[Bug ipa/83178] [8 regression] g++.dg/ipa/devirt-22.C fail

[jamborm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83178

--- Comment #7 from Martin Jambor <jamborm at gcc dot gnu.org> ---
We create an additional clone because the edge that brings the context
now satisfies maybe_hot_p and previously it didn't.  The reason is
that the caller (which is called sort) now has frequency
NODE_FREQUENCY_EXECUTED_ONCE whereas previously it was
NODE_FREQUENCY_UNLIKELY_EXECUTED.

sort in term is a static function called from an externally visible
update_sources with frequency NODE_FREQUENCY_NORMAL and looks like:

int *e;
void update_sources() {
  if (e) {
    C f;
    sort(f, b);
  }
}

I am not sure I understand why this should mean that sort is only
likely to be executed once but it does not seem to be any worse than
the previous value.  I'll prepare the patch adjusting the test.