[Bug tree-optimization/16107] New: missed optimization with some math function builtins

[Bug tree-optimization/16107] New: missed optimization with some math function builtins

[pinskia at gcc dot gnu dot org]

Even after my tree combine pass, there are some math function builtins which I still not simplify 
because I do not regimplify calls expression yet.  I will handle this case after I sumbit and commit my 
tree-combiner.
double t(double x)
{
 x = -x;
 x = cos (x);
 return x;
}
double t1(double x)
{
 x = cos (-x);
 return x;
}

-- 
           Summary: missed optimization with some math function builtins
           Product: gcc
           Version: 3.5.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P2
         Component: tree-optimization
        AssignedTo: pinskia at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
 BugsThisDependsOn: 15459


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16107

[Bug tree-optimization/16107] missed optimization with some math function builtins

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-06-21 05:45 -------
Mine.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2004-06-21 05:45:41
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16107

[Bug tree-optimization/16107] missed optimization with some math function builtins

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-06-21 05:46 -------
I should note that cos(-x) == cos(x);

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16107

[Bug tree-optimization/16107] missed optimization with some math function builtins

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-08-29 19:36 -------
The two FIXMEs in my tree combiner:
  /* FIXME: do not abort for the call case as this can happen for an example
     -cos(-a) == cos (a) but this does not show up here as we reject it when
     calculating the size.  */
    /* If we have more than three or zero, we cannot handle this case so we
       return a relatively huge count saying we cannot handle it.
       FIXME: Handle the cost of a call expression.  */

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16107

[Bug tree-optimization/16107] missed optimization with some math function builtins

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-07-12 21:25 -------
It might be a while for me to rewrite the tree combiner so unassigning for now.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|pinskia at gcc dot gnu dot  |unassigned at gcc dot gnu
                   |org                         |dot org
             Status|ASSIGNED                    |NEW


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16107