1 files changed, 48 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/Ia32/LRotU64.S b/Core/MdePkg/Library/BaseLib/Ia32/LRotU64.S
new file mode 100644
index 0000000000..ff450fa1f5
--- /dev/null
+++ b/Core/MdePkg/Library/BaseLib/Ia32/LRotU64.S
@@ -0,0 +1,48 @@
+#------------------------------------------------------------------------------
+#
+# 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.S
+#
+# Abstract:
+#
+#   64-bit left rotation for Ia32
+#
+#------------------------------------------------------------------------------
+
+ASM_GLOBAL ASM_PFX(InternalMathLRotU64)
+
+#------------------------------------------------------------------------------
+# UINT64
+# EFIAPI
+# InternalMathLRotU64 (
+#   IN      UINT64                    Operand,
+#   IN      UINTN                     Count
+#   );
+#------------------------------------------------------------------------------
+ASM_PFX(InternalMathLRotU64):
+    push    %ebx
+    movb    16(%esp), %cl
+    movl    12(%esp), %edx
+    movl    8(%esp), %eax
+    shldl   %cl, %edx, %ebx
+    shldl   %cl, %eax, %edx
+    rorl    %cl, %ebx
+    shldl   %cl, %ebx, %eax
+    testb   $32, %cl                    # Count >= 32?
+    jz      L0
+    movl    %eax, %ecx
+    movl    %edx, %eax
+    movl    %ecx, %edx
+L0:    
+    pop     %ebx
+    ret