[PATCH v7] eal: fix rte_memcpy strict aliasing/alignment bugs

[David Marchand]

On Thu, Apr 7, 2022 at 5:24 PM David Marchand <david.marchand at redhat.com> wrote:
>
> On Thu, Mar 10, 2022 at 3:55 PM Ananyev, Konstantin
> <konstantin.ananyev at intel.com> 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 allows aliasing
> > > (using the __may_alias__ attribute) to perform the load/store
> > > operations. This results in code that has the same performance as the
> > > original code and that is also C standards-compliant.
> > >
> > > Fixes: d35cc1fe6a7a ("eal/x86: revert select optimized memcpy at run-time")

Actually, looking again at the history, it fixes:
Fixes: f5472703c0bd ("eal: optimize aligned memcpy on x86")

I'll change before pushing.


-- 
David Marchand