On Thu, Apr 7, 2022 at 5:24 PM David Marchand wrote:
> On Thu, Mar 10, 2022 at 3:55 PM Ananyev, Konstantin
> wrote:
> > > Calls to rte_memcpy for 1 < n < 16 could result in unaligned
> > > loads/stores, which is undefined behaviour according to the C
> > > standard, and strict aliasing violations
Hello Luc,
On Fri, May 13, 2022 at 9:16 PM Luc Pelletier wrote:
> > > Actually, looking again at the history, it fixes:
> > > Fixes: f5472703c0bd ("eal: optimize aligned memcpy on x86")
> >
> > Nop, that's probably even older, could you double check?
> > I'll hold on pushing this fix.
>
> It seem
Hi David,
> > Actually, looking again at the history, it fixes:
> > Fixes: f5472703c0bd ("eal: optimize aligned memcpy on x86")
>
> Nop, that's probably even older, could you double check?
> I'll hold on pushing this fix.
It seems you still haven't received a response. I'll take a stab at this.
Hi David,
Le jeu. 7 avr. 2022 à 11:24, David Marchand
a écrit :
> > As a side note, we probably need to check other similar places in DPDK code.
>
> What would be the best way to detect those problematic places?
As far as I'm aware, there is no silver bullet to detect all strict
aliasing violat
On Thu, Apr 7, 2022 at 5:32 PM David Marchand wrote:
>
> On Thu, Apr 7, 2022 at 5:24 PM David Marchand
> wrote:
> >
> > On Thu, Mar 10, 2022 at 3:55 PM Ananyev, Konstantin
> > wrote:
> > > > Calls to rte_memcpy for 1 < n < 16 could result in unaligned
> > > > loads/stores, which is undefined be
On Thu, Apr 7, 2022 at 5:24 PM David Marchand wrote:
>
> On Thu, Mar 10, 2022 at 3:55 PM Ananyev, Konstantin
> wrote:
> > > Calls to rte_memcpy for 1 < n < 16 could result in unaligned
> > > loads/stores, which is undefined behaviour according to the C
> > > standard, and strict aliasing violatio
On Thu, Mar 10, 2022 at 3:55 PM Ananyev, Konstantin
wrote:
> > Calls to rte_memcpy for 1 < n < 16 could result in unaligned
> > loads/stores, which is undefined behaviour according to the C
> > standard, and strict aliasing violations.
> >
> > The code was changed to use a packed structure that al
> Calls to rte_memcpy for 1 < n < 16 could result in unaligned
> loads/stores, which is undefined behaviour according to the C
> standard, and strict aliasing violations.
>
> The code was changed to use a packed structure that allows aliasing
> (using the __may_alias__ attribute) to perform the
Calls to rte_memcpy for 1 < n < 16 could result in unaligned
loads/stores, which is undefined behaviour according to the C
standard, and strict aliasing violations.
The code was changed to use a packed structure that allows aliasing
(using the __may_alias__ attribute) to perform the load/store
ope
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