https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114080
--- Comment #9 from Jakub Jelinek ---
Note, most not too old compilers handle small constant size memcpy as an
efficient way to load/store unaligned values and it is also portable. So,
instead of
*dstp = *srcp ^ *bufp;
if all those can be una
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114080
--- Comment #8 from Chris Rapier ---
My apologies for misunderstanding and for coming across as aggressive in my
last response. This section of the code is about 15 years old so it hasn't,
obviously, been subject to a close enough review until n
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114080
--- Comment #7 from Andrew Pinski ---
(In reply to Chris Rapier from comment #5)
> So what you are saying is that behaviour *has* changed and what was a valid
> operation for 15 years is now invalid. I'm not mad about that. I just needed
> to kn
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114080
Jakub Jelinek changed:
What|Removed |Added
CC||jakub at gcc dot gnu.org
--- Comment #6
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114080
--- Comment #5 from Chris Rapier ---
So what you are saying is that behaviour *has* changed and what was a valid
operation for 15 years is now invalid. I'm not mad about that. I just needed to
know.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114080
--- Comment #4 from Jonathan Wakely ---
You could have checked this very easily using -fsanitize=undefined just like it
asks you to at https://gcc.gnu.org/bugs/ and at the top of the page when you
created this bug.
dst is 512-bit aligned (0x101
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114080
--- Comment #3 from Jakub Jelinek ---
The testcase segfaults since r13-1607-gc3ed9e0d6e96d8697e4bab994f8acbc5506240ee
when the backend started using more aggressively vector instructions for
operations like the 128-bit logical ops, but that does
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114080
Andrew Pinski changed:
What|Removed |Added
Status|UNCONFIRMED |RESOLVED
Resolution|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114080
--- Comment #1 from Jakub Jelinek ---
That is undefined behavior, __int128/__int128_t/__uint128_t needs 16-byte
alignment.
