Messages in this thread | | | From | "Joseph" <> | Subject | Re: Why does C3 CPU downgrade in kernel 2.4.20? | Date | Fri, 13 Dec 2002 14:55:04 +0800 |
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>>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
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