https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50417
--- Comment #11 from Oleg Endo <olegendo at gcc dot gnu.org> ---
(In reply to rguent...@suse.de from comment #10)
>
> What makes the parameter type special? Would
>
> void test (const int *a, int *b)
> {
> std::memcpy ((char *)b, (char *)a, t);
> }
>
> be invalid to optimize to an aligned copy in your eyes?
I think it's perfectly valid to optimize this case. It could as well be
something like:
void test (const int *a, int *b)
{
a[100] = 1;
b[200] = 2;
std::memcpy ((char *)b, (char *)a, t);
}
where a[100] and b[200] both would result in 32 bit accesses, not 4x1 byte or
something, because the base pointer is assumed to be int aligned. Why should
memcpy be any different?
