]> nv-tegra.nvidia Code Review - linux-2.6.git/commit
[PATCH] x86_64: prefetchw() can fall back to prefetch() if !3DNOW
authorEric Dumazet <dada1@cosmosbay.com>
Tue, 6 Sep 2005 22:16:17 +0000 (15:16 -0700)
committerLinus Torvalds <torvalds@g5.osdl.org>
Wed, 7 Sep 2005 23:57:15 +0000 (16:57 -0700)
commit19aaabb5841439988fc357f90d5c59d28fa84658
tree928d0b695a7c27a61ef7b93549a50014374bf4fe
parentc078d3266e58a3edd698b9f143f78fc585679031
[PATCH] x86_64: prefetchw() can fall back to prefetch() if !3DNOW

This is a multi-part message in MIME format.  If the cpu lacks 3DNOW
feature, we can use a normal prefetcht0 instruction instead of NOP5.
"prefetchw (%rxx)" and "prefetcht0 (%rxx)" have the same length, ranging
from 3 to 5 bytes depending on the register.  So this patch even helps
AMD64, shortening the length of the code.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Acked-by: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
include/asm-x86_64/processor.h