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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/96133] [10/11 Regression] x86-64 gcc 10.1
 using -O3 leads to wrong calculation since r10-1882-g831e688af50c5f77
Date: Thu, 09 Jul 2020 12:18:30 +0000
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X-Bugzilla-Component: tree-optimization
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X-Bugzilla-Keywords: wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96133

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Interestingly it works for int[4] but fails for int[2].

typedef int T;
static const T a[2][3] =3D { { 1, 2, 3 }, { 4, 5, 6 } };
typedef T v2 __attribute__((vector_size(2*sizeof(T))));

int
main()
{
  const T *p =3D &a[0][2];
  v2 x =3D *(const v2 *)p;
  T z =3D x[1];
  if (z !=3D 4)
    __builtin_abort ();
  return 0;
}=