On Wed, 27 Aug 2025, Jakub Jelinek wrote:
> On Wed, Aug 27, 2025 at 03:50:26PM +0200, Richard Biener wrote:
> > Ah, thanks for the write-up how to compute the number of uses.
> >
> > I'll test the following.
> > --- a/gcc/tree-vect-patterns.cc
> > +++ b/gcc/tree-vect-patterns.cc
> > @@ -4303,6 +4
On Wed, Aug 27, 2025 at 03:50:26PM +0200, Richard Biener wrote:
> Ah, thanks for the write-up how to compute the number of uses.
>
> I'll test the following.
> --- a/gcc/tree-vect-patterns.cc
> +++ b/gcc/tree-vect-patterns.cc
> @@ -4303,6 +4303,8 @@ vect_synth_mult_by_constant (vec_info *vinfo, tr
On Wed, 27 Aug 2025, Jakub Jelinek wrote:
> On Wed, Aug 27, 2025 at 02:48:33PM +0200, Richard Biener wrote:
> > I don't understand how synth-mult works, but it does introduce
> > multiple uses of a reduction variable which will ultimatively
> > fail vectorization (or ICE with a pending change). S
On Wed, Aug 27, 2025 at 02:48:33PM +0200, Richard Biener wrote:
> I don't understand how synth-mult works, but it does introduce
> multiple uses of a reduction variable which will ultimatively
> fail vectorization (or ICE with a pending change). So avoid
> applying the pattern. I've tried to do s
