Predictive commoning miscompiles 482.sphinx3 in SPEC CPU 2006

[H. J. Lu]

On Fri, Jun 01, 2007 at 09:37:54AM -0700, H. J. Lu wrote:
> The predictive commoning patch:
> 
> http://gcc.gnu.org/ml/gcc-patches/2007-05/msg01061.html
> 
> miscompiles 482.sphinx3 in SPEC CPU 2006 with -O2 -ffast-math on
> Linux/x86-64.  Zdenek, do you have any ideas?
> 

Something is wrong. Predictive commoning is supposed to be turned
on at -O3. But it definitely afffects -O2. Why?


H.J.