ArmPkg/Library/CompilerIntrinsicsLib/memmove_ms.c

//------------------------------------------------------------------------------
//
// Copyright (c) 2019, Pete Batard. All rights reserved.
// Copyright (c) 2021, Arm Limited. All rights reserved.<BR>
//
// SPDX-License-Identifier: BSD-2-Clause-Patent
//
//------------------------------------------------------------------------------

#if defined(_M_ARM64)
typedef unsigned __int64  size_t;
#else
typedef unsigned __int32  size_t;
#endif

void* memmove(void *, const void *, size_t);
#pragma intrinsic(memmove)
#pragma function(memmove)
void* memmove(void *dest, const void *src, size_t n)
{
  unsigned char *d;
  unsigned char const *s;

  d = dest;
  s = src;

  if (d < s) {
    while (n-- != 0) {
      *d++ = *s++;
    }
  } else {
    d += n;
    s += n;
    while (n-- != 0) {
      *--d = *--s;
    }
  }

  return dest;
}