ArmPkg/Library/CompilerIntrinsicsLib/memmove_ms.c

   1 //------------------------------------------------------------------------------
   2 //
   3 // Copyright (c) 2019, Pete Batard. All rights reserved.
   4 // Copyright (c) 2021, Arm Limited. All rights reserved.<BR>
   5 //
   6 // SPDX-License-Identifier: BSD-2-Clause-Patent
   7 //
   8 //------------------------------------------------------------------------------
   9
  10 #if defined(_M_ARM64)
  11 typedef unsigned __int64  size_t;
  12 #else
  13 typedef unsigned __int32  size_t;
  14 #endif
  15
  16 void* memmove(void *, const void *, size_t);
  17 #pragma intrinsic(memmove)
  18 #pragma function(memmove)
  19 void* memmove(void *dest, const void *src, size_t n)
  20 {
  21   unsigned char *d = dest;
  22   unsigned char const *s = src;
  23
  24   if (d < s) {
  25     while (n-- != 0) {
  26       *d++ = *s++;
  27     }
  28   } else {
  29     d += n;
  30     s += n;
  31     while (n-- != 0) {
  32       *--d = *--s;
  33     }
  34   }
  35
  36   return dest;
  37 }