* Steven Rostedt <rostedt@xxxxxxxxxxx> wrote: > On Sat, 2013-01-26 at 11:43 -0800, Linus Torvalds wrote: > > > The problem, of course, is that most -O2 code generation is done > > assuming hot loops that don't show much if any I$ issues. And the -Os > > thing is done *purely* for size, not taking any performance into > > account at all. There's no balanced middle ground, which is what _we_ > > would want. > > Gcc needs to implement a -Olinus What we really want is a sane default for 'library code' optimization: - cache-cold optimizations for run-through-once non-looping code (-Os) - good loop optimizations for anything that arguably loops (-O2) - plus common-sense fixes to -Os like not throwing away explicit branch hints we go to great pains to insert. Possibly some time this decade. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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