begin quote On Fri, 7 Nov 2003 06:11:04 +0100 "Meka[ni]" <[EMAIL PROTECTED]> wrote:
> Someone here said that -O2 and one more flag is much better than > -O3. The only difference between -O2 and -O3 is that -O3 = -O2 + > -finline-functions +-frename-registers. Which of those two flags makes > -O2 become better than -O3. I don't know how to use time when I don't > have a program to check it. I would be great to have something like > mozilla compiled in both ways and see what is faster, but my poor CPU > is only Celeron(Mendocino) 300A, and it's a lot faster for me to ask > on the list for advice then to compile mozilla only once (not to > mention another compile process). Thanx :o) > Well, this is an interesting issue and very varialbe one. Put it like this: In small applications (gzip, bzip2 ) that easily fit RAM and don't have many different functions, the function inline will make a boost, this is because the flow is lighter and simpler. In larger applications, povray , gnuchess, mozilla, openoffice, tuxracer, well, just about any non-small one, the function inlining will just pollute the L2 and L3 cache, making the applications slower. //Spider -- begin .signature This is a .signature virus! Please copy me into your .signature! See Microsoft KB Article Q265230 for more information. end
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