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From: "tschwinge at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/115304] gcc.dg/vect/slp-gap-1.c FAILs
Date: Mon, 03 Jun 2024 10:13:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115304

--- Comment #5 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
Created attachment 58333
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D58333&action=3Dedit
'c2' GCN target ('-march=3Dgfx908') 'slp-gap-1.c.179t.vect'

(In reply to ro@CeBiTec.Uni-Bielefeld.DE from comment #3)
> > --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
> > It should only need vect32 - basically I assumed the target can compose=
 the
> > 64bit vector from two 32bit elements.  But it might be that for this to=
 work
> > the loads would need to be aligned.
> >
> > What is needed is char-to-short unpacking and vector composition.  Eith=
er
> > composing V2SImode or V8QImode from two V4QImode vectors.
> >
> > Does the following help?
>=20
> Unfortunately not: makes no difference AFAICS.

Also doesn't resolve the issue for GCN target (tested '-march=3Dgfx908'); s=
ee
attached 'c2' GCN target ('-march=3Dgfx908') 'slp-gap-1.c.179t.vect'.=