https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92301

--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
Simplified a bit more:

$ cat /tmp/vect.c
unsigned int m;

#define N 128
unsigned int a[N];

unsigned int
__attribute__((noipa))
df_count_refs (bool include_defs)
{
  int size = 0;

  for (unsigned int regno = 0; regno < m; regno++)
    if (include_defs)
      size += a[regno];
  return size;
}

int main(int argc, char **argv)
{
  for (unsigned i = 0; i < N; i++)
    a[i] = i;

  if (argc == 1)
    m = 17;

  unsigned int r = df_count_refs(true);
  __builtin_printf ("r: %d\n", r);
  if (r != 136)
    __builtin_abort ();

  return 0;
}

$ g++ /tmp/vect.c -march=haswell -O3 && ./a.out 
r: 17
Aborted (core dumped)

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