On 2015.04.10 at 06:18 -0700, H. Peter Anvin wrote: > On 04/10/2015 05:50 AM, Denys Vlasenko wrote: > > > > However, I'm an -Os guy. Expect -O2 people to disagree :) > > > > The problem with -Os is that the compiler will make *any* tradeoffs to > save a byte. It is really designed to squeeze as much code into a > fixed-size chunk, e.g. a ROM, as possible. > > We have asked for an -Okernel mode from the gcc folks forever. It > basically would mean "-Os except when really dumb."
If you want the best of both worlds perhaps you should reconsider Andy's LTO patch? With -flto gcc automatically optimizes all functions that it considers cold for size. So you could expect some code size savings even with -O2 (or -O3). -- Markus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
