------- Comment #22 from rakdver at kam dot mff dot cuni dot cz 2007-06-04 22:39 ------- 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? More precise view of code in loop optimizers. I cannot give any concrete example, but in principle this should not be bad and unless there are some serious reasons against it, I prefer to keep this cleanup there. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32183
