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Annotation of GNUtools/cc/machmode.def, revision 1.1

1.1     ! root        1: /* This file contains the definitions and documentation for the
        !             2:    machine modes used in the the GNU compiler.
        !             3:    Copyright (C) 1987, 1992 Free Software Foundation, Inc.
        !             4: 
        !             5: This file is part of GNU CC.
        !             6: 
        !             7: GNU CC 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: GNU CC 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 GNU CC; see the file COPYING.  If not, write to
        !            19: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            20: 
        !            21: 
        !            22: /* This file defines all the MACHINE MODES used by GNU CC.
        !            23: 
        !            24:    A machine mode specifies a size and format of data
        !            25:    at the machine level.
        !            26: 
        !            27:    Each RTL expression has a machine mode.
        !            28: 
        !            29:    At the syntax tree level, each ..._TYPE and each ..._DECL node
        !            30:    has a machine mode which describes data of that type or the
        !            31:    data of the variable declared.  */
        !            32: 
        !            33: /* The first argument is the internal name of the machine mode
        !            34:    used in the C source.
        !            35:    By convention these are in UPPER_CASE, except for the word  "mode".
        !            36: 
        !            37:    The second argument  is the name of the machine mode in the
        !            38:    external ASCII format used for reading and printing RTL and trees.
        !            39:    By convention these names in UPPER_CASE.
        !            40: 
        !            41:    Third argument states the kind of representation:
        !            42:    MODE_INT - integer
        !            43:    MODE_FLOAT - floating
        !            44:    MODE_PARTIAL_INT - PSImode and PDImode
        !            45:    MODE_CC - modes used for representing the condition code in a register
        !            46:    MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT - complex number
        !            47:    MODE_RANDOM - anything else
        !            48: 
        !            49:    Fourth argument is the relative size of the object, in bytes.
        !            50:    It is zero when the size is meaningless or not determined.
        !            51:    A byte's size is determined by BITS_PER_UNIT in tm.h. 
        !            52: 
        !            53: 
        !            54:    Fifth arg is the relative size of subunits of the object.
        !            55:    It is same as the fourth argument except for complexes,
        !            56:    since they are really made of two equal size subunits.
        !            57: 
        !            58:    Sixth arg is next wider natural mode of the same class.
        !            59:    0 if there is none.  */
        !            60: 
        !            61: /* VOIDmode is used when no mode needs to be specified,
        !            62:    as for example on CONST_INT RTL expressions.  */
        !            63: DEF_MACHMODE (VOIDmode, "VOID", MODE_RANDOM, 0, 0, VOIDmode)
        !            64: 
        !            65: DEF_MACHMODE (QImode, "QI", MODE_INT, 1, 1, HImode)            /* int types */
        !            66: DEF_MACHMODE (HImode, "HI", MODE_INT, 2, 2, SImode)
        !            67: /* Pointers on some machines use this type to distinguish them from ints.
        !            68:    Useful if a pointer is 4 bytes but has some bits that are not significant,
        !            69:    so it is really not quite as wide as an integer.  */
        !            70: DEF_MACHMODE (PSImode, "PSI", MODE_PARTIAL_INT, 4, 4, VOIDmode)
        !            71: DEF_MACHMODE (SImode, "SI", MODE_INT, 4, 4, DImode)
        !            72: DEF_MACHMODE (PDImode, "PDI", MODE_PARTIAL_INT, 8, 8, VOIDmode)
        !            73: DEF_MACHMODE (DImode, "DI", MODE_INT, 8, 8, TImode)
        !            74: DEF_MACHMODE (TImode, "TI", MODE_INT, 16, 16, OImode)
        !            75: DEF_MACHMODE (OImode, "OI", MODE_INT, 32, 32, VOIDmode)
        !            76: 
        !            77: DEF_MACHMODE (QFmode, "QF", MODE_FLOAT, 1, 1, HFmode)
        !            78: DEF_MACHMODE (HFmode, "HF", MODE_FLOAT, 2, 2, SFmode)
        !            79: DEF_MACHMODE (SFmode, "SF", MODE_FLOAT, 4, 4, DFmode)
        !            80: DEF_MACHMODE (DFmode, "DF", MODE_FLOAT, 8, 8, XFmode)
        !            81: DEF_MACHMODE (XFmode, "XF", MODE_FLOAT, 12, 12, TFmode)   /* IEEE extended */
        !            82: DEF_MACHMODE (TFmode, "TF", MODE_FLOAT, 16, 16, VOIDmode)
        !            83: 
        !            84: /* Complex modes.  */
        !            85: DEF_MACHMODE (SCmode, "SC", MODE_COMPLEX_FLOAT, 8, 4, DCmode)
        !            86: DEF_MACHMODE (DCmode, "DC", MODE_COMPLEX_FLOAT, 16, 8, XCmode)
        !            87: DEF_MACHMODE (XCmode, "XC", MODE_COMPLEX_FLOAT, 24, 12, TCmode)
        !            88: DEF_MACHMODE (TCmode, "TC", MODE_COMPLEX_FLOAT, 32, 16, VOIDmode)
        !            89: 
        !            90: DEF_MACHMODE (CQImode, "CQI", MODE_COMPLEX_INT, 2, 1, CHImode)
        !            91: DEF_MACHMODE (CHImode, "CHI", MODE_COMPLEX_INT, 4, 2, CSImode)
        !            92: DEF_MACHMODE (CSImode, "CSI", MODE_COMPLEX_INT, 8, 4, CDImode)
        !            93: DEF_MACHMODE (CDImode, "CDI", MODE_COMPLEX_INT, 16, 8, CTImode)
        !            94: DEF_MACHMODE (CTImode, "CTI", MODE_COMPLEX_INT, 32, 16, COImode)
        !            95: DEF_MACHMODE (COImode, "COI", MODE_COMPLEX_INT, 64, 32, VOIDmode)
        !            96: 
        !            97: /* BLKmode is used for structures, arrays, etc.
        !            98:    that fit no more specific mode.  */
        !            99: DEF_MACHMODE (BLKmode, "BLK", MODE_RANDOM, 0, 0, VOIDmode)
        !           100: 
        !           101: /* The modes for representing the condition codes come last.  CCmode is
        !           102:    always defined.  Additional modes for the condition code can be specified
        !           103:    in the EXTRA_CC_MODES macro.  Everything but the names of the modes
        !           104:    are copied from CCmode.  For these modes, GET_MODE_WIDER_MODE points
        !           105:    to the next defined CC mode, if any.  */
        !           106: 
        !           107: DEF_MACHMODE (CCmode, "CC", MODE_CC, 4, 4, VOIDmode)
        !           108: 
        !           109: /* The symbol Pmode stands for one of the above machine modes (usually SImode).
        !           110:    The tm file specifies which one.  It is not a distinct mode.  */
        !           111: 
        !           112: /*
        !           113: Local variables:
        !           114: mode:c
        !           115: version-control: t
        !           116: End:
        !           117: */

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