i386-modes.def

Mac OS X 10.4.9 for x86 Source Code gcc 实现源代码

/* Definitions of target machine for GCC for IA-32.
   Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* The x86_64 ABI specifies both XF and TF modes.
   XFmode is __float80 is IEEE extended; TFmode is __float128
   is IEEE quad.  */

FRACTIONAL_FLOAT_MODE (XF, 80, 12, ieee_extended_intel_96_format);
FLOAT_MODE (TF, 16, ieee_quad_format);

/* In ILP32 mode, XFmode has size 12 and alignment 4.
   In LP64 mode, XFmode has size and alignment 16.  */
ADJUST_FLOAT_FORMAT (XF, (TARGET_128BIT_LONG_DOUBLE
			  ? &ieee_extended_intel_128_format
			  : TARGET_96_ROUND_53_LONG_DOUBLE
			  ? &ieee_extended_intel_96_round_53_format
			  : &ieee_extended_intel_96_format));
ADJUST_BYTESIZE  (XF, TARGET_128BIT_LONG_DOUBLE ? 16 : 12);
ADJUST_ALIGNMENT (XF, TARGET_128BIT_LONG_DOUBLE ? 16 : 4);

/* Add any extra modes needed to represent the condition code.

   For the i386, we need separate modes when floating-point
   equality comparisons are being done.

   Add CCNO to indicate comparisons against zero that requires
   Overflow flag to be unset.  Sign bit test is used instead and
   thus can be used to form "a&b>0" type of tests.

   Add CCGC to indicate comparisons against zero that allows
   unspecified garbage in the Carry flag.  This mode is used
   by inc/dec instructions.

   Add CCGOC to indicate comparisons against zero that allows
   unspecified garbage in the Carry and Overflow flag. This
   mode is used to simulate comparisons of (a-b) and (a+b)
   against zero using sub/cmp/add operations.

   Add CCZ to indicate that only the Zero flag is valid.  */

CC_MODE (CCGC);
CC_MODE (CCGOC);
CC_MODE (CCNO);
CC_MODE (CCZ);
CC_MODE (CCFP);
CC_MODE (CCFPU);

/* Vector modes.  */
VECTOR_MODES (INT, 4);        /*            V4QI V2HI */
VECTOR_MODES (INT, 8);        /*       V8QI V4HI V2SI */
VECTOR_MODES (INT, 16);       /* V16QI V8HI V4SI V2DI */
VECTOR_MODES (FLOAT, 8);      /*            V4HF V2SF */
VECTOR_MODES (FLOAT, 16);     /*       V8HF V4SF V2DF */
VECTOR_MODE (INT, DI, 4);     /*                 V4DI */
VECTOR_MODE (INT, SI, 8);     /*                 V8SI */
VECTOR_MODE (INT, HI, 16);    /*                V16HI */
VECTOR_MODE (INT, QI, 32);    /*                V32QI */
VECTOR_MODE (FLOAT, DF, 4);   /*                 V4DF */
VECTOR_MODE (FLOAT, SF, 8);   /*                 V8SF */

/* The symbol Pmode stands for one of the above machine modes (usually SImode).
   The tm.h file specifies which one.  It is not a distinct mode.  */