1 files changed, 39 insertions, 0 deletions
diff --git a/lib/utils/prefetch.h b/lib/utils/prefetch.h
new file mode 100644
index 000000000..66024e5ce
--- /dev/null
+++ b/lib/utils/prefetch.h
@@ -0,0 +1,39 @@
+/*
+* Prefetching Operations
+* (C) 2009 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_PREFETCH_H__
+#define BOTAN_PREFETCH_H__
+
+#include <botan/cpuid.h>
+
+namespace Botan {
+
+template<typename T>
+inline void prefetch_readonly(const T* addr, size_t length)
+   {
+#if defined(__GNUG__)
+   const size_t Ts_per_cache_line = CPUID::cache_line_size() / sizeof(T);
+
+   for(size_t i = 0; i <= length; i += Ts_per_cache_line)
+      __builtin_prefetch(addr + i, 0);
+#endif
+   }
+
+template<typename T>
+inline void prefetch_readwrite(const T* addr, size_t length)
+   {
+#if defined(__GNUG__)
+   const size_t Ts_per_cache_line = CPUID::cache_line_size() / sizeof(T);
+
+   for(size_t i = 0; i <= length; i += Ts_per_cache_line)
+      __builtin_prefetch(addr + i, 1);
+#endif
+   }
+
+}
+
+#endif