Re: linux 2.1.117 built with egcs-1.1 19980823

[Andi Kleen <ak at muc dot de>]

In article <9940.903928240@hurl.cygnus.com>,
Jeffrey A Law <law@cygnus.com> writes:
>   In message <k2hfz3iaeb.fsf@zero.aec.at>you write:
>> In article <Pine.GSO.3.96.980823205649.9780B-100000@chateau.georgiatech-met
z.fr> ,
>> damon LOVE <dlove@georgiatech-metz.fr> writes:
>> > Using egcs-2.91.54 19980823 (gcc2 ss-980609 experimental)
>> > I was able to build linux kernel 2.1.117 on a redhat 5.1
>> > machine... (amd k6 233)
>> 
>> I did the same, but noticed a 50k increase of the image compared to
>> the same tree build with gcc 2.7.2.3. I'm not sure about the reasons
>> yet.
>> 
>> 
>> 2.7.2.3 options: -O2 -m486 -fno-strength-reduce -malign-loops=2 
>> -malign-functions=2 -malign-jumps=2 -fomit-frame-pointer
>> egcs options:	-O2 -mpentiumpro -fno-strength-reduce -fomit-frame-poin
> Could be alignment related.  egcs aligns code according to intel's
> recommendations, which may (or may not) account for some increase.

Alignment explains about 4k (tested by using the same -malign-* options 
like with 2.7.2)

-m486 vs -mpentiumpro makes no difference (???)

> Presumably you are comparing text sizes and not being confused by
> other stuff like debug symbols, minimal symbol tables, etc.

Yes.

-Andi