http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54939
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Blocks| |37021
AssignedTo|unassigned at gcc dot |rguenth at gcc dot gnu.org
|gnu.org |
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> 2013-03-27
11:19:49 UTC ---
Confirmed. GCC vectorizes this using hybrid SLP - it unrolls the loop once
to be able to vectorize two minus and two adds resulting from the complex
multiplication.
The PR is kind-of a duplicate of PR37021 where also a reduction and
a variable stride is involved. So fixing this bug is required to more
efficiently vectorize PR37021.
Note that even this bug has multiple issues that need to be tackled.
I happen to work on them.
