X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fcompiler.h;fp=lib%2Fcompiler.h;h=cfe90666017bf4aeed4ab04aabb8b1c5724292dc;hb=7d78f21c057ff50a823220d809ac38c3d907243c;hp=3b59813c9cab06370dfd5cccea5bcb997c37438f;hpb=8d25251929c8f325bed0fff24192d5a87034b32e;p=sliver-openvswitch.git

diff --git a/lib/compiler.h b/lib/compiler.h
index 3b59813c9..cfe906660 100644
--- a/lib/compiler.h
+++ b/lib/compiler.h
@@ -206,4 +206,18 @@
     static void f(void)
 #endif
 
+/* OVS_PREFETCH() can be used to instruct the CPU to fetch the cache
+ * line containing the given address to a CPU cache.
+ * OVS_PREFETCH_WRITE() should be used when the memory is going to be
+ * written to.  Depending on the target CPU, this can generate the same
+ * instruction as OVS_PREFETCH(), or bring the data into the cache in an
+ * exclusive state. */
+#if __GNUC__
+#define OVS_PREFETCH(addr) __builtin_prefetch((addr))
+#define OVS_PREFETCH_WRITE(addr) __builtin_prefetch((addr), 1)
+#else
+#define OVS_PREFETCH(addr)
+#define OVS_PREFETCH_WRITE(addr)
+#endif
+
 #endif /* compiler.h */