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Annotation of GNUtools/cc/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, 1992 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: /* HARD_REG_ELT_TYPE is a typedef of the unsigned integral type which
        !            24:    will be used for hard reg sets, either alone or in an array.
        !            25: 
        !            26:    If HARD_REG_SET is a macro, its definition is HARD_REG_ELT_TYPE,
        !            27:    and it has enough bits to represent all the target machine's hard
        !            28:    registers.  Otherwise, it is a typedef for a suitably sized array
        !            29:    of HARD_REG_ELT_TYPEs.  HARD_REG_SET_LONGS is defined as how many.
        !            30: 
        !            31:    Note that lots of code assumes that the first part of a regset is
        !            32:    the same format as a HARD_REG_SET.  To help make sure this is true,
        !            33:    we only try the widest integer mode (HOST_WIDE_INT) instead of all the
        !            34:    smaller types.  This approach loses only if there are a very few
        !            35:    registers and then only in the few cases where we have an array of
        !            36:    HARD_REG_SETs, so it needn't be as complex as it used to be.  */
        !            37: 
        !            38: typedef unsigned HOST_WIDE_INT HARD_REG_ELT_TYPE;
        !            39: 
        !            40: #if FIRST_PSEUDO_REGISTER <= HOST_BITS_PER_WIDE_INT
        !            41: 
        !            42: #define HARD_REG_SET HARD_REG_ELT_TYPE
        !            43: 
        !            44: #else
        !            45: 
        !            46: #define HARD_REG_SET_LONGS \
        !            47:  ((FIRST_PSEUDO_REGISTER + HOST_BITS_PER_WIDE_INT - 1) \
        !            48:   / HOST_BITS_PER_WIDE_INT)
        !            49: typedef HARD_REG_ELT_TYPE HARD_REG_SET[HARD_REG_SET_LONGS];
        !            50: 
        !            51: #endif
        !            52: 
        !            53: /* HARD_CONST is used to cast a constant to the appropriate type
        !            54:    for use with a HARD_REG_SET.  */
        !            55: 
        !            56: #define HARD_CONST(X) ((HARD_REG_ELT_TYPE) (X))
        !            57: 
        !            58: /* Define macros SET_HARD_REG_BIT, CLEAR_HARD_REG_BIT and TEST_HARD_REG_BIT
        !            59:    to set, clear or test one bit in a hard reg set of type HARD_REG_SET.
        !            60:    All three take two arguments: the set and the register number.
        !            61: 
        !            62:    In the case where sets are arrays of longs, the first argument
        !            63:    is actually a pointer to a long.
        !            64: 
        !            65:    Define two macros for initializing a set:
        !            66:    CLEAR_HARD_REG_SET and SET_HARD_REG_SET.
        !            67:    These take just one argument.
        !            68: 
        !            69:    Also define macros for copying hard reg sets:
        !            70:    COPY_HARD_REG_SET and COMPL_HARD_REG_SET.
        !            71:    These take two arguments TO and FROM; they read from FROM
        !            72:    and store into TO.  COMPL_HARD_REG_SET complements each bit.
        !            73: 
        !            74:    Also define macros for combining hard reg sets:
        !            75:    IOR_HARD_REG_SET and AND_HARD_REG_SET.
        !            76:    These take two arguments TO and FROM; they read from FROM
        !            77:    and combine bitwise into TO.  Define also two variants
        !            78:    IOR_COMPL_HARD_REG_SET and AND_COMPL_HARD_REG_SET
        !            79:    which use the complement of the set FROM.
        !            80: 
        !            81:    Also define GO_IF_HARD_REG_SUBSET (X, Y, TO):
        !            82:    if X is a subset of Y, go to TO.
        !            83: */
        !            84: 
        !            85: #ifdef HARD_REG_SET
        !            86: 
        !            87: #define SET_HARD_REG_BIT(SET, BIT)  \
        !            88:  ((SET) |= HARD_CONST (1) << (BIT))
        !            89: #define CLEAR_HARD_REG_BIT(SET, BIT)  \
        !            90:  ((SET) &= ~(HARD_CONST (1) << (BIT)))
        !            91: #define TEST_HARD_REG_BIT(SET, BIT)  \
        !            92:  ((SET) & (HARD_CONST (1) << (BIT)))
        !            93: 
        !            94: #define CLEAR_HARD_REG_SET(TO) ((TO) = HARD_CONST (0))
        !            95: #define SET_HARD_REG_SET(TO) ((TO) = ~ HARD_CONST (0))
        !            96: 
        !            97: #define COPY_HARD_REG_SET(TO, FROM) ((TO) = (FROM))
        !            98: #define COMPL_HARD_REG_SET(TO, FROM) ((TO) = ~(FROM))
        !            99: 
        !           100: #define IOR_HARD_REG_SET(TO, FROM) ((TO) |= (FROM))
        !           101: #define IOR_COMPL_HARD_REG_SET(TO, FROM) ((TO) |= ~ (FROM))
        !           102: #define AND_HARD_REG_SET(TO, FROM) ((TO) &= (FROM))
        !           103: #define AND_COMPL_HARD_REG_SET(TO, FROM) ((TO) &= ~ (FROM))
        !           104: 
        !           105: #define GO_IF_HARD_REG_SUBSET(X,Y,TO) if (HARD_CONST (0) == ((X) & ~(Y))) goto TO
        !           106: 
        !           107: #define GO_IF_HARD_REG_EQUAL(X,Y,TO) if ((X) == (Y)) goto TO
        !           108: 
        !           109: #else
        !           110: 
        !           111: #define UHOST_BITS_PER_WIDE_INT ((unsigned) HOST_BITS_PER_WIDE_INT)
        !           112: 
        !           113: #define SET_HARD_REG_BIT(SET, BIT)             \
        !           114:   ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT]      \
        !           115:    |= HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT))
        !           116: 
        !           117: #define CLEAR_HARD_REG_BIT(SET, BIT)           \
        !           118:   ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT]      \
        !           119:    &= ~(HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT)))
        !           120: 
        !           121: #define TEST_HARD_REG_BIT(SET, BIT)            \
        !           122:   ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT]      \
        !           123:    & (HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT)))
        !           124: 
        !           125: #define CLEAR_HARD_REG_SET(TO)  \
        !           126: do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO);              \
        !           127:      register int i;                                           \
        !           128:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           129:        *scan_tp_++ = 0; } while (0)
        !           130: 
        !           131: #define SET_HARD_REG_SET(TO)  \
        !           132: do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO);              \
        !           133:      register int i;                                           \
        !           134:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           135:        *scan_tp_++ = -1; } while (0)
        !           136: 
        !           137: #define COPY_HARD_REG_SET(TO, FROM)  \
        !           138: do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
        !           139:      register int i;                                           \
        !           140:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           141:        *scan_tp_++ = *scan_fp_++; } while (0)
        !           142: 
        !           143: #define COMPL_HARD_REG_SET(TO, FROM)  \
        !           144: do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
        !           145:      register int i;                                           \
        !           146:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           147:        *scan_tp_++ = ~ *scan_fp_++; } while (0)
        !           148: 
        !           149: #define AND_HARD_REG_SET(TO, FROM)  \
        !           150: do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
        !           151:      register int i;                                           \
        !           152:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           153:        *scan_tp_++ &= *scan_fp_++; } while (0)
        !           154: 
        !           155: #define AND_COMPL_HARD_REG_SET(TO, FROM)  \
        !           156: do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
        !           157:      register int i;                                           \
        !           158:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           159:        *scan_tp_++ &= ~ *scan_fp_++; } while (0)
        !           160: 
        !           161: #define IOR_HARD_REG_SET(TO, FROM)  \
        !           162: do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
        !           163:      register int i;                                           \
        !           164:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           165:        *scan_tp_++ |= *scan_fp_++; } while (0)
        !           166: 
        !           167: #define IOR_COMPL_HARD_REG_SET(TO, FROM)  \
        !           168: do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
        !           169:      register int i;                                           \
        !           170:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           171:        *scan_tp_++ |= ~ *scan_fp_++; } while (0)
        !           172: 
        !           173: #define GO_IF_HARD_REG_SUBSET(X,Y,TO)  \
        !           174: do { register HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
        !           175:      register int i;                                           \
        !           176:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           177:        if (0 != (*scan_xp_++ & ~ *scan_yp_++)) break;          \
        !           178:      if (i == HARD_REG_SET_LONGS) goto TO; } while (0)
        !           179: 
        !           180: #define GO_IF_HARD_REG_EQUAL(X,Y,TO)  \
        !           181: do { register HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
        !           182:      register int i;                                           \
        !           183:      for (i = 0; i < HARD_REG_SET_LONGS; i++)                  \
        !           184:        if (*scan_xp_++ != ~ *scan_yp_++)) break;               \
        !           185:      if (i == HARD_REG_SET_LONGS) goto TO; } while (0)
        !           186: 
        !           187: #endif
        !           188: 
        !           189: /* Define some standard sets of registers.  */
        !           190: 
        !           191: /* Indexed by hard register number, contains 1 for registers
        !           192:    that are fixed use (stack pointer, pc, frame pointer, etc.).
        !           193:    These are the registers that cannot be used to allocate
        !           194:    a pseudo reg whose life does not cross calls.  */
        !           195: 
        !           196: extern char fixed_regs[FIRST_PSEUDO_REGISTER];
        !           197: 
        !           198: /* The same info as a HARD_REG_SET.  */
        !           199: 
        !           200: extern HARD_REG_SET fixed_reg_set;
        !           201: 
        !           202: /* Indexed by hard register number, contains 1 for registers
        !           203:    that are fixed use or are clobbered by function calls.
        !           204:    These are the registers that cannot be used to allocate
        !           205:    a pseudo reg whose life crosses calls.  */
        !           206: 
        !           207: extern char call_used_regs[FIRST_PSEUDO_REGISTER];
        !           208: 
        !           209: /* The same info as a HARD_REG_SET.  */
        !           210: 
        !           211: extern HARD_REG_SET call_used_reg_set;
        !           212:   
        !           213: /* Indexed by hard register number, contains 1 for registers that are
        !           214:    fixed use -- i.e. in fixed_regs -- or a function value return register
        !           215:    or STRUCT_VALUE_REGNUM or STATIC_CHAIN_REGNUM.  These are the
        !           216:    registers that cannot hold quantities across calls even if we are
        !           217:    willing to save and restore them.  */
        !           218: 
        !           219: extern char call_fixed_regs[FIRST_PSEUDO_REGISTER];
        !           220: 
        !           221: /* The same info as a HARD_REG_SET.  */
        !           222: 
        !           223: extern HARD_REG_SET call_fixed_reg_set;
        !           224: 
        !           225: /* Indexed by hard register number, contains 1 for registers
        !           226:    that are being used for global register decls.
        !           227:    These must be exempt from ordinary flow analysis
        !           228:    and are also considered fixed.  */
        !           229: 
        !           230: extern char global_regs[FIRST_PSEUDO_REGISTER];
        !           231: 
        !           232: /* Table of register numbers in the order in which to try to use them.  */
        !           233: 
        !           234: #ifdef REG_ALLOC_ORDER   /* Avoid undef symbol in certain broken linkers.  */
        !           235: extern int reg_alloc_order[FIRST_PSEUDO_REGISTER];
        !           236: #endif
        !           237: 
        !           238: /* For each reg class, a HARD_REG_SET saying which registers are in it.  */
        !           239: 
        !           240: extern HARD_REG_SET reg_class_contents[];
        !           241: 
        !           242: /* For each reg class, number of regs it contains.  */
        !           243: 
        !           244: extern int reg_class_size[N_REG_CLASSES];
        !           245: 
        !           246: /* For each reg class, table listing all the containing classes.  */
        !           247: 
        !           248: extern enum reg_class reg_class_superclasses[N_REG_CLASSES][N_REG_CLASSES];
        !           249: 
        !           250: /* For each reg class, table listing all the classes contained in it.  */
        !           251: 
        !           252: extern enum reg_class reg_class_subclasses[N_REG_CLASSES][N_REG_CLASSES];
        !           253: 
        !           254: /* For each pair of reg classes,
        !           255:    a largest reg class contained in their union.  */
        !           256: 
        !           257: extern enum reg_class reg_class_subunion[N_REG_CLASSES][N_REG_CLASSES];
        !           258: 
        !           259: /* For each pair of reg classes,
        !           260:    the smallest reg class that contains their union.  */
        !           261: 
        !           262: extern enum reg_class reg_class_superunion[N_REG_CLASSES][N_REG_CLASSES];
        !           263: 
        !           264: /* Number of non-fixed registers.  */
        !           265: 
        !           266: extern int n_non_fixed_regs;
        !           267: 
        !           268: /* Vector indexed by hardware reg giving its name.  */
        !           269: 
        !           270: extern char *reg_names[FIRST_PSEUDO_REGISTER];

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