"Devang Patel" <[EMAIL PROTECTED]> wrote on 11/09/2006 07:30:17 PM:
> > Can these type casts (from uchar to schar and back) be cleaned away > > by some pass before vectorization, or do we need to teach the vectorizer > > to ignore such type casts? > > This was considered as tree-combiner's responsibility. However, I do not > know what is the current state and plan of tree-combiner pass. tree-combiner > pass, along with other combining activites, will remove unnecessary > cast (if possible). > so the stuff in tree-ssa-forwprop:eliminate_unnecessary_casts in autovect-branch is supposed to go under this tree-combiner pass as well, or do you plan to merge it to mainline some time? I could add this pattern to the vectorizer's idiom-recognition pass - it's like a tree-combiner I guess, except it's enabled from within the vectorizer (and looks only for patterns that can help the vectorizer), and doesn't change anything if the code doesn't end up getting vectorized. I imagine this should be only a temporary solution, cause this cleanup is potentially useful regardless of vectorization. dorit > - > Devang
