[Bug middle-end/64928] [4.8/4.9/5 Regression] Inordinate cpu time and memory usage in "phase opt and generate" with -ftest-coverage -fprofile-arcs

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64928

--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note that if we fix out-of-SSA coalescing (patch in testing) then RTL CSE
explodes via DF.