[Bug tree-optimization/80928] SLP vectorization does not handle induction in outer loop vectorization

["ro at CeBiTec dot Uni-Bielefeld.DE" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80928

--- Comment #19 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #18 from rguenther at suse dot de <rguenther at suse dot de> ---
[...]
> I have not yet built a native i686 compiler with 64bit support but only
> tried a x86_64 -> i686 cross with 64bit support where it doesn't
> reproduce.
>
> Native builds for i686 on a x86_64 host are always a bit odd to produce.

Indeed, probably worth documenting the procedure somewhere.  I believe
what you need is to configure with

* CC='gcc -m32' 'CXX='g++ -m32'

* --enable-targets=all

* --build=i686-pc-linux-gnu --host=i686-pc-linux-gnu --target=i686-pc-linux-gnu

  so configure doesn't conclude it's a cross

* using 32-bit gas and gld helps, but isn't required, I believe (it gets
  a few assembler configure tests wrong where the 32-bit and 64-bit
  results differ)

However, it's easier than having to have a separate machine with a
32-bit kernel around (if such beasts still exist)...

        Rainer