1 files changed, 66 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseMemoryLibRepStr/X64/CopyMem.S b/MdePkg/Library/BaseMemoryLibRepStr/X64/CopyMem.S
new file mode 100644
index 000000000000..73f5964739f0
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibRepStr/X64/CopyMem.S
@@ -0,0 +1,66 @@
+#
+# ConvertAsm.py: Automatically generated from CopyMem.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:
+#
+#   CopyMem.S
+#
+# Abstract:
+#
+#   CopyMem function
+#
+# Notes:
+#
+#------------------------------------------------------------------------------
+
+
+#------------------------------------------------------------------------------
+#  VOID *
+#  EFIAPI
+#  InternalMemCopyMem (
+#    IN VOID   *Destination,
+#    IN VOID   *Source,
+#    IN UINTN  Count
+#    )
+#------------------------------------------------------------------------------
+ASM_GLOBAL ASM_PFX(InternalMemCopyMem)
+ASM_PFX(InternalMemCopyMem):
+    pushq   %rsi
+    pushq   %rdi
+    movq    %rdx, %rsi                  # rsi <- Source
+    movq    %rcx, %rdi                  # rdi <- Destination
+    leaq    -1(%rsi, %r8,), %r9         # r9 <- End of Source
+    cmpq    %rdi, %rsi
+    movq    %rdi, %rax                  # rax <- Destination as return value
+    jae     L0
+    cmpq    %rdi, %r9
+    jae     L_CopyBackward               # Copy backward if overlapped
+L0:
+    movq    %r8, %rcx
+    andq    $7, %r8
+    shrq    $3, %rcx
+    rep     movsq                       # Copy as many Qwords as possible
+    jmp     L_CopyBytes
+L_CopyBackward:
+    movq    %r9, %rsi                   # rsi <- End of Source
+    leaq    -1(%rdi, %r8),  %rdi        # esi <- End of Destination
+    std                                 # set direction flag
+L_CopyBytes:
+    movq    %r8, %rcx
+    rep     movsb                       # Copy bytes backward
+    cld
+    popq    %rdi
+    popq    %rsi
+    ret
+