ArmPkg/Library/CompilerIntrinsicsLib/Arm/ucmpdi2.c

   1 /** @file
   2   Compiler intrinsic for 64-bit compare, ported from LLVM code.
   3
   4   Copyright (c) 2008-2009, Apple Inc. All rights reserved.<BR>
   5
   6   SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9 /**
  10   University of Illinois/NCSA
  11   Open Source License
  12
  13   Copyright (c) 2003-2008 University of Illinois at Urbana-Champaign.
  14   All rights reserved.
  15
  16   Developed by:
  17
  18       LLVM Team
  19
  20       University of Illinois at Urbana-Champaign
  21
  22       http://llvm.org
  23
  24   Permission is hereby granted, free of charge, to any person obtaining a copy of
  25   this software and associated documentation files (the "Software"), to deal with
  26   the Software without restriction, including without limitation the rights to
  27   use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
  28   of the Software, and to permit persons to whom the Software is furnished to do
  29   so, subject to the following conditions:
  30
  31       * Redistributions of source code must retain the above copyright notice,
  32         this list of conditions and the following disclaimers.
  33
  34       * Redistributions in binary form must reproduce the above copyright notice,
  35         this list of conditions and the following disclaimers in the
  36         documentation and/or other materials provided with the distribution.
  37
  38       * Neither the names of the LLVM Team, University of Illinois at
  39         Urbana-Champaign, nor the names of its contributors may be used to
  40         endorse or promote products derived from this Software without specific
  41         prior written permission.
  42
  43   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  44   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
  45   FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  46   CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  47   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  48   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
  49   SOFTWARE.
  50 **/
  51
  52
  53 #include "Llvm_int_lib.h"
  54
  55
  56 // Returns:  if (a <  b) returns 0
  57 //           if (a == b) returns 1
  58 //           if (a >  b) returns 2
  59
  60 UINT32
  61 __ucmpdi2(UINT64 a, UINT64 b)
  62 {
  63     udwords x;
  64     x.all = a;
  65     udwords y;
  66     y.all = b;
  67     if (x.high < y.high)
  68         return 0;
  69     if (x.high > y.high)
  70         return 2;
  71     if (x.low < y.low)
  72         return 0;
  73     if (x.low > y.low)
  74         return 2;
  75     return 1;
  76 }