[Bug c/30858] ice for legal code with -O2 -ftree-vectorize

["dorit at il dot ibm dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #3 from dorit at il dot ibm dot com  2007-02-19 12:56 -------
(In reply to comment #0)

Thanks for exercising the vectorizer and reporting these bugs!

> On the wider issue of the quality of the vectorizer, I
> have thrown most of Suse Linux 10.3 at it and it has crashed
> in a few places.

only a few? :-)

> I suspect there would be considerable value at getting some
> other distribution [ Debian ?], maybe on another type of 
> machine [ PPC64 ?], and flushing out a few more bugs in the optimizer.
> You would need to ensure that -ftree-vectorize was switched
> on for every compile.
> Just a suggestion.

I agree. We are working on a cost model these days to make the vectorizer less
greedy, hopefully as a step towards enabling vectorization on by default -
which would help in flushing bugs out.

(Just as a side comment - FYI - most of the vectorizer bugs you opened so far
in the last few days (30771, 30795, 30843) are related to features that were
added *very* recently).


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30858