add comments to clarify the enhancement on EHCI driver, which is guaranteed to get...

[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibRepStr / CompareMemWrapper.c

diff --git a/MdePkg/Library/BaseMemoryLibRepStr/CompareMemWrapper.c b/MdePkg/Library/BaseMemoryLibRepStr/CompareMemWrapper.c
index e3b0fe3fd6c38b2a4f74cbd307d4a74cf1eba745..688c2108b88be86ba8caf24e81c2483432b3c127 100644 (file)
--- a/MdePkg/Library/BaseMemoryLibRepStr/CompareMemWrapper.c
+++ b/MdePkg/Library/BaseMemoryLibRepStr/CompareMemWrapper.c
@@ -1,7 +1,17 @@
 /** @file\r
   CompareMem() implementation.\r
 \r
-  Copyright (c) 2006, Intel Corporation<BR>\r
+  The following BaseMemoryLib instances contain the same copy of this file:\r
+    BaseMemoryLib\r
+    BaseMemoryLibMmx\r
+    BaseMemoryLibSse2\r
+    BaseMemoryLibRepStr\r
+    BaseMemoryLibOptDxe\r
+    BaseMemoryLibOptPei\r
+    PeiMemoryLib\r
+    DxeMemoryLib\r
+\r
+  Copyright (c) 2006 - 2008, Intel Corporation<BR>\r
   All rights reserved. This program and the accompanying materials\r
   are licensed and made available under the terms and conditions of the BSD License\r
   which accompanies this distribution.  The full text of the license may be found at\r
@@ -10,17 +20,6 @@
   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
 \r
-  Module Name:  CompareMemWrapper.c\r
-\r
-  The following BaseMemoryLib instances share the same version of this file:\r
-\r
-    BaseMemoryLib\r
-    BaseMemoryLibMmx\r
-    BaseMemoryLibSse2\r
-    BaseMemoryLibRepStr\r
-    PeiMemoryLib\r
-    UefiMemoryLib\r
-\r
 **/\r
 \r
 #include "MemLibInternals.h"\r
@@ -32,11 +31,11 @@
   If all Length bytes of the two buffers are identical, then 0 is returned.  Otherwise, the\r
   value returned is the first mismatched byte in SourceBuffer subtracted from the first\r
   mismatched byte in DestinationBuffer.\r
-  If Length > 0 and DestinationBuffer is NULL and Length > 0, then ASSERT().\r
-  If Length > 0 and SourceBuffer is NULL and Length > 0, then ASSERT().\r
-  If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then ASSERT(). \r
-  If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT(). \r
-\r
+  \r
+  If Length > 0 and DestinationBuffer is NULL, then ASSERT().\r
+  If Length > 0 and SourceBuffer is NULL, then ASSERT().\r
+  If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then ASSERT().\r
+  If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT().\r
 \r
   @param  DestinationBuffer Pointer to the destination buffer to compare.\r
   @param  SourceBuffer      Pointer to the source buffer to compare.\r
@@ -45,7 +44,7 @@
   @return 0                 All Length bytes of the two buffers are identical.\r
   @retval Non-zero          The first mismatched byte in SourceBuffer subtracted from the first\r
                             mismatched byte in DestinationBuffer.\r
-\r
+                            \r
 **/\r
 INTN\r
 EFIAPI\r
@@ -55,7 +54,7 @@ CompareMem (
   IN UINTN       Length\r
   )\r
 {\r
-  if (Length == 0) {\r
+  if (Length == 0 || DestinationBuffer == SourceBuffer) {\r
     return 0;\r
   }\r
   ASSERT (DestinationBuffer != NULL);\r