[Bug tree-optimization/106884] ifcombine may move shift so it shifts more than bitwidth

[kristerw at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106884

--- Comment #3 from Krister Walfridsson <kristerw at gcc dot gnu.org> ---
A similar case is

int r1, r2;

int foo(int a, int s1, int s2)
{
  if (a & (1 << s1))
    return r1;
  if (a & (1 << s2))
    return r1;
  return r2;
}

where reassoc2 optimizes this to always shift by s2.