Add S assembler file for BaseMemoryLibOptDxe driver.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6201 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseMemoryLibOptDxe/X64/CopyMem.S

@@ -0,0 +1,75 @@
+#
+# ConvertAsm.py: Automatically generated from CopyMem.asm
+#
+#------------------------------------------------------------------------------
+#
+# 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:
+#
+#   CopyMem.S
+#
+# Abstract:
+#
+#   CopyMem function
+#
+# Notes:
+#
+#------------------------------------------------------------------------------
+
+
+#------------------------------------------------------------------------------
+#  VOID *
+#  EFIAPI
+#  InternalMemCopyMem (
+#    IN VOID   *Destination,
+#    IN VOID   *Source,
+#    IN UINTN  Count
+#    )
+#------------------------------------------------------------------------------
+.intel_syntax noprefix
+.globl ASM_PFX(InternalMemCopyMem)
+ASM_PFX(InternalMemCopyMem):
+    push    rsi
+    push    rdi
+    mov     rsi, rdx                    # rsi <- Source
+    mov     rdi, rcx                    # rdi <- Destination
+    lea     r9, [rsi + r8 - 1]          # r9 <- End of Source
+    cmp     rsi, rdi
+    mov     rax, rdi                    # rax <- Destination as return value
+    jae     L0
+    cmp     r9, rdi
+    jae     L_CopyBackward              # Copy backward if overlapped
+L0:
+    mov     rcx, r8
+    and     r8, 7
+    shr     rcx, 3                      # rcx <- # of Qwords to copy
+    jz      L_CopyBytes
+    movd    r10, mm0                    # (Save mm0 in r10)
+L1:
+    movq    mm0, [rsi]
+    movntq  [rdi], mm0
+    add     rsi, 8
+    add     rdi, 8
+    loop    L1
+    mfence
+    movd    mm0, r10                    # (Restore mm0)
+    jmp     L_CopyBytes
+L_CopyBackward:
+    mov     rsi, r9                     # rsi <- End of Source
+    lea     rdi, [rdi + r8 - 1]         # rdi <- End of Destination
+    std                                 # set direction flag
+L_CopyBytes:
+    mov     rcx, r8
+    rep     movsb                       # Copy bytes backward
+    cld
+    pop     rdi
+    pop     rsi
+    ret