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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/98544] [11 regression] Wrong code generated
 by tree vectorizer since r11-3917-g28290cb50c7dbf87
Date: Fri, 08 Jan 2021 12:14:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98544

--- Comment #17 from Richard Biener <rguenth at gcc dot gnu.org> ---
/* { dg-do run } */

double a[4], b[2];

void __attribute__((noipa))
foo ()
{
  double a0 =3D a[0];
  double a1 =3D a[1];
  double a2 =3D a[2];
  double a3 =3D a[3];
  b[0] =3D a1 - a3;
  b[1] =3D a0 + a2;
}

int main()
{
  a[0] =3D 1.;
  a[1] =3D 2.;
  a[2] =3D 3.;
  a[3] =3D 4.;
  foo ();
  if (b[0] !=3D -2 || b[1] !=3D 4)
    __builtin_abort ();
  return 0;
}=