tree 928d0b695a7c27a61ef7b93549a50014374bf4fe
parent c078d3266e58a3edd698b9f143f78fc585679031
author Eric Dumazet <[EMAIL PROTECTED]> Wed, 07 Sep 2005 05:16:17 -0700
committer Linus Torvalds <[EMAIL PROTECTED]> Thu, 08 Sep 2005 06:57:15 -0700

[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 <[EMAIL PROTECTED]>
Acked-by: Andi Kleen <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>

 include/asm-x86_64/processor.h |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/asm-x86_64/processor.h b/include/asm-x86_64/processor.h
--- a/include/asm-x86_64/processor.h
+++ b/include/asm-x86_64/processor.h
@@ -398,7 +398,7 @@ static inline void prefetch(void *x) 
 static inline void prefetchw(void *x) 
-       alternative_input(ASM_NOP5,
+       alternative_input("prefetcht0 (%1)",
                          "prefetchw (%1)",
                          "r" (x));
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