From: "Joseph" <jospehchan@yahoo.com.tw>
To: "Dave Jones" <davej@codemonkey.org.uk>
Cc: "Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: Why does C3 CPU downgrade in kernel 2.4.20?
Date: Fri, 13 Dec 2002 14:55:04 +0800 [thread overview]
Message-ID: <004d01c2a274$915cf690$3716a8c0@taipei.via.com.tw> (raw)
In-Reply-To: <20021212133339.GE1145@suse.de>
>>On Thu, Dec 12, 2002 at 05:17:29PM +0800, Joseph wrote:
>> Thanks for all response. :)
>> I think I know more why it downgrades.
>> But one more curious question.
>> In the file, arch/i386/Makefile, under kernel 2.5.51.
>> I found the C3 alignments , $(call check_gcc, -march=c3,-march=i486).
>> Does the C3 CPU type be included in gcc compile option??
>> I've downloaded the latest gcc 3.2.1 version.
>> But I don't find the c3 options in the file gcc/config/i396/i386.c,
i386.h
>> or etc.
>Not in a currently released gcc. CVS HEAD supports it, as will 3.3
>Dave
I've checked the gcc CVS. But it seems to use i486 pluse MMX and 3DNOW
instructions.
* config.gcc: Treat winchip_c6-*|winchip2-*|c3-* as pentium-mmx.
* config/i386/i386.c (processor_alias_table): Add winchip-c6, winchip2 and
c3.
* doc/invoke.texi: Mention new aliases.
** {"c3", PROCESSOR_I486, PTA_MMX | PTA_3DNOW}, **
Is there any plan to optimize for C3 CPU in future gcc released version?
BR,
Joseph
-----------------------------------------------------------------
< 每天都 Yahoo!奇摩 > www.yahoo.com.tw
next prev parent reply other threads:[~2002-12-13 6:48 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-10 4:02 Joseph
2002-12-10 5:52 ` Dave Jones
2002-12-10 7:22 ` Daniel Egger
2002-12-10 7:24 ` Dave Jones
2002-12-10 7:53 ` Daniel Egger
2002-12-10 12:40 ` Juan Quintela
2002-12-10 15:40 ` Daniel Egger
2002-12-10 16:51 ` Alan Cox
2002-12-10 19:39 ` Daniel Egger
2002-12-10 20:17 ` Jeff Garzik
2002-12-10 21:24 ` Alan Cox
2002-12-11 18:51 ` Bill Davidsen
2002-12-11 19:14 ` Dave Jones
2002-12-11 19:42 ` Jeff Garzik
2002-12-11 19:51 ` Joel Jaeggli
2002-12-12 9:17 ` Joseph
2002-12-12 13:33 ` Dave Jones
2002-12-13 6:55 ` Joseph [this message]
2002-12-13 11:04 ` Daniel Egger
2002-12-13 11:57 ` Dave Jones
2002-12-11 21:00 ` Alan Cox
2002-12-12 10:19 ` P
2002-12-11 13:19 ` Denis Vlasenko
2002-12-11 10:58 ` Dave Jones
2002-12-11 19:09 ` Denis Vlasenko
2002-12-11 14:59 ` Dave Jones
2002-12-12 18:09 ` Pavel Machek
2002-12-14 16:46 ` Denis Vlasenko
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