(Tim Rentsch

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Re: On the pitfalls of C and UB: C23 seems to be even worse. :-(

<864jlyz93n.fsf@linuxsc.com>

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From: tr.17687@z991.linuxsc.com (Tim Rentsch)
Newsgroups: comp.arch
Subject: Re: On the pitfalls of C and UB: C23 seems to be even worse. :-(
Date: Thu, 20 Jul 2023 12:17:00 -0700
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 by: Tim Rentsch - Thu, 20 Jul 2023 19:17 UTC

scott@slp53.sl.home (Scott Lurndal) writes:

[...]

> An array object that encompasses the entire virtual address space
> is easily defined on modern (nonsegmented) processors, in which case
> ptrdiff_t is defined for subtraction of any two virtual addresses.

The ISO C standard does not make that guarantee. A value of
type ptrdiff_t must be at least 17 bits, including the sign
bit. If subtraction of two pointers gives a value outside
the range of ptrdiff_t, the behavior is undefined.

Re: On the pitfalls of C and UB: C23 seems to be even worse. :-(

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From: scott@slp53.sl.home (Scott Lurndal)
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Subject: Re: On the pitfalls of C and UB: C23 seems to be even worse. :-(
Newsgroups: comp.arch
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 by: Scott Lurndal - Fri, 21 Jul 2023 14:01 UTC

Tim Rentsch <tr.17687@z991.linuxsc.com> writes:
>scott@slp53.sl.home (Scott Lurndal) writes:
>
>[...]
>
>> An array object that encompasses the entire virtual address space
>> is easily defined on modern (nonsegmented) processors, in which case
>> ptrdiff_t is defined for subtraction of any two virtual addresses.
>
>The ISO C standard does not make that guarantee.

I never made such a claim. This isn't comp.lang.c

Re: On the pitfalls of C and UB: C23 seems to be even worse. :-(

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From: tr.17687@z991.linuxsc.com (Tim Rentsch)
Newsgroups: comp.arch
Subject: Re: On the pitfalls of C and UB: C23 seems to be even worse. :-(
Date: Sat, 22 Jul 2023 07:12:01 -0700
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 by: Tim Rentsch - Sat, 22 Jul 2023 14:12 UTC

scott@slp53.sl.home (Scott Lurndal) writes:

> Tim Rentsch <tr.17687@z991.linuxsc.com> writes:
>
>> scott@slp53.sl.home (Scott Lurndal) writes:
>>
>> [...]
>>
>>> An array object that encompasses the entire virtual address space
>>> is easily defined on modern (nonsegmented) processors, in which case
>>> ptrdiff_t is defined for subtraction of any two virtual addresses.
>>
>> The ISO C standard does not make that guarantee.
>
> I never made such a claim.

I didn't say you did.

> This isn't comp.lang.c

I'm not trying to start a debate. My comment was offered
for the benefit of people who are interested in knowing
the facts. I believe that such people participate in this
newsgroup, and some of those may not read comp.lang.c.

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