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* [Bug middle-end/23470] New: a*a (for floats) is not considered always postive
@ 2005-08-18 22:41 pinskia at gcc dot gnu dot org
  2005-08-31 16:07 ` [Bug middle-end/23470] " pinskia at gcc dot gnu dot org
  0 siblings, 1 reply; 2+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-08-18 22:41 UTC (permalink / raw)
  To: gcc-bugs

While looking into PR 23452, I noticed this:
double pow(double, double);
int f(double a, double b)
{
  if (((a*a) + (b*b))<0)
    link_error();
}

There should be no reference to link_error as a*a is always postive.  Note really 
__builtin_pow (a, 2.0e+0) is what is folded to first.

-- 
           Summary: a*a (for floats) is not considered always postive
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P2
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23470


^ permalink raw reply	[flat|nested] 2+ messages in thread
* [Bug middle-end/23470] a*a (for floats) is not considered always postive
  2005-08-18 22:41 [Bug middle-end/23470] New: a*a (for floats) is not considered always postive pinskia at gcc dot gnu dot org
@ 2005-08-31 16:07 ` pinskia at gcc dot gnu dot org
  0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-08-31 16:07 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From pinskia at gcc dot gnu dot org  2005-08-31 16:05 -------
Confirmed.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2005-08-31 16:05:03
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23470


^ permalink raw reply	[flat|nested] 2+ messages in thread
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2005-08-18 22:41 [Bug middle-end/23470] New: a*a (for floats) is not considered always postive pinskia at gcc dot gnu dot org
2005-08-31 16:07 ` [Bug middle-end/23470] " pinskia at gcc dot gnu dot org

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