1 files changed, 36 insertions, 0 deletions
diff --git a/modules/asm/mp_amd64/bswap.h b/modules/asm/mp_amd64/bswap.h
new file mode 100644
index 000000000..3c77b460c
--- /dev/null
+++ b/modules/asm/mp_amd64/bswap.h
@@ -0,0 +1,36 @@
+/*************************************************
+* Byte Swapping Operations Header File           *
+* (C) 1999-2008 Jack Lloyd                       *
+*************************************************/
+
+#ifndef BOTAN_BSWAP_H__
+#define BOTAN_BSWAP_H__
+
+#include <botan/types.h>
+#include <botan/rotate.h>
+
+namespace Botan {
+
+/*************************************************
+* Byte Swapping Functions                        *
+*************************************************/
+inline u16bit reverse_bytes(u16bit input)
+   {
+   return rotate_left(input, 8);
+   }
+
+inline u32bit reverse_bytes(u32bit input)
+   {
+   asm("bswapl %0" : "=r" (input) : "0" (input));
+   return input;
+   }
+
+inline u64bit reverse_bytes(u64bit input)
+   {
+   asm("bswapq %0" : "=r" (input) : "0" (input));
+   return input;
+   }
+
+}
+
+#endif