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Annotation of gcc/machmode.h, revision 1.1.1.1

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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