CopyMem.c revision 4fd606d1f5abe38e1f42c38de1d2e895166bd0f4
/** @file
Implementation of the InternalMemCopyMem routine. This function is broken
out into its own source file so that it can be excluded from a build for a
particular platform easily if an optimized version is desired.
Copyright (c) 2006 - 2010, 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
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "MemLibInternals.h"
/**
Copy Length bytes from Source to Destination.
@param DestinationBuffer The target of the copy request.
@param SourceBuffer The place to copy from.
@param Length The number of bytes to copy.
@return Destination
**/
VOID *
)
{
//
// Declare the local variables that actually move the data elements as
// volatile to prevent the optimizer from replacing this function with
// the intrinsic memcpy()
//
volatile UINT8 *Destination8;
if (SourceBuffer > DestinationBuffer) {
while (Length-- != 0) {
*(Destination8++) = *(Source8++);
}
} else if (SourceBuffer < DestinationBuffer) {
while (Length-- != 0) {
*(--Destination8) = *(--Source8);
}
}
return DestinationBuffer;
}