[Bug tree-optimization/32183] [4.3 Regression] reassoc2 can more extra calculations into a loop

[hjl at lucon dot org]

------- Comment #21 from hjl at lucon dot org  2007-06-04 22:19 -------
(In reply to comment #20)
> Subject: Re:  [4.3 Regression] reassoc2 can more extra calculations into a loop
> 
> > Can anyone show that the newly added dce_loop anything useful?
> 
> Yes, predictive commoning does not work as well if there is dead code
> (which is why it was added.
> 

But predictive commoning isn't enabled at -O2, why add it for -O2? What does
it give us at -O2?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32183