sysdeps/alpha/ots_cmp.c

   1 /* Software floating-point emulation: comparison.
   2    Copyright (C) 1997-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include "local-soft-fp.h"
  20
  21 static long
  22 internal_equality (long al, long ah, long bl, long bh, long neq)
  23 {
  24   FP_DECL_EX;
  25   FP_DECL_Q(A); FP_DECL_Q(B);
  26   long r;
  27
  28   AXP_UNPACK_RAW_Q(A, a);
  29   AXP_UNPACK_RAW_Q(B, b);
  30
  31   if ((A_e == _FP_EXPMAX_Q && !_FP_FRAC_ZEROP_2(A))
  32        || (B_e == _FP_EXPMAX_Q && !_FP_FRAC_ZEROP_2(B)))
  33     {
  34       /* EQ and NE signal invalid operation only if either operand is SNaN.  */
  35       if (FP_ISSIGNAN_Q(A) || FP_ISSIGNAN_Q(B))
  36         {
  37           FP_SET_EXCEPTION(FP_EX_INVALID);
  38           FP_HANDLE_EXCEPTIONS;
  39         }
  40       return -1;
  41     }
  42
  43   r = (A_e == B_e
  44        && _FP_FRAC_EQ_2 (A, B)
  45        && (A_s == B_s || (!A_e && _FP_FRAC_ZEROP_2(A))));
  46   r ^= neq;
  47
  48   return r;
  49 }
  50
  51 long
  52 _OtsEqlX (long al, long ah, long bl, long bh)
  53 {
  54   return internal_equality (al, ah, bl, bh, 0);
  55 }
  56
  57 long
  58 _OtsNeqX (long al, long ah, long bl, long bh)
  59 {
  60   return internal_equality (al, ah, bl, bh, 1);
  61 }