"Stefan Kanthak" <stefan.kanthak@nexgo.de> writes:

> "Jonathan Wakely" <jwakely.gcc@gmail.com> wrote:
>
>> On Fri, 26 May 2023, 08:01 Andrew Pinski via Gcc, <gcc@gcc.gnu.org> wrote:
>>
>>> On Thu, May 25, 2023 at 11:56?PM Stefan Kanthak <stefan.kanthak@nexgo.de>
>>> wrote:
>>>>
>>>> Hi,
>>>>
>>>> compile the following function on a system with Core2 processor
>>>> (released January 2008) for the 32-bit execution environment:
>>>>
>>>> --- demo.c ---
>>>> int ispowerof2(unsigned long long argument)
>>>> {
>>>>     return (argument & argument - 1) == 0;
>>>> }
>>>> --- EOF ---
>>>>
>>>> GCC 13.3: gcc -m32 -O3 demo.c
>>>>
>>>> NOTE: -mtune=native is the default!
>>>
>>> You need to use -march=native and not -mtune=native .... to turn on
>>> the architecture features.
>
> That's what I call a REALLY EPIC FAILURE!

Please read https://gcc.gnu.org/bugs/ carefully.