ports/sysdeps/alpha/soft-fp/ots_cmp.c

   1 /* Software floating-point emulation: comparison.
   2    Copyright (C) 1997-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Richard Henderson (rth@cygnus.com) and
   5                   Jakub Jelinek (jj@ultra.linux.cz).
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library.  If not, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include "local-soft-fp.h"
  22
  23 static long
  24 internal_equality (long al, long ah, long bl, long bh, long neq)
  25 {
  26   FP_DECL_EX;
  27   FP_DECL_Q(A); FP_DECL_Q(B);
  28   long r;
  29
  30   FP_UNPACK_RAW_Q(A, a);
  31   FP_UNPACK_RAW_Q(B, b);
  32
  33   if ((A_e == _FP_EXPMAX_Q && !_FP_FRAC_ZEROP_2(A))
  34        || (B_e == _FP_EXPMAX_Q && !_FP_FRAC_ZEROP_2(B)))
  35     {
  36       /* EQ and NE signal invalid operation only if either operand is SNaN.  */
  37       if (FP_ISSIGNAN_Q(A) || FP_ISSIGNAN_Q(B))
  38         {
  39           FP_SET_EXCEPTION(FP_EX_INVALID);
  40           FP_HANDLE_EXCEPTIONS;
  41         }
  42       return -1;
  43     }
  44
  45   r = (A_e == B_e
  46        && _FP_FRAC_EQ_2 (A, B)
  47        && (A_s == B_s || (!A_e && _FP_FRAC_ZEROP_2(A))));
  48   r ^= neq;
  49
  50   return r;
  51 }
  52
  53 long
  54 _OtsEqlX (long al, long ah, long bl, long bh)
  55 {
  56   return internal_equality (al, ah, bl, bh, 0);
  57 }
  58
  59 long
  60 _OtsNeqX (long al, long ah, long bl, long bh)
  61 {
  62   return internal_equality (al, ah, bl, bh, 1);
  63 }