[Bug tree-optimization/107090] [aarch64] sequence logic should be combined with mul and umulh

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107090

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2022-09-29
          Component|middle-end                  |tree-optimization
     Ever confirmed|0                           |1
                 CC|                            |pinskia at gcc dot gnu.org
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
A few issues.
First is:

  if (_26 != 0)
    goto <bb 3>; [50.00%]
  else
    goto <bb 4>; [50.00%]

  <bb 3> [local count: 536870913]:
  ht_15 = ht_13 + 4294967296;

  <bb 4> [local count: 1073741824]:
  # ht_2 = PHI <ht_13(2), ht_15(3)>

This should be done as:
tmp_ = _26 != 0
tmp1_ = (unsigned long) tmp_
tmp2_ = tmp1_ << 32;
ht_2 = ht_13 + tmp2_;

And then there is huge pattern matching with respect to doing widening multiple
here.