[Bug rtl-optimization/42497] Generate conditional tail calls .

[ramana at gcc dot gnu dot org]

------- Comment #1 from ramana at gcc dot gnu dot org  2009-12-30 17:32 -------
The problem here essentially appears to be that GCC can't seem to generate
conditional tail-calls (or conditional calls for that matter in this case) with
-fno-optimize-sibling-calls . I don't read this as a problem with
builtin_expect per-se but that of GCC not being able to generate a conditional
tail-call / call.

A simpler test is essentially the following. 

void foo (int x)
{
  if (x)
    bar ();
  else
    baz ();
}


This is also not just a target problem but probably one for the RTL optimizers
rather any where else..


-- 

ramana at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement
             Status|UNCONFIRMED                 |NEW
          Component|target                      |rtl-optimization
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2009-12-30 17:32:59
               date|                            |
            Summary|GCC can do less work in the |Generate conditional tail
                   |frequently executed path    |calls .


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42497