1 files changed, 43 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/Ia32/RRotU64.S b/MdePkg/Library/BaseLib/Ia32/RRotU64.S
new file mode 100644
index 0000000000..541e420a3c
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/RRotU64.S
@@ -0,0 +1,43 @@
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006, Intel Corporation
+# All rights reserved. This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution.  The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+# Module Name:
+#
+#   RRotU64.asm
+#
+# Abstract:
+#
+#   64-bit right rotation for Ia32
+#
+#------------------------------------------------------------------------------
+
+
+
+     
+
+.global _RRotU64
+    push    %ebx
+    movb    16(%esp),%cl
+    movl    8(%esp),%eax
+    movl    12(%esp),%edx
+    shrdl   %cl,%eax,%ebx
+    shrdl   %cl,%edx,%eax
+    roll    %cl,%ebx
+    shrdl   %cl,%ebx,%edx
+    testb   $32,%cl
+    cmovnz  %eax, %ecx
+    cmovnz  %edx, %eax
+    cmovnz  %ecx, %edx
+    pop     %ebx
+    ret
+
+
+