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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/96109] gcc.dg/vect/slp-47.c etc. FAIL
Date: Wed, 08 Jul 2020 09:41:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96109

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
OK, it's indeed wrong which means we'd fall through the checks that prevent
SPARC from vectorizing here but then we'll create an unaligned access
anyway (because VMAT_STRIDED_SLP is too lazy to figure out appropriate
alignment).  We're also assuming element alignment there.

static double x[1024], y[1024];

void __attribute__((noipa))
foo ()
{
  for (int i =3D 0; i < 511; ++i)
    {
      x[2*i] =3D y[1022 - 2*i - 1];
      x[2*i+1] =3D y[1022 - 2*i];
    }
}

int main()
{
  for (int i =3D 0; i < 1024; ++i)
    x[i] =3D 0, y[i] =3D i;
  foo ();
  for (int i =3D 0; i < 1022; ++i)
    if (x[i] !=3D y[1022 - (i^1)])
      __builtin_abort ();
  if (x[1022] !=3D 0 || x[1023] !=3D 0)
    __builtin_abort ();
  return 0;
}=