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Date: Thu, 6 Jul 2017 21:05:12 +0200
From: Bartosz Brachaczek <b.brachaczek@...il.com>
To: musl@...ts.openwall.com
Subject: Re: Documentation of memcpy and undefined behavior in memset

On 7/6/2017 6:23 PM, Rich Felker wrote:
> I think you're correct, at least under a pessimistic interpretation of
> the standard. I can't find where they actually define "modifies", and
> you could argue that assignment of the same value twice "modifies" the
> object at most once, but I don't like relying on that kind of
> ambiguity and it's easy enough to fix just by adding a sequence point.

I don't have a copy of C11, but N1570 reads in a note to 3.1:

> ‘‘Modify’’ includes the case where the new value being stored is the same as the previous value.

Bartosz

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