[Bug tree-optimization/56125] [4.7/4.8 Regression] -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

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

            Summary|-O2 -ffast-math generates   |[4.7/4.8 Regression] -O2

                   |bad code when dividing a    |-ffast-math generates bad

                   |double by the square of     |code when dividing a double

                   |another double.             |by the square of another

                   |                            |double.



--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> 2013-01-28 07:30:05 
UTC ---

4.6 generated a very suboptimal call to the libm pow function, but it didn't

have the completely wrong result.