[Bug tree-optimization/56125] -O2 -ffast-math generates bad code when dividing a double by the square of another double.

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56125



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



           What    |Removed                     |Added

----------------------------------------------------------------------------

           Keywords|                            |wrong-code

             Status|UNCONFIRMED                 |NEW

   Last reconfirmed|                            |2013-01-28

          Component|c                           |tree-optimization

     Ever Confirmed|0                           |1



--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> 2013-01-28 07:23:24 
UTC ---

It is turned to x*pow(n,-2.) and the expansion of pow notices that 2*2 is an

integer and uses the code meant for 2.5...