1 files changed, 59 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseMemoryLibOptPei/X64/CompareMem.S b/MdePkg/Library/BaseMemoryLibOptPei/X64/CompareMem.S
new file mode 100644
index 000000000000..503127c23e0d
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibOptPei/X64/CompareMem.S
@@ -0,0 +1,59 @@
+#
+# ConvertAsm.py: Automatically generated from CompareMem.asm
+#
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006 - 2009, 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:
+#
+#   CompareMem.S
+#
+# Abstract:
+#
+#   CompareMem function
+#
+# Notes:
+#
+#   The following BaseMemoryLib instances contain the same copy of this file:
+#
+#       BaseMemoryLibRepStr
+#       BaseMemoryLibMmx
+#       BaseMemoryLibSse2
+#       BaseMemoryLibOptDxe
+#       BaseMemoryLibOptPei
+#
+#------------------------------------------------------------------------------
+
+
+#------------------------------------------------------------------------------
+# INTN
+# EFIAPI
+# InternalMemCompareMem (
+#   IN      CONST VOID                *DestinationBuffer,
+#   IN      CONST VOID                *SourceBuffer,
+#   IN      UINTN                     Length
+#   );
+#------------------------------------------------------------------------------
+ASM_GLOBAL ASM_PFX(InternalMemCompareMem)
+ASM_PFX(InternalMemCompareMem):
+    pushq   %rsi
+    pushq   %rdi
+    movq    %rcx, %rsi
+    movq    %rdx, %rdi
+    movq    %r8, %rcx
+    repe    cmpsb
+    movzbq  -1(%rsi) , %rax
+    movzbq  -1(%rdi) , %rdx
+    subq    %rdx, %rax
+    popq    %rdi
+    popq    %rsi
+    ret
+