ArmPkg/Library/CompilerIntrinsicsLib/memcmp_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 int memcmp(void *, void *, size_t);
  17 #pragma intrinsic(memcmp)
  18 #pragma function(memcmp)
  19 int memcmp(const void *s1, const void *s2, size_t n)
  20 {
  21   unsigned char const *t1 = s1;
  22   unsigned char const *t2 = s2;
  23
  24   while (n-- != 0) {
  25     if (*t1 != *t2)
  26       return (int)*t1 - (int)*t2;
  27     t1++;
  28     t2++;
  29   }
  30
  31   return 0;
  32 }