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Re: [gomp4 simd, RFC] Simple fix to override vectorization cost estimation.

>> > I propose the following, yet SLP have to use a NULL as a loop info
>> > which looks somewhat hacky.
>> I think this is overengineering.  -fvect-cost-model will do as
>> workaround.  And -fsimd-vect-cost-model has what I consider
>> duplicate - "simd" and "vect".
> I think it is a good idea, though I agree about s/simd-vect/simd/ and
> I'd use VECT_COST_MODEL_DEFAULT as the default, which would mean
> just use -fvect-cost-model.

that's ok, since we'd have a way to force those 'simd' loops.

>> > @@ -2929,6 +2929,11 @@ vect_estimate_min_profitable_iters
>> > (loop_vec_info loop_vinfo,
>> >    /* vector version will never be profitable.  */
>> >    else
>> >      {
>> > +      if (LOOP_VINFO_LOOP (loop_vinfo)->force_vect)
>> > +        {
>> > +          pedwarn (vect_location, 0, "Vectorization did not happen
>> > for the loop");
>> > +        }
> pedwarn isn't really desirable for this, you want just warning,
> but some warning you can actually also turn off.
> -Wopenmp-simd (and we'd use it also when we ignore #pragma omp declare simd
> because it wasn't useful/desirable).

consider a user is interested in enabling warning-as-error for this case?
can we disable the pedwarn the same way?


>         Jakub

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