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Annotation of gcc/machmode.h, revision 1.1.1.7

1.1       root        1: /* Machine mode definitions for GNU C-Compiler; included by rtl.h and tree.h.
1.1.1.7 ! root        2:    Copyright (C) 1991, 1993, 1994  Free Software Foundation, Inc.
1.1       root        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
1.1.1.7 ! root       18: the Free Software Foundation, 59 Temple Place - Suite 330,
        !            19: Boston, MA 02111-1307, USA.  */
1.1       root       20: 
                     21: 
1.1.1.4   root       22: /* Add prototype support.  */
                     23: #ifndef PROTO
                     24: #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
                     25: #define PROTO(ARGS) ARGS
                     26: #else
                     27: #define PROTO(ARGS) ()
                     28: #endif
                     29: #endif
                     30: 
1.1       root       31: #ifndef HAVE_MACHINE_MODES
                     32: 
                     33: /* Strictly speaking, this isn't the proper place to include these definitions,
                     34:    but this file is included by every GCC file.
                     35: 
                     36:    Some systems define these in, e.g., param.h.  We undefine these names
                     37:    here to avoid the warnings.  We prefer to use our definitions since we
                     38:    know they are correct.  */
                     39: 
                     40: #undef MIN
                     41: #undef MAX
                     42: 
                     43: #define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
                     44: #define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
                     45: 
1.1.1.3   root       46: /* Find the largest host integer type and set its size and type.  */
                     47: 
                     48: #ifndef HOST_BITS_PER_WIDE_INT
                     49: 
                     50: #if HOST_BITS_PER_LONG > HOST_BITS_PER_INT
                     51: #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_LONG
                     52: #define HOST_WIDE_INT long
                     53: #else
                     54: #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_INT
                     55: #define HOST_WIDE_INT int
                     56: #endif
                     57: 
                     58: #endif
                     59: 
                     60: /* Provide a default way to print an address in hex via printf.  */
                     61: 
                     62: #ifndef HOST_PTR_PRINTF
                     63: #define HOST_PTR_PRINTF sizeof (int) == sizeof (char *) ? "%x" : "%lx"
                     64: #endif
                     65: 
1.1       root       66: /* Make an enum class that gives all the machine modes.  */
                     67: 
                     68: #define DEF_MACHMODE(SYM, NAME, TYPE, SIZE, UNIT, WIDER)  SYM,
                     69: 
                     70: enum machine_mode {
                     71: #include "machmode.def"
                     72: 
                     73: #ifdef EXTRA_CC_MODES
                     74:   EXTRA_CC_MODES,
                     75: #endif
                     76: MAX_MACHINE_MODE };
                     77: 
                     78: #undef DEF_MACHMODE
                     79: 
                     80: #define HAVE_MACHINE_MODES
                     81: 
                     82: #ifndef NUM_MACHINE_MODES
                     83: #define NUM_MACHINE_MODES (int) MAX_MACHINE_MODE
                     84: #endif
                     85: 
                     86: /* Get the name of mode MODE as a string.  */
                     87: 
                     88: extern char *mode_name[];
                     89: #define GET_MODE_NAME(MODE)            (mode_name[(int)(MODE)])
                     90: 
                     91: enum mode_class { MODE_RANDOM, MODE_INT, MODE_FLOAT, MODE_PARTIAL_INT, MODE_CC,
                     92:                  MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT, MAX_MODE_CLASS};
                     93: 
                     94: /* Get the general kind of object that mode MODE represents
                     95:    (integer, floating, complex, etc.)  */
                     96: 
                     97: extern enum mode_class mode_class[];
                     98: #define GET_MODE_CLASS(MODE)           (mode_class[(int)(MODE)])
                     99: 
1.1.1.5   root      100: /* Nonzero if MODE is an integral mode.  */
                    101: #define INTEGRAL_MODE_P(MODE)                  \
                    102:   (GET_MODE_CLASS (MODE) == MODE_INT           \
                    103:    || GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT \
                    104:    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT)
                    105: 
                    106: /* Nonzero if MODE is a floating-point mode.  */
                    107: #define FLOAT_MODE_P(MODE)             \
                    108:   (GET_MODE_CLASS (MODE) == MODE_FLOAT \
                    109:    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT)
                    110: 
1.1       root      111: /* Get the size in bytes of an object of mode MODE.  */
                    112: 
                    113: extern int mode_size[];
                    114: #define GET_MODE_SIZE(MODE)            (mode_size[(int)(MODE)])
                    115: 
                    116: /* Get the size in bytes of the basic parts of an object of mode MODE.  */
                    117: 
                    118: extern int mode_unit_size[];
                    119: #define GET_MODE_UNIT_SIZE(MODE)       (mode_unit_size[(int)(MODE)])
                    120: 
                    121: /* Get the number of units in the object.  */
                    122: 
                    123: #define GET_MODE_NUNITS(MODE)  \
1.1.1.3   root      124:   ((GET_MODE_UNIT_SIZE ((MODE)) == 0) ? 0 \
                    125:    : (GET_MODE_SIZE ((MODE)) / GET_MODE_UNIT_SIZE ((MODE))))
1.1       root      126: 
                    127: /* Get the size in bits of an object of mode MODE.  */
                    128: 
                    129: #define GET_MODE_BITSIZE(MODE)  (BITS_PER_UNIT * mode_size[(int)(MODE)])
                    130: 
                    131: /* Get a bitmask containing 1 for all bits in a word
                    132:    that fit within mode MODE.  */
                    133: 
                    134: #define GET_MODE_MASK(MODE)  \
1.1.1.3   root      135:    ((GET_MODE_BITSIZE (MODE) >= HOST_BITS_PER_WIDE_INT)  \
                    136:     ?(HOST_WIDE_INT) ~0 : (((HOST_WIDE_INT) 1 << GET_MODE_BITSIZE (MODE)) - 1))
1.1       root      137: 
                    138: /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */
                    139: 
                    140: extern enum machine_mode mode_wider_mode[];
                    141: #define GET_MODE_WIDER_MODE(MODE)      (mode_wider_mode[(int)(MODE)])
                    142: 
1.1.1.2   root      143: /* Return the mode for data of a given size SIZE and mode class CLASS.
                    144:    If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
                    145:    The value is BLKmode if no other mode is found.  */
                    146: 
1.1.1.4   root      147: extern enum machine_mode mode_for_size PROTO((unsigned int, enum mode_class, int));
1.1.1.2   root      148: 
1.1       root      149: /* Find the best mode to use to access a bit field.  */
                    150: 
1.1.1.4   root      151: extern enum machine_mode get_best_mode PROTO((int, int, int, enum machine_mode, int));
1.1       root      152: 
                    153: /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */
                    154: 
                    155: #define GET_MODE_ALIGNMENT(MODE)   \
                    156:   MIN (BIGGEST_ALIGNMENT,         \
                    157:        MAX (1, (GET_MODE_UNIT_SIZE (MODE) * BITS_PER_UNIT)))
                    158: 
                    159: /* For each class, get the narrowest mode in that class.  */
                    160: 
                    161: extern enum machine_mode class_narrowest_mode[];
                    162: #define GET_CLASS_NARROWEST_MODE(CLASS) class_narrowest_mode[(int)(CLASS)]
                    163: 
1.1.1.7 ! root      164: /* Define the integer modes whose sizes are BITS_PER_UNIT and BITS_PER_WORD
        !           165:    and the mode whose class is Pmode and whose size is POINTER_SIZE.  */
1.1       root      166: 
                    167: extern enum machine_mode byte_mode;
                    168: extern enum machine_mode word_mode;
1.1.1.7 ! root      169: extern enum machine_mode ptr_mode;
1.1       root      170: 
                    171: #endif /* not HAVE_MACHINE_MODES */

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