gcc/config/mmix/mmix-modes.def

   1 /* Definitions of target machine for GNU compiler, for MMIX.
   2    Copyright (C) 2002 Free Software Foundation, Inc.
   3    Contributed by Hans-Peter Nilsson (hp@bitrange.com)
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GCC 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
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 /* Node: Condition Code */
  23
  24 /* Like other non-CC0 ports, MMIX need to code which combination of
  25    comparison insn and branch insn or conditional-set insn to use into the
  26    condition mode.  The CC mode depends partly on which condition is used
  27    and partly on the type of the operands.  */
  28
  29 /* The "usual" CC mode is used for a signed operands integer comparison,
  30    where the CMP insn is used and the result is (integer) -1, 0 or 1 for
  31    respectively a < b, a == b and a > b.  */
  32
  33 /* The CC_UNS mode is for an unsigned operands integer comparison using
  34    the CMPU insn.  Result values correspond to those in CCmode.  */
  35 CC_MODE (CC_UNS);
  36
  37 /* The CC_FP mode is for a non-equality floating-point comparison, using
  38    the FCMP or FCMPE insn.  The result is (integer) -1 or 1 for
  39    espectively a < b and a > b, otherwise 0.  */
  40 CC_MODE (CC_FP);
  41
  42 /* The CC_FPEQ mode is for an equality floating-point comparison, using
  43    the FEQL or FEQLE insn.  The result is (integer) 1 for a == b,
  44    otherwise 0 (including NaN:s).  */
  45 CC_MODE (CC_FPEQ);
  46
  47 /* The CC_FUN mode is for an ordering comparison, using the FUN or FUNE
  48    insn.  The result is (integer) 1 if a is unordered to b, otherwise the
  49    result is 0.  */
  50 CC_MODE (CC_FUN);