gcc/config/i386/i386-modes.def

   1 /* Definitions of target machine for GCC for IA-32.
   2    Copyright (C) 2002 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GCC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* x86_64 ABI specifies both XF and TF modes.
  22    XFmode is __float80 is IEEE extended; TFmode is __float128
  23    is IEEE quad.
  24
  25    IEEE extended is 128 bits wide, except in ILP32 mode, but we
  26    have to say it's 12 bytes so that the bitsize and wider_mode
  27    tables are correctly set up.  We correct its size below.  */
  28
  29 FLOAT_MODE (XF, 12, ieee_extended_intel_96_format);
  30 ADJUST_BYTESIZE  (XF, TARGET_128BIT_LONG_DOUBLE ? 16 : 12);
  31 ADJUST_ALIGNMENT (XF, TARGET_128BIT_LONG_DOUBLE ? 16 : 4);
  32 FLOAT_MODE (TF, 16, ieee_quad_format);
  33
  34 /* Add any extra modes needed to represent the condition code.
  35
  36    For the i386, we need separate modes when floating-point
  37    equality comparisons are being done.
  38
  39    Add CCNO to indicate comparisons against zero that requires
  40    Overflow flag to be unset.  Sign bit test is used instead and
  41    thus can be used to form "a&b>0" type of tests.
  42
  43    Add CCGC to indicate comparisons against zero that allows
  44    unspecified garbage in the Carry flag.  This mode is used
  45    by inc/dec instructions.
  46
  47    Add CCGOC to indicate comparisons against zero that allows
  48    unspecified garbage in the Carry and Overflow flag. This
  49    mode is used to simulate comparisons of (a-b) and (a+b)
  50    against zero using sub/cmp/add operations.
  51
  52    Add CCZ to indicate that only the Zero flag is valid.  */
  53
  54 CC_MODE (CCGC);
  55 CC_MODE (CCGOC);
  56 CC_MODE (CCNO);
  57 CC_MODE (CCZ);
  58 CC_MODE (CCFP);
  59 CC_MODE (CCFPU);