Re: MOVNTQ on Athlon
From: Robert Redelmeier (redelm_at_ev1.net.invalid)
Date: 05/31/04
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Date: Mon, 31 May 2004 02:44:04 +0000 (UTC)
CHK <b@b.biz> wrote:
> This code also runs on dual Athlon MP system, but looks like the Athlon is
> choking on this instruction. MOVNTQ takes lot more cycles on Athlon compared
> to Pentium-III. In fact I get better speed on Athlon when I use MOVQ.
Odd. I use `movntq` on Althon and get good speed.
Of course, you only use it for writes, not reads. Reads need
the cache. With writes, you want to avoid the needless line
load before modify iff your going to modify the complete line.
-- Robert
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