[Bug tree-optimization/43432] Missed vectorization: "complicated access pattern" for increasing and decreasing data indexing

["egallager at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43432

Eric Gallager <egallager at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2018-06-11
     Ever confirmed|0                           |1

--- Comment #5 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #4)
> (In reply to Michael Matz from comment #3)
> > Subject: Bug 43432
> > 
> > Author: matz
> > Date: Fri Sep 17 13:26:43 2010
> > New Revision: 164367
> > 
> > URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=164367
> > Log:
> > 	PR tree-optimization/43432
> > 	* tree-vect-data-refs.c (vect_analyze_data_ref_access):
> > 	Accept backwards consecutive accesses.
> > 	(vect_create_data_ref_ptr): If step is negative generate
> > 	decreasing IVs.
> > 	* tree-vect-stmts.c (vectorizable_store): Reject negative steps.
> > 	(perm_mask_for_reverse, reverse_vec_elements): New functions.
> > 	(vectorizable_load): Handle loads with negative steps when easily
> > 	possible.
> > 
> > testsuite/
> > 	PR tree-optimization/43432
> > 	* lib/target-supports.exp (check_effective_target_vect_perm_byte,
> > 	check_effective_target_vect_perm_short): New predicates.
> > 	(check_effective_target_vect_perm): Include x86_64.
> > 	* gcc.dg/vect/pr43432.c: New test.
> > 	* gcc.dg/vect/vect-114.c: Adjust.
> > 	* gcc.dg/vect/vect-15.c: Ditto.
> > 	* gcc.dg/vect/slp-perm-8.c: Use new predicate.
> > 	* gcc.dg/vect/slp-perm-9.c: Ditto.
> > 
> > Added:
> >     trunk/gcc/testsuite/gcc.dg/vect/pr43432.c
> > Modified:
> >     trunk/gcc/ChangeLog
> >     trunk/gcc/testsuite/ChangeLog
> >     trunk/gcc/testsuite/gcc.dg/vect/slp-perm-8.c
> >     trunk/gcc/testsuite/gcc.dg/vect/slp-perm-9.c
> >     trunk/gcc/testsuite/gcc.dg/vect/vect-114.c
> >     trunk/gcc/testsuite/gcc.dg/vect/vect-15.c
> >     trunk/gcc/testsuite/lib/target-supports.exp
> >     trunk/gcc/tree-vect-data-refs.c
> >     trunk/gcc/tree-vect-stmts.c
> 
> Did this fix it?

Putting in WAITING on a reply