http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49872
--- Comment #2 from sgunderson at bigfoot dot com 2011-07-28 10:09:51 UTC ---
I'm not sure if I've seen exactly this construction in real-world code, but
I've certainly seen examples of the hybrid I sketched out (looking at one was
what motivated me to file the bug), ie. something like:
struct S {
int f[1024];
int g;
};
void func(struct S* s)
{
memset(s->f, 0, sizeof(s->f));
s->g = 0;
}
which I would argue should be rewritten to
void func(struct S* s)
{
memset(s->f, 0, sizeof(s->f) + sizeof(s->g));
}
I'd argue that programmers should not be doing this kind of optimization
themselves, since it's very prone to break when changing the structure,
especially as alignment etc. comes into play.
