ArmPkg/Library/CompilerIntrinsicsLib/memmove_ms.c

   1 //------------------------------------------------------------------------------
   2 //
   3 // Copyright (c) 2019, Pete Batard. All rights reserved.
   4 //
   5 // SPDX-License-Identifier: BSD-2-Clause-Patent
   6 //
   7 //------------------------------------------------------------------------------
   8
   9 #if defined(_M_ARM64)
  10 typedef unsigned __int64  size_t;
  11 #else
  12 typedef unsigned __int32  size_t;
  13 #endif
  14
  15 void* memmove(void *, const void *, size_t);
  16 #pragma intrinsic(memmove)
  17 #pragma function(memmove)
  18 void* memmove(void *dest, const void *src, size_t n)
  19 {
  20   unsigned char *d = dest;
  21   unsigned char const *s = src;
  22
  23   if (d < s) {
  24     while (n--)
  25       *d++ = *s++;
  26   } else {
  27     d += n;
  28     s += n;
  29     while (n--)
  30       *--d = *--s;
  31   }
  32
  33   return dest;
  34 }