Date: Sat, 28 Nov 1998 12:27:34 +0100 (CET) From: Jakub Jelinek <jj@sunsite.ms.mff.cuni.cz> To: wes@softweyr.com (Wes Peters) Cc: grog@lemis.com, paipai@tin.it, freebsd-sparc@FreeBSD.ORG Subject: Re: [Ultra] Compiler, again Message-ID: <199811281127.MAA06491@sunsite.mff.cuni.cz> In-Reply-To: <365FA073.BD5F78AF@softweyr.com> from "Wes Peters" at Nov 28, 98 00:04:19 am
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> Also, GCC code for 64-bit processors is better optimized when compiled
> on a 64-bit system. IIRC, the 64-bit hosts use larger window sizes
> for register scheduling and peephole optimization.
(btw: the most visible difference is usually in constant formation and stuff
like that).
There is a nifty trick how to overcome this :))
-DHOST_WIDE_INT="unsigned long long" -DHOST_BITS_PER_WIDE_INT=64
and you won't see the difference.
Anyway, I'd suggest you to work on the compiler first before you start
working with it, as egcs-current is currently broken towards sparc64, egcs
from some months ago might do the job for kernel only (and you won't
be able to compile e.g. libc), egcs 1.1 nor 1.0 won't work for sparc64 at
all, gcc 2.8* is even worse (but it is a dead project anyway), gcc 2.7* +
patches might again, compile several things, but is completely incompatible
with SPARCv9 ABI, which is a major drawback.
So, if you really want to start with a port, I'd suggest a couple of your
people go and help with the compiler, that will help all sparc64 ports...
Cheers,
Jakub
___________________________________________________________________
Jakub Jelinek | jj@sunsite.mff.cuni.cz | http://sunsite.mff.cuni.cz
Administrator of SunSITE Czech Republic, MFF, Charles University
___________________________________________________________________
UltraLinux hacker | http://ultra.linux.cz | UltraPenguin maintainer
Linux version 2.1.129 on a sparc64 machine (3958.37 BogoMips)
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