[Bug middle-end/35545] virtual call specialization not happening with FDO

[law at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35545

Jeffrey A. Law <law at redhat dot com> changed:

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                 CC|                            |law at redhat dot com

--- Comment #6 from Jeffrey A. Law <law at redhat dot com> ---
You certainly don't want to put something between DOM and phi-only-cprop.  Jump
threading will tend to expose lots of degenerate PHIs.  phi-only-cprop
eliminates those degenerates.  We could have used the normal cprop code, but it
seemed too heavy-weight for the cleanups we wanted to do.

One could argue we want a phi-only-cprop cleanup after VRP since it threads
jumps too.