Re: Why does C3 CPU downgrade in kernel 2.4.20?

From: Juan Quintela (
Date: Tue Dec 10 2002 - 07:40:56 EST

>>>>> "daniel" == Daniel Egger <> writes:

daniel> Am Die, 2002-12-10 um 06.52 schrieb Dave Jones:
>> I believe someone (Jeff Garzik?) benchmarked gcc code generation,
>> and the C3 executed code scheduled for a 486 faster than it did for
>> -m586
>> I'm not sure about the alignment flags. I've been meaning to look
>> into that myself...

daniel> Interesting. I have no clue about which C3 you're talking about here but
daniel> a VIA Ezra has all 686 instructions including cmov and thus optimising
daniel> for PPro works best for me.

Have you tested it?

Here, we got cmov to work if the two operands are registers, if any of
the operands is in memory, it don't work.

Been there, been burned :p

Later, Juan.

In theory, practice and theory are the same, but in practice they 
are different -- Larry McVoy
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