* intrinsics and sign-conversion
@ 2023-03-17 9:22 Mathieu Malaterre
2023-03-17 11:32 ` Jonathan Wakely
0 siblings, 1 reply; 3+ messages in thread
From: Mathieu Malaterre @ 2023-03-17 9:22 UTC (permalink / raw)
To: gcc-help
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
Thanks,
--
Mathieu
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: intrinsics and sign-conversion
2023-03-17 9:22 intrinsics and sign-conversion Mathieu Malaterre
@ 2023-03-17 11:32 ` Jonathan Wakely
2023-03-17 11:48 ` Mathieu Malaterre
0 siblings, 1 reply; 3+ messages in thread
From: Jonathan Wakely @ 2023-03-17 11:32 UTC (permalink / raw)
To: Mathieu Malaterre; +Cc: gcc-help
On Fri, 17 Mar 2023 at 09:23, Mathieu Malaterre via Gcc-help
<gcc-help@gcc.gnu.org> 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.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: intrinsics and sign-conversion
2023-03-17 11:32 ` Jonathan Wakely
@ 2023-03-17 11:48 ` Mathieu Malaterre
0 siblings, 0 replies; 3+ messages in thread
From: Mathieu Malaterre @ 2023-03-17 11:48 UTC (permalink / raw)
To: Jonathan Wakely; +Cc: gcc-help
On Fri, Mar 17, 2023 at 12:32 PM Jonathan Wakely <jwakely.gcc@gmail.com> wrote:
>
> On Fri, 17 Mar 2023 at 09:23, Mathieu Malaterre via Gcc-help
> <gcc-help@gcc.gnu.org> 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.
Thanks ! I keep forgetting about this :(
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109173
--
Mathieu
^ permalink raw reply [flat|nested] 3+ messages in thread
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