propagate from branch 'net.randombit.botan.1_8' (head 3158f8272a3582dd44dfb771665eb71f7d005339)

            to branch 'net.randombit.botan' (head bf629b13dd132b263e76a72b7eca0f7e4ab19aac)

1 files changed, 43 insertions, 0 deletions

diff --git a/src/utils/prefetch.h b/src/utils/prefetch.h
new file mode 100644
index 000000000..7afdbda0a
--- /dev/null
+++ b/src/utils/prefetch.h
@@ -0,0 +1,43 @@
+/*
+* 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 {
+
+namespace PREFETCH {
+
+template<typename T>
+inline void readonly(const T* addr, u32bit length)
+   {
+#if defined(__GNUG__)
+   const u32bit Ts_per_cache_line = CPUID::cache_line_size() / sizeof(T);
+
+   for(u32bit i = 0; i <= length; i += Ts_per_cache_line)
+      __builtin_prefetch(addr + i, 0);
+#endif
+   }
+
+template<typename T>
+inline void readwrite(const T* addr, u32bit length)
+   {
+#if defined(__GNUG__)
+   const u32bit Ts_per_cache_line = CPUID::cache_line_size() / sizeof(T);
+
+   for(u32bit i = 0; i <= length; i += Ts_per_cache_line)
+      __builtin_prefetch(addr + i, 0);
+#endif
+   }
+
+}
+
+}
+
+#endif