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From: "stammark at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/96974] [10/11 Regression] ICE in
 vect_get_vector_types_for_stmt compiling for SVE
Date: Mon, 18 Jan 2021 13:52:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96974

--- Comment #7 from Stam Markianos-Wright <stammark at gcc dot gnu.org> ---
(In reply to rsandifo@gcc.gnu.org from comment #6)
> (In reply to Stam Markianos-Wright from comment #5)
> > I'm tempted to try and add a reverse:
> >=20
> > 	|| multiple_p (*stmt_vectype_out, nunits_vectype)
> >=20
> > And then regtest, but I probably need to do more reading around to figu=
re out
> > what we really should be expecting each case!
> I don't think that's right.  If nunits_vectype is not a multiple
> of stmt_vectype then the stmt_vectype contains (or might contain)
> unused elements.  The vectoriser isn't set up to work like that:
> all operations are currently supposed to be full-vector operations
> (possibly predicated, on SVE and AVX).
>=20
> AFAICT the assert is correct and it's showing up a problem elsewhere.

Cool, thank you for the info and the confirmation! I will carry on
investigating to try and find the actual problem=