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Annotation of gcc/machmode.h, revision 1.1

1.1     ! root        1: /* Machine mode definitions for GNU C-Compiler; included by rtl.h and tree.h.
        !             2:    Copyright (C) 1991  Free Software Foundation, Inc.
        !             3: 
        !             4: This file is part of GNU CC.
        !             5: 
        !             6: GNU CC 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: GNU CC 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 GNU CC; see the file COPYING.  If not, write to
        !            18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            19: 
        !            20: 
        !            21: #ifndef HAVE_MACHINE_MODES
        !            22: 
        !            23: /* Strictly speaking, this isn't the proper place to include these definitions,
        !            24:    but this file is included by every GCC file.
        !            25: 
        !            26:    Some systems define these in, e.g., param.h.  We undefine these names
        !            27:    here to avoid the warnings.  We prefer to use our definitions since we
        !            28:    know they are correct.  */
        !            29: 
        !            30: #undef MIN
        !            31: #undef MAX
        !            32: 
        !            33: #define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
        !            34: #define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
        !            35: 
        !            36: /* Make an enum class that gives all the machine modes.  */
        !            37: 
        !            38: #define DEF_MACHMODE(SYM, NAME, TYPE, SIZE, UNIT, WIDER)  SYM,
        !            39: 
        !            40: enum machine_mode {
        !            41: #include "machmode.def"
        !            42: 
        !            43: #ifdef EXTRA_CC_MODES
        !            44:   EXTRA_CC_MODES,
        !            45: #endif
        !            46: MAX_MACHINE_MODE };
        !            47: 
        !            48: #undef DEF_MACHMODE
        !            49: 
        !            50: #define HAVE_MACHINE_MODES
        !            51: 
        !            52: #ifndef NUM_MACHINE_MODES
        !            53: #define NUM_MACHINE_MODES (int) MAX_MACHINE_MODE
        !            54: #endif
        !            55: 
        !            56: /* Get the name of mode MODE as a string.  */
        !            57: 
        !            58: extern char *mode_name[];
        !            59: #define GET_MODE_NAME(MODE)            (mode_name[(int)(MODE)])
        !            60: 
        !            61: enum mode_class { MODE_RANDOM, MODE_INT, MODE_FLOAT, MODE_PARTIAL_INT, MODE_CC,
        !            62:                  MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT, MAX_MODE_CLASS};
        !            63: 
        !            64: /* Get the general kind of object that mode MODE represents
        !            65:    (integer, floating, complex, etc.)  */
        !            66: 
        !            67: extern enum mode_class mode_class[];
        !            68: #define GET_MODE_CLASS(MODE)           (mode_class[(int)(MODE)])
        !            69: 
        !            70: /* Get the size in bytes of an object of mode MODE.  */
        !            71: 
        !            72: extern int mode_size[];
        !            73: #define GET_MODE_SIZE(MODE)            (mode_size[(int)(MODE)])
        !            74: 
        !            75: /* Get the size in bytes of the basic parts of an object of mode MODE.  */
        !            76: 
        !            77: extern int mode_unit_size[];
        !            78: #define GET_MODE_UNIT_SIZE(MODE)       (mode_unit_size[(int)(MODE)])
        !            79: 
        !            80: /* Get the number of units in the object.  */
        !            81: 
        !            82: #define GET_MODE_NUNITS(MODE)  \
        !            83:   (GET_MODE_SIZE ((MODE)) / GET_MODE_UNIT_SIZE ((MODE)))
        !            84: 
        !            85: /* Get the size in bits of an object of mode MODE.  */
        !            86: 
        !            87: #define GET_MODE_BITSIZE(MODE)  (BITS_PER_UNIT * mode_size[(int)(MODE)])
        !            88: 
        !            89: /* Get a bitmask containing 1 for all bits in a word
        !            90:    that fit within mode MODE.  */
        !            91: 
        !            92: #define GET_MODE_MASK(MODE)  \
        !            93:    ((GET_MODE_BITSIZE (MODE) >= HOST_BITS_PER_INT)  \
        !            94:     ? -1 : ((1 << GET_MODE_BITSIZE (MODE)) - 1))
        !            95: 
        !            96: /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */
        !            97: 
        !            98: extern enum machine_mode mode_wider_mode[];
        !            99: #define GET_MODE_WIDER_MODE(MODE)      (mode_wider_mode[(int)(MODE)])
        !           100: 
        !           101: /* Find the best mode to use to access a bit field.  */
        !           102: 
        !           103: extern enum machine_mode get_best_mode ();
        !           104: 
        !           105: /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */
        !           106: 
        !           107: #define GET_MODE_ALIGNMENT(MODE)   \
        !           108:   MIN (BIGGEST_ALIGNMENT,         \
        !           109:        MAX (1, (GET_MODE_UNIT_SIZE (MODE) * BITS_PER_UNIT)))
        !           110: 
        !           111: /* For each class, get the narrowest mode in that class.  */
        !           112: 
        !           113: extern enum machine_mode class_narrowest_mode[];
        !           114: #define GET_CLASS_NARROWEST_MODE(CLASS) class_narrowest_mode[(int)(CLASS)]
        !           115: 
        !           116: /* Define the integer modes whose sizes are BITS_PER_UNIT
        !           117:    and BITS_PER_WORD.  */
        !           118: 
        !           119: extern enum machine_mode byte_mode;
        !           120: extern enum machine_mode word_mode;
        !           121: 
        !           122: #endif /* not HAVE_MACHINE_MODES */

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