From: Martin Mares <mj@ucw.cz>
Date: Sat, 3 Sep 2005 23:15:55 +0000 (+0000)
Subject: Prefetches in search/refs.c make much better sense now, so we can enable
X-Git-Tag: holmes-import~747
X-Git-Url: http://mj.ucw.cz/gitweb/?a=commitdiff_plain;h=fcb9afb9d6b5f51cc2265ce81e7a965acd6e0a38;p=libucw.git

Prefetches in search/refs.c make much better sense now, so we can enable
them even on P4, gaining about 20ms per query.
---

diff --git a/lib/prefetch.h b/lib/prefetch.h
index a0b045fb..8c97906d 100644
--- a/lib/prefetch.h
+++ b/lib/prefetch.h
@@ -11,7 +11,12 @@
 #define _UCW_PREFETCH_H
 
 #if defined(__pentium4)
-  /* Default prefetches are good enough */
+
+#define HAVE_PREFETCH
+static inline void prefetch(void *addr)
+{
+  asm volatile ("prefetcht0 %0" : : "m" (*(byte*)addr));
+}
 
 #elif defined(__k6)
   /* K6 doesn't have prefetches */