https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65837
--- Comment #28 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> ---
(In reply to chrbr from comment #27)
> >
> > Should be reproducible without LTO with
> >
> > int __attribute__((target("fpu=neon"))) main()
> > {
> > ...
> > }
> >
> > and compiling without -mfpu=neon.
> >
>
> note that #include "arm_neon.h" can't be preprocessed and that the builtins
> are not recognized without a global flag:
>
> "arm_neon.h:31:2: error: #error You must enable NEON instructions (e.g.
> -mfloat-abi=softfp -mfpu=neon) to use arm_neon.h"
>
> A further improvement for that might be to set the attribute for all the
> functions defines in neon.h and remove the #error check.
>
> e.g:
>
> __extension__ static __inline float32x2_t
> __attribute__ ((__always_inline__))
> __attribute__((target("fpu=neon")))
> vadd_f32 (float32x2_t __a, float32x2_t __b)
> {
> return (float32x2_t) __builtin_neon_vaddv2sf (__a, __b);
> }
>
> or use a #pragma target (("mfpu=neon")) region.
The #pragma is what I would expect.
