http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46639
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Keywords| |missed-optimization
Last reconfirmed| |2010.11.24 12:18:23
CC| |hubicka at gcc dot gnu.org
Ever Confirmed|0 |1
Target Milestone|--- |4.6.0
--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-24
12:18:23 UTC ---
Hm, confirmed. We don't clean up redundant conditionals before function
splitting:
if (n_3(D) > 1023)
goto <bb 9>;
else
goto <bb 3>;
if (n_3(D) > 1023)
goto <bb 4>;
else
goto <bb 7>;
and fnsplit considers splitting after the first one to be most beneficial.
And we don't inline it back together because
Not inlining into bar:--param large-stack-frame-growth limit reached.
even though the original stack frame size is zero.
We didn't make the call in main direct either (ipa-reference runs too late
for that).
In the end this of course asks for more early optimizations.
