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From: "juzhe.zhong at rivai dot ai" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/99395] s116 benchmark of TSVC is vectorized
 by clang and not by gcc
Date: Wed, 31 Jan 2024 03:50:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99395

--- Comment #11 from JuzheZhong <juzhe.zhong at rivai dot ai> ---
It seems that we should fix this case (Richard gave) first which I think it=
's
not the SCEV or value-numbering issue:

double a[1024];
void foo ()
{
  for (int i =3D 0; i < 1022; i +=3D 2)
    {
      double tem =3D a[i+1];
      a[i] =3D tem * a[i];
      a[i+1] =3D a[i+2] * tem;
    }
}

auto.c:13:21: missed: couldn't vectorize loop
auto.c:15:14: missed: not vectorized: no vectype for stmt: tem_10 =3D a[_1];
 scalar_type: double=