https://gcc.gnu.org/bugzilla/show_bug.cgi?id=35545
--- Comment #18 from Jan Hubicka <hubicka at ucw dot cz> --- > WE can try some internal benchmarks with this change too. That would be very welcome. Tracer used to be quite useful pass in old days, doing 1.6% on -O3+FDO SPECint (for 1.4% code size cost) that put it very close to the inliner (1.8%) that however needed 12.9% of code size. http://www.ucw.cz/~hubicka/papers/amd64/node4.html (see aggressive optimization table) I do not think it was ever resonably returned for GIMPLE. Martin, do you have any current scores? Part of benefits came from lack of global optimizers, but I think tail duplication has a potential in modern compiler, too. Perhaps we should try to do that and given that we now have tail merging pass, consider getting it useful without FDO, too. Honza
