1 files changed, 51 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/Ia32/LRotU64.asm b/MdePkg/Library/BaseLib/Ia32/LRotU64.asm
new file mode 100644
index 000000000000..c8c1eabab000
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/LRotU64.asm
@@ -0,0 +1,51 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
+; 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:
+;
+;   LRotU64.asm
+;
+; Abstract:
+;
+;   64-bit left rotation for Ia32
+;
+;------------------------------------------------------------------------------
+
+    .686
+    .model  flat,C
+    .code
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; InternalMathLRotU64 (
+;   IN      UINT64                    Operand,
+;   IN      UINTN                     Count
+;   );
+;------------------------------------------------------------------------------
+InternalMathLRotU64 PROC    USES    ebx
+    mov     cl, [esp + 16]
+    mov     edx, [esp + 12]
+    mov     eax, [esp + 8]
+    shld    ebx, edx, cl
+    shld    edx, eax, cl
+    ror     ebx, cl
+    shld    eax, ebx, cl
+    test    cl, 32                      ; Count >= 32?
+    jz      @F
+    mov     ecx, eax
+    mov     eax, edx
+    mov     edx, ecx
+@@:    
+    ret
+InternalMathLRotU64 ENDP
+
+    END