http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35545
--- Comment #10 from Jan Hubicka <hubicka at ucw dot cz> --- > Tracer depends on the usual estimate_num_insns limits > (it is 12 years since I wrote it, so what I recall) note that one impotant thing that changed in those 12 years is that I originally carefuly tuned tracer in combination with crossjumping. Tracer produced duplicates and if no pass managed to take use of them, crossjumping cleaned them up pre-reload. Trace formation in bb-reorder re-instantiated duplicated when it seemed sensible for code layout. This broke, since SSA makes RTL cross jumping quite useless and it is now done after reg-alloc only. We never really got working code unification pass on gimple. http://www.ucw.cz/~hubicka/papers/amd64/node4.html Claims that at that time I got 1.6% speedup on SPECint with profile feedback 1.43% code growth. That is not bad, but wonder to what it translates today. Honza
