http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46939
Jan Hubicka <hubicka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2010.12.15 12:24:34
Ever Confirmed|0 |1
--- Comment #1 from Jan Hubicka <hubicka at gcc dot gnu.org> 2010-12-15
12:24:34 UTC ---
Predictions for bb 6
DS theory heuristics: 4.0%
first match heuristics (ignored): 4.0%
combined heuristics: 4.0%
negative return heuristics: 4.0%
So it is negative return heuristics.
Richi's profiling reorg broke statistics code, so I will need to dig into
archives before I fix it again. But last time I updated the tables the
heuristics was 96% right on SPEC. I am not terribly oposed in making it less
reliable with a comment explaining why. In SPEC it is most surely perfoming
heuristics, we have only few of them above 60%
The heuristics makes a guess that negative return values tends to be used to
return error stages. It is not true in this case.
