sysdeps/alpha/soft-fp/ots_cmp.c

   1 /* Software floating-point emulation: comparison.
   2    Copyright (C) 1997,1999,2004 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, write to the Free
  19    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  20    02111-1307 USA.  */
  21
  22 #include "local-soft-fp.h"
  23
  24 static long
  25 internal_equality (long al, long ah, long bl, long bh, long neq)
  26 {
  27   FP_DECL_EX;
  28   FP_DECL_Q(A); FP_DECL_Q(B);
  29   long r;
  30
  31   FP_UNPACK_RAW_Q(A, a);
  32   FP_UNPACK_RAW_Q(B, b);
  33
  34   if ((A_e == _FP_EXPMAX_Q && !_FP_FRAC_ZEROP_2(A))
  35        || (B_e == _FP_EXPMAX_Q && !_FP_FRAC_ZEROP_2(B)))
  36     {
  37       /* EQ and NE signal invalid operation only if either operand is SNaN.  */
  38       if (FP_ISSIGNAN_Q(A) || FP_ISSIGNAN_Q(B))
  39         {
  40           FP_SET_EXCEPTION(FP_EX_INVALID);
  41           FP_HANDLE_EXCEPTIONS;
  42         }
  43       return -1;
  44     }
  45
  46   r = (A_e == B_e
  47        && _FP_FRAC_EQ_2 (A, B)
  48        && (A_s == B_s || (!A_e && _FP_FRAC_ZEROP_2(A))));
  49   r ^= neq;
  50
  51   return r;
  52 }
  53
  54 long
  55 _OtsEqlX (long al, long ah, long bl, long bh)
  56 {
  57   return internal_equality (al, ah, bl, bh, 0);
  58 }
  59
  60 long
  61 _OtsNeqX (long al, long ah, long bl, long bh)
  62 {
  63   return internal_equality (al, ah, bl, bh, 1);
  64 }