1 files changed, 44 insertions, 0 deletions
diff --git a/OldMdePkg/Library/BaseLib/Ia32/RShiftU64.S b/OldMdePkg/Library/BaseLib/Ia32/RShiftU64.S
new file mode 100644
index 0000000000..ca78394e39
--- /dev/null
+++ b/OldMdePkg/Library/BaseLib/Ia32/RShiftU64.S
@@ -0,0 +1,44 @@
+#------------------------------------------------------------------------------
+#
+# 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:
+#
+#   RShiftU64.asm
+#
+# Abstract:
+#
+#   64-bit logical right shift function for IA-32
+#
+#------------------------------------------------------------------------------
+
+    .686:
+    .code:
+
+.globl ASM_PFX(InternalMathRShiftU64)
+
+#------------------------------------------------------------------------------
+# UINT64
+# EFIAPI
+# InternalMathRShiftU64 (
+#   IN      UINT64                    Operand,
+#   IN      UINTN                     Count
+#   );
+#------------------------------------------------------------------------------
+ASM_PFX(InternalMathRShiftU64):
+    movb    12(%esp), %cl
+    xorl    %edx, %edx
+    movl    8(%esp), %eax
+    testb   $32, %cl
+    cmovz   %eax, %edx
+    cmovz   0x4(%esp), %eax
+    shrdl   %cl, %edx, %eax
+    shr     %cl, %edx
+    ret