https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36602
--- Comment #17 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #10)
> (In reply to Andi Kleen from comment #9)
> > Any progress on fixing the test case, so that this can be finally fixed?
>
> I have no idea how to do that without making the testcase test sth different.
> We could of course simply turn off SRA for it ...
>
> That said, the difference the optimization may cause might be surprising to
> people. That is, that the following may abort()
>
> struct f { char c; int i; };
> struct f2 { int i; int j; };
> int main()
> {
> struct f f;
> struct f2 f2;
> memset(&f, 0, sizeof (f));
> memcpy(&f2, f, sizeof (f));
> if (memcmp (&f, &f2) != 0)
> abort ();
> return 0;
> }
So the above was mostly handled with r7-5443-g7b45d0dfeb5f85 (and improved
r15-3544-g2067df800df930 which allows the use of memset earlier).
Note the original testcase was "fixed" in GCC 5. Though There might be others
where still are issues.
