1 files changed, 33 insertions, 0 deletions
diff --git a/OldMdePkg/Library/BaseLib/Ia32/RShiftU64.c b/OldMdePkg/Library/BaseLib/Ia32/RShiftU64.c
new file mode 100644
index 0000000000..cc878e878c
--- /dev/null
+++ b/OldMdePkg/Library/BaseLib/Ia32/RShiftU64.c
@@ -0,0 +1,33 @@
+/** @file
+  64-bit logical right shift function for IA-32
+
+  Copyright (c) 2006 - 2007, Intel Corporation<BR>
+  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.
+
+**/
+
+UINT64
+EFIAPI
+InternalMathRShiftU64 (
+  IN      UINT64                    Operand,
+  IN      UINTN                     Count
+  )
+{
+  _asm {
+    mov     cl, byte ptr [Count]
+    xor     edx, edx
+    mov     eax, dword ptr [Operand + 4]
+    test    cl, 32
+    cmovz   edx, eax
+    cmovz   eax, dword ptr [Operand + 0]
+    shrd    eax, edx, cl
+    shr     edx, cl
+  }
+}
+