On Fri, 17 Mar 2023 at 09:23, Mathieu Malaterre via Gcc-help
<gcc-help@xxxxxxxxxxx> wrote:
>
> Hi all,
>
> I am trying to understand why I cannot get gcc to trigger a
> sign-conversion warning on the following:
>
> % cat tu.c
> #include <immintrin.h>
>
> extern unsigned int bar();
>
> __m128i foo(__m128i a)
> {
> return _mm_srai_epi64(a, bar());
> }
>
> On Debian/sid:
>
> % gcc-12 -c -mavx512vl -Wsign-conversion -Werror tu.c && echo "success"
> success
It warns with -O1.
