ArmPkg/Library/CompilerIntrinsicsLib/memcmp_ms.c

//------------------------------------------------------------------------------
//
// Copyright (c) 2019, Pete Batard. All rights reserved.
//
// SPDX-License-Identifier: BSD-2-Clause-Patent
//
//------------------------------------------------------------------------------

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

int memcmp(void *, void *, size_t);
#pragma intrinsic(memcmp)
#pragma function(memcmp)
int memcmp(const void *s1, const void *s2, size_t n)
{
  unsigned char const *t1 = s1;
  unsigned char const *t2 = s2;

  while (n--) {
    if (*t1 != *t2)
      return (int)*t1 - (int)*t2;
    t1++;
    t2++;
  }

  return 0;
}