Jeff Garzik wrote:
> > Hmm.. I tried to compile the kernel with -Os (gcc 2.96-98) and I just got a
> > ~1% smaller vmlinux and a ~3% smaller bzImage. Maybe the size optimizations
> > doesn't show on these files? Internal data structures that are much bigger
> > than "real" code?
>
> That doesn't tell us much unless you benchmark any speed
> improvements/degradations noticed. Hidden in that 1% may be more
> favorable I-cache usage, better register usage... who knows.
>
> It would also be interesting to compile key files like kernel/sched.c or
> mm/vmscan.c in assembly using O2 and Os, and compare the output with
> diff -u.
It'd be good to know why it's not achieving the quoted 30% space saving
that other compilers manage for normal code, unless it's myth of course.
-- Jamie
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This archive was generated by hypermail 2b29 : Thu Jan 31 2002 - 21:00:41 EST