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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/115640] GCN: FAIL: gfortran.dg/vect/pr115528.f   -O 
 execution test
Date: Tue, 25 Jun 2024 13:08:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115640

--- Comment #4 from rguenther at suse dot de <rguenther at suse dot de> ---
On Tue, 25 Jun 2024, ams at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115640
>=20
> --- Comment #3 from Andrew Stubbs <ams at gcc dot gnu.org> ---
> (In reply to Richard Biener from comment #2)
> > If you force GCN to use fixed length vectors (how?), does it work?  How=
's
> > it behaving on aarch64 with SVE?  (the CI was happy, but maybe doesn't
> > enable SVE)
>=20
> I believe "--param vect-partial-vector-usage=3D0" will disable the use of
> WHILE_ULT? The default is "2" for the standalone toolchain, and last I ch=
ecked
> the value is inherited from the host in the offload toolchain; the defaul=
t for
> x86_64 was "1", meaning approximately "only use partial vectors in epilog=
ue
> loops".

For unknown reasons x86-64 refuses to use partial vectors.=