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[Bug tree-optimization/36630] [4.3/4.4 Regression] ICE in vect_update_ivs_after_vectorizer
- From: "irar at il dot ibm dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 8 Sep 2008 07:44:54 -0000
- Subject: [Bug tree-optimization/36630] [4.3/4.4 Regression] ICE in vect_update_ivs_after_vectorizer
- References: <bug-36630-87@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #13 from irar at il dot ibm dot com 2008-09-08 07:44 -------
(In reply to comment #9)
> Subject: Re: [4.3/4.4 Regression] ICE in vect_update_ivs_after_vectorizer
>
> > Another thing, 4.4 does not vectorize this loop anymore (and, therefore, there
> > is no ICE), because of unknown number of iterations:
>
> I also have remarked on one of the graphite testcases scop-matmult.c
> that we had a regression in the precision of the number of iterations from
> last graphite merge till yesterday's merge, i.e. from 138275 to 139870
> We used to have a symbolic number of iterations, but now the result
> is scev_dont_know. I have not yet tracked this down to the patch that
> produced this regression.
>
> Sebastian
>
I opened pr37416 for this issue.
Ira
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36630