[Bug rtl-optimization/117922] [15/16 Regression] fold-mem-offsets pass is slow and memory hungry because UD/UD chain usage and the RD df problem

[law at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117922

--- Comment #28 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Yea, I'm working through that patch.  It's non-trivial :-)