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Annotation of gcc/machmode.h, revision 1.1.1.5

1.1       root        1: /* Machine mode definitions for GNU C-Compiler; included by rtl.h and tree.h.
1.1.1.5 ! root        2:    Copyright (C) 1991, 1993  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
                     18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
                     19: 
                     20: 
1.1.1.4   root       21: /* Add prototype support.  */
                     22: #ifndef PROTO
                     23: #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
                     24: #define PROTO(ARGS) ARGS
                     25: #else
                     26: #define PROTO(ARGS) ()
                     27: #endif
                     28: #endif
                     29: 
1.1       root       30: #ifndef HAVE_MACHINE_MODES
                     31: 
                     32: /* Strictly speaking, this isn't the proper place to include these definitions,
                     33:    but this file is included by every GCC file.
                     34: 
                     35:    Some systems define these in, e.g., param.h.  We undefine these names
                     36:    here to avoid the warnings.  We prefer to use our definitions since we
                     37:    know they are correct.  */
                     38: 
                     39: #undef MIN
                     40: #undef MAX
                     41: 
                     42: #define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
                     43: #define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
                     44: 
1.1.1.3   root       45: /* Find the largest host integer type and set its size and type.  */
                     46: 
                     47: #ifndef HOST_BITS_PER_WIDE_INT
                     48: 
                     49: #if HOST_BITS_PER_LONG > HOST_BITS_PER_INT
                     50: #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_LONG
                     51: #define HOST_WIDE_INT long
                     52: #else
                     53: #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_INT
                     54: #define HOST_WIDE_INT int
                     55: #endif
                     56: 
                     57: #endif
                     58: 
                     59: /* Define the number of entries in an 8-bit `shorts' array needed to represent
                     60:    the largest supported constant, which is twice the width of the largest
                     61:    host integer type.  */
                     62: 
                     63: #ifndef MAX_SHORTS
                     64: #define MAX_SHORTS (HOST_BITS_PER_WIDE_INT * 2 / 8)
                     65: #endif
                     66: 
                     67: /* Provide a default way to print an address in hex via printf.  */
                     68: 
                     69: #ifndef HOST_PTR_PRINTF
                     70: #define HOST_PTR_PRINTF sizeof (int) == sizeof (char *) ? "%x" : "%lx"
                     71: #endif
                     72: 
1.1       root       73: /* Make an enum class that gives all the machine modes.  */
                     74: 
                     75: #define DEF_MACHMODE(SYM, NAME, TYPE, SIZE, UNIT, WIDER)  SYM,
                     76: 
                     77: enum machine_mode {
                     78: #include "machmode.def"
                     79: 
                     80: #ifdef EXTRA_CC_MODES
                     81:   EXTRA_CC_MODES,
                     82: #endif
                     83: MAX_MACHINE_MODE };
                     84: 
                     85: #undef DEF_MACHMODE
                     86: 
                     87: #define HAVE_MACHINE_MODES
                     88: 
                     89: #ifndef NUM_MACHINE_MODES
                     90: #define NUM_MACHINE_MODES (int) MAX_MACHINE_MODE
                     91: #endif
                     92: 
                     93: /* Get the name of mode MODE as a string.  */
                     94: 
                     95: extern char *mode_name[];
                     96: #define GET_MODE_NAME(MODE)            (mode_name[(int)(MODE)])
                     97: 
                     98: enum mode_class { MODE_RANDOM, MODE_INT, MODE_FLOAT, MODE_PARTIAL_INT, MODE_CC,
                     99:                  MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT, MAX_MODE_CLASS};
                    100: 
                    101: /* Get the general kind of object that mode MODE represents
                    102:    (integer, floating, complex, etc.)  */
                    103: 
                    104: extern enum mode_class mode_class[];
                    105: #define GET_MODE_CLASS(MODE)           (mode_class[(int)(MODE)])
                    106: 
1.1.1.5 ! root      107: /* Nonzero if MODE is an integral mode.  */
        !           108: #define INTEGRAL_MODE_P(MODE)                  \
        !           109:   (GET_MODE_CLASS (MODE) == MODE_INT           \
        !           110:    || GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT \
        !           111:    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT)
        !           112: 
        !           113: /* Nonzero if MODE is a floating-point mode.  */
        !           114: #define FLOAT_MODE_P(MODE)             \
        !           115:   (GET_MODE_CLASS (MODE) == MODE_FLOAT \
        !           116:    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT)
        !           117: 
1.1       root      118: /* Get the size in bytes of an object of mode MODE.  */
                    119: 
                    120: extern int mode_size[];
                    121: #define GET_MODE_SIZE(MODE)            (mode_size[(int)(MODE)])
                    122: 
                    123: /* Get the size in bytes of the basic parts of an object of mode MODE.  */
                    124: 
                    125: extern int mode_unit_size[];
                    126: #define GET_MODE_UNIT_SIZE(MODE)       (mode_unit_size[(int)(MODE)])
                    127: 
                    128: /* Get the number of units in the object.  */
                    129: 
                    130: #define GET_MODE_NUNITS(MODE)  \
1.1.1.3   root      131:   ((GET_MODE_UNIT_SIZE ((MODE)) == 0) ? 0 \
                    132:    : (GET_MODE_SIZE ((MODE)) / GET_MODE_UNIT_SIZE ((MODE))))
1.1       root      133: 
                    134: /* Get the size in bits of an object of mode MODE.  */
                    135: 
                    136: #define GET_MODE_BITSIZE(MODE)  (BITS_PER_UNIT * mode_size[(int)(MODE)])
                    137: 
                    138: /* Get a bitmask containing 1 for all bits in a word
                    139:    that fit within mode MODE.  */
                    140: 
                    141: #define GET_MODE_MASK(MODE)  \
1.1.1.3   root      142:    ((GET_MODE_BITSIZE (MODE) >= HOST_BITS_PER_WIDE_INT)  \
                    143:     ?(HOST_WIDE_INT) ~0 : (((HOST_WIDE_INT) 1 << GET_MODE_BITSIZE (MODE)) - 1))
1.1       root      144: 
                    145: /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */
                    146: 
                    147: extern enum machine_mode mode_wider_mode[];
                    148: #define GET_MODE_WIDER_MODE(MODE)      (mode_wider_mode[(int)(MODE)])
                    149: 
1.1.1.2   root      150: /* Return the mode for data of a given size SIZE and mode class CLASS.
                    151:    If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
                    152:    The value is BLKmode if no other mode is found.  */
                    153: 
1.1.1.4   root      154: extern enum machine_mode mode_for_size PROTO((unsigned int, enum mode_class, int));
1.1.1.2   root      155: 
1.1       root      156: /* Find the best mode to use to access a bit field.  */
                    157: 
1.1.1.4   root      158: extern enum machine_mode get_best_mode PROTO((int, int, int, enum machine_mode, int));
1.1       root      159: 
                    160: /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */
                    161: 
                    162: #define GET_MODE_ALIGNMENT(MODE)   \
                    163:   MIN (BIGGEST_ALIGNMENT,         \
                    164:        MAX (1, (GET_MODE_UNIT_SIZE (MODE) * BITS_PER_UNIT)))
                    165: 
                    166: /* For each class, get the narrowest mode in that class.  */
                    167: 
                    168: extern enum machine_mode class_narrowest_mode[];
                    169: #define GET_CLASS_NARROWEST_MODE(CLASS) class_narrowest_mode[(int)(CLASS)]
                    170: 
                    171: /* Define the integer modes whose sizes are BITS_PER_UNIT
                    172:    and BITS_PER_WORD.  */
                    173: 
                    174: extern enum machine_mode byte_mode;
                    175: extern enum machine_mode word_mode;
                    176: 
                    177: #endif /* not HAVE_MACHINE_MODES */

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