[Bug tree-optimization/46785] Doesn't vectorize reduction x += y*y

[irar at il dot ibm.com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46785

Ira Rosen <irar at il dot ibm.com> changed:

           What    |Removed                     |Added
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                 CC|                            |irar at il dot ibm.com

--- Comment #2 from Ira Rosen <irar at il dot ibm.com> 2010-12-05 08:31:38 UTC ---

> As we want to allow internal defs we can also just let calls slip through
> here (so we vectorize reductions with veclib vectorized calls as well).

Right.

(In reply to comment #1)
> Btw, I wonder why we bother to check the defs at all and not just do
> 
>      def1 && flow_bb_inside_loop_p (loop, gimple_bb (def1))
> 
> we should be able to handle all vectorizable reduction operands, and
> their vectorizability will be determined anyway.

This checks that the other def is not a reduction too.

Ira