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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/113678] SLP misses up vec_concat
Date: Tue, 06 Feb 2024 17:14:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113678

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Noticed the same with:
```
void f(unsigned char *a, unsigned char *b, unsigned char *c)
{
  unsigned char t[8];
  t[0] =3D a[0];
  t[1] =3D a[1];
  t[2] =3D a[2];
  t[3] =3D a[3];
  t[4] =3D b[0];
  t[5] =3D b[1];
  t[6] =3D b[2];
  t[7] =3D b[3];
  c[0] =3D t[0];
  c[1] =3D t[1];
  c[2] =3D t[2];
  c[3] =3D t[3];
  c[4] =3D t[4];
  c[5] =3D t[5];
  c[6] =3D t[6];
  c[7] =3D t[7];
}

```

Adding `-fno-tree-vectorize` gives the best code even.=