[Bug rtl-optimization/91154] [10 Regression] 456.hmmer regression on Haswell caused by r272922

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91154

--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> ---
Testcase for the loop in question:

void foo (int *dc, int *mc, int *tpdd, int *tpmd, int M)
{
  int sc;
  int k;
  for (k = 1; k <= M; k++)
    {
      dc[k] = dc[k-1] + tpdd[k-1];
      if ((sc = mc[k-1] + tpmd[k-1]) > dc[k]) dc[k] = sc;
      if (dc[k] < -987654321) dc[k] = -987654321;
    }
}