1 files changed, 61 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseMemoryLibOptDxe/Ia32/ScanMem64.S b/Core/MdePkg/Library/BaseMemoryLibOptDxe/Ia32/ScanMem64.S
new file mode 100644
index 0000000000..c8f76f14a0
--- /dev/null
+++ b/Core/MdePkg/Library/BaseMemoryLibOptDxe/Ia32/ScanMem64.S
@@ -0,0 +1,61 @@
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006 - 2008, 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:
+#
+#   ScanMem64.S
+#
+# Abstract:
+#
+#   ScanMem64 function
+#
+# Notes:
+#
+#   The following BaseMemoryLib instances contain the same copy of this file:
+#
+#       BaseMemoryLibRepStr
+#       BaseMemoryLibMmx
+#       BaseMemoryLibSse2
+#       BaseMemoryLibOptDxe
+#       BaseMemoryLibOptPei
+#
+#------------------------------------------------------------------------------
+
+ASM_GLOBAL ASM_PFX(InternalMemScanMem64)
+
+#------------------------------------------------------------------------------
+# CONST VOID *
+# EFIAPI
+# InternalMemScanMem64 (
+#   IN      CONST VOID                *Buffer,
+#   IN      UINTN                     Length,
+#   IN      UINT64                    Value
+#   );
+#------------------------------------------------------------------------------
+ASM_PFX(InternalMemScanMem64):
+    push    %edi
+    movl    12(%esp), %ecx
+    movl    16(%esp), %eax
+    movl    20(%esp), %edx
+    movl    8(%esp), %edi
+L0:
+    cmpl    (%edi), %eax
+    leal    8(%edi), %edi
+    loopne  L0
+    jne     L1
+    cmpl    -4(%edi), %edx
+    jecxz   L1
+    jne     L0
+L1:
+    leal    -8(%edi), %eax
+    cmovne  %ecx, %eax
+    pop     %edi
+    ret