[Bug middle-end/99407] s243 benchmark of TSVC is vectorized by clang and not by gcc

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99407

--- Comment #1 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Here we get:
s243.c:27:18: missed:   not vectorized, possible dependence between data-refs
a[i_29] and a[_9]
s243.c:26:27: missed:  bad data dependence.
s243.c:26:27: note:  ***** Analysis failed with vector mode V8QI

  <bb 6> [local count: 1052266997]:

  <bb 3> [local count: 1063004410]:
  # i_29 = PHI <_9(6), 0(4)>
  # ivtmp_43 = PHI <ivtmp_42(6), 31999(4)>
  _1 = b[i_29];
  _2 = c[i_29];
  _3 = d[i_29];
  _4 = _2 * _3;
  _5 = _1 + _4;
  a[i_29] = _5;
  _6 = e[i_29];
  _7 = _3 * _6;
  _8 = _5 + _7;
  b[i_29] = _8;
  _9 = i_29 + 1;
  _10 = a[_9];
  _11 = _3 * _10;
  _12 = _8 + _11;
  a[i_29] = _12;
  ivtmp_42 = ivtmp_43 - 1;
  if (ivtmp_42 != 0)
    goto <bb 6>; [98.99%]
  else
    goto <bb 5>; [1.01%]