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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/98854] [11 Regression] cray benchmark is
 about 15% slower since r11-4428-g4a369d199bf2f34e
Date: Wed, 27 Jan 2021 14:45:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98854

--- Comment #6 from rguenther at suse dot de <rguenther at suse dot de> ---
On Wed, 27 Jan 2021, marxin at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98854
>=20
> --- Comment #5 from Martin Li?ka <marxin at gcc dot gnu.org> ---
> (In reply to Richard Biener from comment #4)
> > Little bit convoluted testcase:
> >=20
> > double a[1024];
> >=20
> > int bar();
> > void foo (int n)
> > {
> >   double x =3D 0, y =3D 0;
> >   int i =3D 1023;
> >   do
> >     {
> >       x +=3D a[i] + a[i+1];
> >       y +=3D a[i] / a[i+1];
> >       if (bar ())
> >         break;
> >     }
> >   while (--i);
> >   a[0] =3D x;
> >   a[1] =3D y;
> > }
> >=20
>=20
> What compiler (ISA options) do you use in order to vectorize this?

I used -O3 but -O2 -ftree-slp-vectorize also vectorizes it.=