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[Bug tree-optimization/42108] [4.4/4.5 Regression] Vectorizer cannot deal with PAREN_EXPR gracefully, 50% performance regression
- From: "rguenther at suse dot de" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 30 Nov 2009 10:13:10 -0000
- Subject: [Bug tree-optimization/42108] [4.4/4.5 Regression] Vectorizer cannot deal with PAREN_EXPR gracefully, 50% performance regression
- References: <bug-42108-9410@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- 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.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42108