https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110649
Jan Hubicka <hubicka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=10647
Ever confirmed|0 |1
Last reconfirmed| |2023-07-14
Status|UNCONFIRMED |NEW
--- Comment #3 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Thanks for bisecting this! We also have PR10647 which is tracked to this
change.
The change correct loop profile after header copying:
test()
{
for (int i = 0; i < 10; i++)
test2();
}
has probability of exit conditional 90.9% before loop header copying (since it
technically iterates 10 times) while after loop header copying and optimizing
out the constant "if (0<10)" test it has only 90% loopback probability.
So probably fixing the bug above triggers something else.
I will first look at PR10647 and see if I can figure out what is going on
there.
