[Bug tree-optimization/42108] [4.4/4.5 Regression] Vectorizer cannot deal with PAREN_EXPR gracefully, 50% performance regression

[rguenther at suse dot de]

------- Comment #22 from rguenther at suse dot de  2009-11-30 10:13 -------
Subject: Re:  [4.4/4.5 Regression] Vectorizer
 cannot deal with PAREN_EXPR gracefully, 50% performance regression

On Mon, 30 Nov 2009, irar at il dot ibm dot com wrote:

> ------- Comment #20 from irar at il dot ibm dot com  2009-11-30 08:52 -------
> Actually, PAREN_EXPRs are vectorizable (the support was added by you, Richard,
> in your original PAREN_EXPR patch
> http://gcc.gnu.org/viewcvs?limit_changes=0&view=revision&revision=132515 )).

Oh, indeed ;)

> The problem here is that vectorizable_assignment does not support multiple
> types. The attached patch adds this support, but I don't know if the patch is
> suitable for the current stage...

Probably not (though it looks small).  If you feel confident about it
you may well apply it still though.

Thanks,
Richard.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42108