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From: "marxin at gcc dot gnu.org" <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 14:39:33 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98854

--- Comment #5 from Martin Li=C5=A1ka <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

What compiler (ISA options) do you use in order to vectorize this?=