Add BaseMemoryLib optimized for DXE

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@4036 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 50 insertions, 0 deletions

diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/Ia32/ScanMem16.S b/MdePkg/Library/BaseMemoryLibOptDxe/Ia32/ScanMem16.S
new file mode 100644
index 0000000000..5e65b9667a
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibOptDxe/Ia32/ScanMem16.S
@@ -0,0 +1,50 @@
+#------------------------------------------------------------------------------
+#
+# 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:
+#
+#   ScanMem16.Asm
+#
+# Abstract:
+#
+#   ScanMem16 function
+#
+# Notes:
+#
+#   The following BaseMemoryLib instances share the same version of this file:
+#
+#       BaseMemoryLibRepStr
+#       BaseMemoryLibMmx
+#       BaseMemoryLibSse2
+#
+#------------------------------------------------------------------------------
+
+.globl _InternalMemScanMem16
+
+#------------------------------------------------------------------------------
+# CONST VOID *
+# EFIAPI
+# InternalMemScanMem16 (
+#   IN      CONST VOID                *Buffer,
+#   IN      UINTN                     Length,
+#   IN      UINT16                    Value
+#   );
+#------------------------------------------------------------------------------
+_InternalMemScanMem16:
+    push    %edi
+    movl    12(%esp), %ecx
+    movl    8(%esp), %edi
+    movl    16(%esp), %eax
+    repne   scasw
+    leal    -2(%edi), %eax
+    cmovnz  %ecx, %eax
+    pop     %edi
+    ret