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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/99971] GCC generates partially vectorized and
 scalar code at once
Date: Thu, 15 Apr 2021 11:30:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99971

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #4)
> (In reply to andysem from comment #3)
> > I tried adding __restrict__ to the equivalents of x, y1 and y2 in the
> > original larger code base and it didn't help. The compiler (gcc 10.2) w=
ould
> > still generate the same half-vectorized code.
>=20
> Hmm, that's odd.  I suppose the equivalent of test() was inlined in the
> larger code base?
>=20
> I'd be interested in preprocessed source of a translation unit that exhib=
its
> this issue (and a pointer to the point in the source that is relevant).
>=20
> Note for GCC 12 I have a patch to improve things w/o requiring the use
> of __restrict (and I'm curious on whether that helps for the larger code
> base).

https://gcc.gnu.org/pipermail/gcc-patches/2021-April/567805.html

is the patch which applies to current master.=