List Archive: gentoo-performance
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Koby Boy wrote:
> On Tue, 2003-05-06 at 03:24, eNTi wrote:
>>CFLAGS="-mcpu=athlon-xp -O3 -pipe -m3dnow -msse -mmmx -Wall -fomit-frame-pointer" / CHOST="i686-pc-linux-gnu"
> I've got an Athon-XP 2400 (2 GHz) but I've over clocked it to the
> equivalent of an Athlon-XP 2600 (2.2GHz). My CFLAGS look like this:
> CFLAGS="-mcpu=athlon-xp -march=athlon-xp -O3 -fforce-addr
> -fomit-frame-pointer -funroll-loops -frerun-cse-after-loop
> -frerun-loop-opt -falign-functions=4 -foptimize-sibling-calls
> -fexpensive-optimizations -pipe -m3dnow -mmmx -msse -mfpmath=sse,387"
-O3 implies -O2 which implies:
-mfpmath=sse,387 is still unstable.. asking for trouble!
Lastly, many people have expressed that -funroll-loops slows down more
code than it speeds up.
I'd be surprised if you see much improvement over '-O3 -pipe', in 99% of
apps, not worth it's time in debugging broken code :/
man gcc *g*
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