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Annotation of gcc/hard-reg-set.h, revision 1.1

1.1     ! root        1: /* Sets (bit vectors) of hard registers, and operations on them.
        !             2:    Copyright (C) 1987 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: /* Define the type of a set of hard registers.  */
        !            22: 
        !            23: /* If HARD_REG_SET is a macro, its definition is a scalar type
        !            24:    that has enough bits for all the target machine's hard registers.
        !            25:    Otherwise, it is a typedef for a suitable array of longs,
        !            26:    and HARD_REG_SET_LONGS is how many.  */
        !            27: 
        !            28: #ifndef HOST_BITS_PER_LONG_LONG
        !            29: #define HOST_BITS_PER_LONG_LONG (2 * HOST_BITS_PER_LONG)
        !            30: #endif
        !            31: 
        !            32: #if FIRST_PSEUDO_REGISTER <= HOST_BITS_PER_CHAR
        !            33: #define HARD_REG_SET char
        !            34: #else
        !            35: #if FIRST_PSEUDO_REGISTER <= HOST_BITS_PER_SHORT
        !            36: #define HARD_REG_SET short
        !            37: #else
        !            38: #if FIRST_PSEUDO_REGISTER <= HOST_BITS_PER_INT
        !            39: #define HARD_REG_SET int
        !            40: #else
        !            41: #if FIRST_PSEUDO_REGISTER <= HOST_BITS_PER_LONG
        !            42: #define HARD_REG_SET long
        !            43: #else
        !            44: #if 0 && defined (__GNUC__) && FIRST_PSEUDO_REGISTER <= HOST_BITS_PER_LONGLONG
        !            45: #define HARD_REG_SET long long
        !            46: #else
        !            47: #define HARD_REG_SET_LONGS \
        !            48:  ((FIRST_PSEUDO_REGISTER + HOST_BITS_PER_LONG - 1) / HOST_BITS_PER_LONG)
        !            49: typedef long HARD_REG_SET[HARD_REG_SET_LONGS];
        !            50: #endif
        !            51: #endif
        !            52: #endif
        !            53: #endif
        !            54: #endif
        !            55: 
        !            56: /* HARD_CONST is used to cast a constant to a HARD_REG_SET
        !            57:    if that is a scalar wider than an integer.  */
        !            58: 
        !            59: #ifdef HARD_REG_SET
        !            60: #define HARD_CONST(X) ((HARD_REG_SET) (X))
        !            61: #else
        !            62: #define HARD_CONST(X) (X)
        !            63: #endif
        !            64: 
        !            65: /* Define macros SET_HARD_REG_BIT, CLEAR_HARD_REG_BIT and TEST_HARD_REG_BIT
        !            66:    to set, clear or test one bit in a hard reg set of type HARD_REG_SET.
        !            67:    All three take two arguments: the set and the register number.
        !            68: 
        !            69:    In the case where sets are arrays of longs, the first argument
        !            70:    is actually a pointer to a long.
        !            71: 
        !            72:    Define two macros for initializing a set:
        !            73:    CLEAR_HARD_REG_SET and SET_HARD_REG_SET.
        !            74:    These take just one argument.
        !            75: 
        !            76:    Also define macros for copying hard reg sets:
        !            77:    COPY_HARD_REG_SET and COMPL_HARD_REG_SET.
        !            78:    These take two arguments TO and FROM; they read from FROM
        !            79:    and store into TO.  COMPL_HARD_REG_SET complements each bit.
        !            80: 
        !            81:    Also define macros for combining hard reg sets:
        !            82:    IOR_HARD_REG_SET and AND_HARD_REG_SET.
        !            83:    These take two arguments TO and FROM; they read from FROM
        !            84:    and combine bitwise into TO.  Define also two variants
        !            85:    IOR_COMPL_HARD_REG_SET and AND_COMPL_HARD_REG_SET
        !            86:    which use the complement of the set FROM.
        !            87: 
        !            88:    Also define GO_IF_HARD_REG_SUBSET (X, Y, TO):
        !            89:    if X is a subset of Y, go to TO.
        !            90: */
        !            91: 
        !            92: #ifdef HARD_REG_SET
        !            93: 
        !            94: #define SET_HARD_REG_BIT(SET, BIT)  \
        !            95:  ((SET) |= HARD_CONST (1) << (BIT))
        !            96: #define CLEAR_HARD_REG_BIT(SET, BIT)  \
        !            97:  ((SET) &= ~(HARD_CONST (1) << (BIT)))
        !            98: #define TEST_HARD_REG_BIT(SET, BIT)  \
        !            99:  ((SET) & (HARD_CONST (1) << (BIT)))
        !           100: 
        !           101: #define CLEAR_HARD_REG_SET(TO) ((TO) = HARD_CONST (0))
        !           102: #define SET_HARD_REG_SET(TO) ((TO) = HARD_CONST (-1))
        !           103: 
        !           104: #define COPY_HARD_REG_SET(TO, FROM) ((TO) = (FROM))
        !           105: #define COMPL_HARD_REG_SET(TO, FROM) ((TO) = ~(FROM))
        !           106: 
        !           107: #define IOR_HARD_REG_SET(TO, FROM) ((TO) |= (FROM))
        !           108: #define IOR_COMPL_HARD_REG_SET(TO, FROM) ((TO) |= ~ (FROM))
        !           109: #define AND_HARD_REG_SET(TO, FROM) ((TO) &= (FROM))
        !           110: #define AND_COMPL_HARD_REG_SET(TO, FROM) ((TO) &= ~ (FROM))
        !           111: 
        !           112: #define GO_IF_HARD_REG_SUBSET(X,Y,TO) if (HARD_CONST (0) == ((X) & ~(Y))) goto TO
        !           113: 
        !           114: #define GO_IF_HARD_REG_EQUAL(X,Y,TO) if ((X) == (Y)) goto TO
        !           115: #else
        !           116: 
        !           117: #define UHOST_BITS_PER_LONG ((unsigned) HOST_BITS_PER_LONG)
        !           118: 
        !           119: #define SET_HARD_REG_BIT(SET, BIT)  \
        !           120:   ((SET)[(BIT) / UHOST_BITS_PER_LONG] |= 1 << ((BIT) % UHOST_BITS_PER_LONG))
        !           121: #define CLEAR_HARD_REG_BIT(SET, BIT)  \
        !           122:   ((SET)[(BIT) / UHOST_BITS_PER_LONG] &= ~(1 << ((BIT) % UHOST_BITS_PER_LONG)))
        !           123: #define TEST_HARD_REG_BIT(SET, BIT)  \
        !           124:   ((SET)[(BIT) / UHOST_BITS_PER_LONG] & (1 << ((BIT) % UHOST_BITS_PER_LONG)))
        !           125: 
        !           126: #define CLEAR_HARD_REG_SET(TO)  \
        !           127: do { register long *scan_tp_ = (TO);                           \
        !           128:      register int i;                                           \
        !           129:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           130:        *scan_tp_++ = 0; } while (0)
        !           131: 
        !           132: #define SET_HARD_REG_SET(TO)  \
        !           133: do { register long *scan_tp_ = (TO);                           \
        !           134:      register int i;                                           \
        !           135:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           136:        *scan_tp_++ = -1; } while (0)
        !           137: 
        !           138: #define COPY_HARD_REG_SET(TO, FROM)  \
        !           139: do { register long *scan_tp_ = (TO), *scan_fp_ = (FROM);       \
        !           140:      register int i;                                           \
        !           141:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           142:        *scan_tp_++ = *scan_fp_++; } while (0)
        !           143: 
        !           144: #define COMPL_HARD_REG_SET(TO, FROM)  \
        !           145: do { register long *scan_tp_ = (TO), *scan_fp_ = (FROM);       \
        !           146:      register int i;                                           \
        !           147:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           148:        *scan_tp_++ = ~ *scan_fp_++; } while (0)
        !           149: 
        !           150: #define AND_HARD_REG_SET(TO, FROM)  \
        !           151: do { register long *scan_tp_ = (TO), *scan_fp_ = (FROM);       \
        !           152:      register int i;                                           \
        !           153:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           154:        *scan_tp_++ &= *scan_fp_++; } while (0)
        !           155: 
        !           156: #define AND_COMPL_HARD_REG_SET(TO, FROM)  \
        !           157: do { register long *scan_tp_ = (TO), *scan_fp_ = (FROM);       \
        !           158:      register int i;                                           \
        !           159:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           160:        *scan_tp_++ &= ~ *scan_fp_++; } while (0)
        !           161: 
        !           162: #define IOR_HARD_REG_SET(TO, FROM)  \
        !           163: do { register long *scan_tp_ = (TO), *scan_fp_ = (FROM);       \
        !           164:      register int i;                                           \
        !           165:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           166:        *scan_tp_++ |= *scan_fp_++; } while (0)
        !           167: 
        !           168: #define IOR_COMPL_HARD_REG_SET(TO, FROM)  \
        !           169: do { register long *scan_tp_ = (TO), *scan_fp_ = (FROM);       \
        !           170:      register int i;                                           \
        !           171:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           172:        *scan_tp_++ |= ~ *scan_fp_++; } while (0)
        !           173: 
        !           174: #define GO_IF_HARD_REG_SUBSET(X,Y,TO)  \
        !           175: do { register long *scan_xp_ = (X), *scan_yp_ = (Y);           \
        !           176:      register int i;                                           \
        !           177:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           178:        if (0 != (*scan_xp_++ & ~*scan_yp_++)) break;           \
        !           179:      if (i == HARD_REG_SET_LONGS) goto TO; } while (0)
        !           180: 
        !           181: #define GO_IF_HARD_REG_EQUAL(X,Y,TO)  \
        !           182: do { register long *scan_xp_ = (X), *scan_yp_ = (Y);           \
        !           183:      register int i;                                           \
        !           184:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           185:        if (*scan_xp_++ != ~*scan_yp_++)) break;                        \
        !           186:      if (i == HARD_REG_SET_LONGS) goto TO; } while (0)
        !           187: 
        !           188: #endif
        !           189: 
        !           190: /* Define some standard sets of registers.  */
        !           191: 
        !           192: /* Indexed by hard register number, contains 1 for registers
        !           193:    that are fixed use (stack pointer, pc, frame pointer, etc.).
        !           194:    These are the registers that cannot be used to allocate
        !           195:    a pseudo reg whose life does not cross calls.  */
        !           196: 
        !           197: extern char fixed_regs[FIRST_PSEUDO_REGISTER];
        !           198: 
        !           199: /* The same info as a HARD_REG_SET.  */
        !           200: 
        !           201: extern HARD_REG_SET fixed_reg_set;
        !           202: 
        !           203: /* Indexed by hard register number, contains 1 for registers
        !           204:    that are fixed use or are clobbered by function calls.
        !           205:    These are the registers that cannot be used to allocate
        !           206:    a pseudo reg whose life crosses calls.  */
        !           207: 
        !           208: extern char call_used_regs[FIRST_PSEUDO_REGISTER];
        !           209: 
        !           210: /* The same info as a HARD_REG_SET.  */
        !           211: 
        !           212: extern HARD_REG_SET call_used_reg_set;
        !           213:   
        !           214: /* Indexed by hard register number, contains 1 for registers that are
        !           215:    fixed use -- i.e. in fixed_regs -- or a function value return register
        !           216:    or STRUCT_VALUE_REGNUM or STATIC_CHAIN_REGNUM.  These are the
        !           217:    registers that cannot hold quantities across calls even if we are
        !           218:    willing to save and restore them.  */
        !           219: 
        !           220: extern char call_fixed_regs[FIRST_PSEUDO_REGISTER];
        !           221: 
        !           222: /* The same info as a HARD_REG_SET.  */
        !           223: 
        !           224: extern HARD_REG_SET call_fixed_reg_set;
        !           225: 
        !           226: /* Indexed by hard register number, contains 1 for registers
        !           227:    that are being used for global register decls.
        !           228:    These must be exempt from ordinary flow analysis
        !           229:    and are also considered fixed.  */
        !           230: 
        !           231: extern char global_regs[FIRST_PSEUDO_REGISTER];
        !           232: 
        !           233: /* Table of register numbers in the order in which to try to use them.  */
        !           234: 
        !           235: #ifdef REG_ALLOC_ORDER   /* Avoid undef symbol in certain broken linkers.  */
        !           236: extern int reg_alloc_order[FIRST_PSEUDO_REGISTER];
        !           237: #endif
        !           238: 
        !           239: /* For each reg class, a HARD_REG_SET saying which registers are in it.  */
        !           240: 
        !           241: extern HARD_REG_SET reg_class_contents[];
        !           242: 
        !           243: /* For each reg class, number of regs it contains.  */
        !           244: 
        !           245: extern int reg_class_size[N_REG_CLASSES];
        !           246: 
        !           247: /* For each reg class, table listing all the containing classes.  */
        !           248: 
        !           249: extern enum reg_class reg_class_superclasses[N_REG_CLASSES][N_REG_CLASSES];
        !           250: 
        !           251: /* For each reg class, table listing all the classes contained in it.  */
        !           252: 
        !           253: extern enum reg_class reg_class_subclasses[N_REG_CLASSES][N_REG_CLASSES];
        !           254: 
        !           255: /* For each pair of reg classes,
        !           256:    a largest reg class contained in their union.  */
        !           257: 
        !           258: extern enum reg_class reg_class_subunion[N_REG_CLASSES][N_REG_CLASSES];
        !           259: 
        !           260: /* For each pair of reg classes,
        !           261:    the smallest reg class that contains their union.  */
        !           262: 
        !           263: extern enum reg_class reg_class_superunion[N_REG_CLASSES][N_REG_CLASSES];
        !           264: 
        !           265: /* Number of non-fixed registers.  */
        !           266: 
        !           267: extern int n_non_fixed_regs;
        !           268: 
        !           269: /* Vector indexed by hardware reg giving its name.  */
        !           270: 
        !           271: extern char *reg_names[FIRST_PSEUDO_REGISTER];

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