1 | */* mpn_cmp -- Compare two low-level natural-number integers.* |

2 | |

3 | *Copyright (C) 1991-2019 Free Software Foundation, Inc.* |

4 | |

5 | *This file is part of the GNU MP Library.* |

6 | |

7 | *The GNU MP Library is free software; you can redistribute it and/or modify* |

8 | *it under the terms of the GNU Lesser General Public License as published by* |

9 | *the Free Software Foundation; either version 2.1 of the License, or (at your* |

10 | *option) any later version.* |

11 | |

12 | *The GNU MP Library is distributed in the hope that it will be useful, but* |

13 | *WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY* |

14 | *or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public* |

15 | *License for more details.* |

16 | |

17 | *You should have received a copy of the GNU Lesser General Public License* |

18 | *along with the GNU MP Library; see the file COPYING.LIB. If not, see* |

19 | *<http://www.gnu.org/licenses/>. */* |

20 | |

21 | __#include <gmp.h>__ |

22 | __#include "gmp-impl.h"__ |

23 | |

24 | */* Compare OP1_PTR/OP1_SIZE with OP2_PTR/OP2_SIZE.* |

25 | * There are no restrictions on the relative sizes of* |

26 | * the two arguments.* |

27 | * Return 1 if OP1 > OP2, 0 if they are equal, and -1 if OP1 < OP2. */* |

28 | |

29 | *int* |

30 | mpn_cmp (mp_srcptr op1_ptr, mp_srcptr op2_ptr, mp_size_t size) |

31 | { |

32 | mp_size_t i; |

33 | mp_limb_t op1_word, op2_word; |

34 | |

35 | **for** (i = size - `1`; i >= `0`; i--) |

36 | { |

37 | op1_word = op1_ptr[i]; |

38 | op2_word = op2_ptr[i]; |

39 | **if** (op1_word != op2_word) |

40 | **goto** diff; |

41 | } |

42 | **return** `0`; |

43 | diff: |

44 | */* This can *not* be simplified to* |

45 | * op2_word - op2_word* |

46 | * since that expression might give signed overflow. */* |

47 | **return** (op1_word > op2_word) ? `1` : -`1`; |

48 | } |

49 | |