opened a missed optimization PR so that I won't forget about it - PR29160 dorit
> "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 >
