ArmPkg/Library/CompilerIntrinsicsLib/memcmp_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 int memcmp(void *, void *, size_t);
  16 #pragma intrinsic(memcmp)
  17 #pragma function(memcmp)
  18 int memcmp(const void *s1, const void *s2, size_t n)
  19 {
  20   unsigned char const *t1 = s1;
  21   unsigned char const *t2 = s2;
  22
  23   while (n--) {
  24     if (*t1 != *t2)
  25       return (int)*t1 - (int)*t2;
  26     t1++;
  27     t2++;
  28   }
  29
  30   return 0;
  31 }