[PATCH 1/5] omp-low: introduce omplow_simd_context

[Alexander Monakov]

On Wed, 18 Jan 2017, Jakub Jelinek wrote:
> > +/* This structure is part of the interface between lower_rec_simd_input_clauses
> > +   and lower_rec_input_clauses.  */
> > +
> > +struct omplow_simd_context {
> > +  tree idx;
> > +  tree lane;
> > +  int max_vf;
> > +  bool is_simt;
> 
> Any reason ivar and lvar weren't added there too?

Yes, they are not part of 'persistently live context' between the two functions.
ivar and lvar are built from scratch in the callee, and immediately used only
once in the caller.

> > +  int &max_vf = sctx->max_vf;
> >    if (max_vf == 0)
> >      {
> > -      if (omp_find_clause (gimple_omp_for_clauses (ctx->stmt),
> > -			   OMP_CLAUSE__SIMT_))
> > -	max_vf = omp_max_simt_vf ();
> > -      else
> > -	max_vf = omp_max_vf ();
> > +      max_vf = sctx->is_simt ? omp_max_simt_vf () : omp_max_vf ();
> 
> I think it would be better just to use sctx->max_vf instead of max_vf,
> without the reference.

There are 5 more references to max_vf below; I've introduced the reference to
keep the patch smaller, but I think it improves readability too.  But I won't
mind changing it to sctx->max_vf everywhere.

Alexander