[Bug tree-optimization/89263] Simplify bool expression to OR

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89263

Marc Glisse <glisse at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2019-02-09
     Ever confirmed|0                           |1

--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> Basically we need to convert a != 0 ? true : b != 0

Actually, just a != 0 ? true : b, the second != 0 isn't there, the first one
exists only because GIMPLE_COND cannot have just a bool argument. Although we
actually see a != 0 ? a : b...

  <bb 2> [local count: 1073741824]:
  if (a_2(D) != 0)
    goto <bb 3>; [34.00%]
  else
    goto <bb 4>; [66.00%]

  <bb 3> [local count: 365072224]:

  <bb 4> [local count: 1073741824]:
  # _1 = PHI <b_3(D)(2), a_2(D)(3)>

needs to become

  _1 = a_2(D) | b_3(D);