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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/99395] s116 benchmark of TSVC is vectorized by clang
 and not by gcc
Date: Thu, 04 Mar 2021 23:24:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99395

--- Comment #1 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Loop is:

real_t s116 (struct args_t * func_args)
{
  int i;
  int nl;
  static const char __func__[5] =3D "s116";
  struct timeval * _1;
  int _2;
  float _3;
  float _4;
  float _5;
  int _6;
  float _7;
  float _8;
  float _9;
  int _10;
  float _11;
  float _12;
  float _13;
  int _14;
  float _15;
  float _16;
  float _17;
  int _18;
  float _19;
  float _20;
  float _21;
  struct timeval * _22;
  real_t _33;
  unsigned int ivtmp_43;
  unsigned int ivtmp_44;
  unsigned int ivtmp_45;
  unsigned int ivtmp_46;

  <bb 2> [local count: 108459]:
  initialise_arrays (&__func__);
  _1 =3D &func_args_29(D)->t1;
  gettimeofday (_1, 0B);
  goto <bb 5>; [100.00%]

  <bb 8> [local count: 1052266996]:

  <bb 3> [local count: 1063004409]:
  # i_48 =3D PHI <_18(8), 0(5)>
  # ivtmp_46 =3D PHI <ivtmp_45(8), 6399(5)>
  _2 =3D i_48 + 1;
  _3 =3D a[_2];
  _4 =3D a[i_48];
  _5 =3D _3 * _4;
  a[i_48] =3D _5;
  _6 =3D i_48 + 2;
  _7 =3D a[_6];
  _8 =3D a[_2];
  _9 =3D _7 * _8;
  a[_2] =3D _9;
  _10 =3D i_48 + 3;
  _11 =3D a[_10];
  _12 =3D a[_6];
  _13 =3D _11 * _12;
  a[_6] =3D _13;
  _14 =3D i_48 + 4;
  _15 =3D a[_14];
  _16 =3D a[_10];
  _17 =3D _15 * _16;
  a[_10] =3D _17;
  _18 =3D i_48 + 5;
  _19 =3D a[_18];
  _20 =3D a[_14];
  _21 =3D _19 * _20;
  a[_14] =3D _21;
  ivtmp_45 =3D ivtmp_46 - 1;
  if (ivtmp_45 !=3D 0)
    goto <bb 8>; [98.99%]
  else
    goto <bb 4>; [1.01%]


tsvc.c:275:18: missed:   not vectorized, possible dependence between data-r=
efs
a[i_48] and a[_18]
tsvc.c:274:27: missed:  bad data dependence.

_18 =3D i_48 + 5 and stride is 5...=