[Bug bootstrap/52391] [4.7 regression] genattrtab almost 5X slower for m68k than in 4.6 and earlier releases

[steven at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52391

--- Comment #10 from Steven Bosscher <steven at gcc dot gnu.org> 2012-02-28 
09:00:21 UTC ---
F, that backtrace was due to an error in the patch I had to look at what
simplify_and_tree was doing.

genattrtab is trying to simplify huge and-trees, mostly for m68k_sched_* symbol
refs.