[Bug tree-optimization/64716] Missed vectorization in a hot code of SPEC2000 ammp

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64716

vekumar at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vekumar at gcc dot gnu.org

--- Comment #4 from vekumar at gcc dot gnu.org ---
Tried to see if there is improvement when allowing splitting the group stores
based at VF boundary.

Small improvement noted with slightly older trunk 
gcc version 7.0.0 20160524 (experimental) (GCC)

rectmm.c:520:2: note: Basic block will be vectorized using SLP


(Snip)
a1-> px = a1->x + lambda*a1->dx;
a1-> py = a1->y + lambda*a1->dy;
a1-> pz = a1->z + lambda*a1->dz;
(Snip)

---SLP dump---
rectmm.c:520:2: note: Detected interleaving load a1_944->xD.4701 and
a1_944->yD.4702
rectmm.c:520:2: note: Detected interleaving load a1_944->xD.4701 and
a1_944->zD.4703
rectmm.c:520:2: note: Detected interleaving load a1_944->xD.4701 and
a1_944->dxD.4721
rectmm.c:520:2: note: Detected interleaving load a1_944->xD.4701 and
a1_944->dyD.4722
rectmm.c:520:2: note: Detected interleaving load a1_944->xD.4701 and
a1_944->dzD.4723
rectmm.c:520:2: note: Detected interleaving store a1_944->pxD.4728 and
a1_944->pyD.4729
rectmm.c:520:2: note: Detected interleaving store a1_944->pxD.4728 and
a1_944->pzD.4730

rectmm.c:520:2: note: Split group into 2 and 1

rectmm.c:520:2: note: Basic block will be vectorized using SLP
rectmm.c:520:2: note: SLPing BB part
rectmm.c:520:2: note: ------>vectorizing SLP node starting from: # VUSE
<.MEM_1752>
_672 = a1_944->dxD.4721;
---SLP dump---