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Annotation of gcc/reload.h, revision 1.1

1.1     ! root        1: /* Communication between reload.c and reload1.c.
        !             2:    Copyright (C) 1987, 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: /* If secondary reloads are the same for inputs and outputs, define those
        !            22:    macros here.  */
        !            23: 
        !            24: #ifdef SECONDARY_RELOAD_CLASS
        !            25: #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
        !            26:   SECONDARY_RELOAD_CLASS (CLASS, MODE, X)
        !            27: #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
        !            28:   SECONDARY_RELOAD_CLASS (CLASS, MODE, X)
        !            29: #endif
        !            30: 
        !            31: /* If either macro is defined, show that we need secondary reloads.  */
        !            32: #if defined(SECONDARY_INPUT_RELOAD_CLASS) || defined(SECONDARY_OUTPUT_RELOAD_CLASS)
        !            33: #define HAVE_SECONDARY_RELOADS
        !            34: #endif
        !            35: 
        !            36: /* See reload.c and reload1.c for comments on these variables.  */
        !            37: 
        !            38: /* Maximum number of reloads we can need.  */
        !            39: #define MAX_RELOADS (2 * MAX_RECOG_OPERANDS * (MAX_REGS_PER_ADDRESS + 1))
        !            40: 
        !            41: extern rtx reload_in[MAX_RELOADS];
        !            42: extern rtx reload_out[MAX_RELOADS];
        !            43: extern rtx reload_in_reg[MAX_RELOADS];
        !            44: extern enum reg_class reload_reg_class[MAX_RELOADS];
        !            45: extern enum machine_mode reload_inmode[MAX_RELOADS];
        !            46: extern enum machine_mode reload_outmode[MAX_RELOADS];
        !            47: extern char reload_strict_low[MAX_RELOADS];
        !            48: extern char reload_optional[MAX_RELOADS];
        !            49: extern int reload_inc[MAX_RELOADS];
        !            50: extern int reload_needed_for_multiple[MAX_RELOADS];
        !            51: extern rtx reload_needed_for[MAX_RELOADS];
        !            52: extern int reload_secondary_reload[MAX_RELOADS];
        !            53: extern int reload_secondary_p[MAX_RELOADS];
        !            54: #ifdef MAX_INSN_CODE
        !            55: extern enum insn_code reload_secondary_icode[MAX_RELOADS];
        !            56: #endif
        !            57: extern int n_reloads;
        !            58: 
        !            59: extern rtx reload_reg_rtx[MAX_RELOADS];
        !            60: 
        !            61: enum reload_when_needed
        !            62: {
        !            63:   RELOAD_FOR_INPUT_RELOAD_ADDRESS,
        !            64:   RELOAD_FOR_OUTPUT_RELOAD_ADDRESS,
        !            65:   RELOAD_FOR_OPERAND_ADDRESS,
        !            66:   /* The following two are not fully implemented.
        !            67:      They are used in emitting insns, but they aren't distinguished from
        !            68:      RELOAD_OTHER when computing the number of spills.  What they accomplish
        !            69:      is to avoid precluding inheritance of already loaded values
        !            70:      for input reloads when there are also output reloads.  */
        !            71:   RELOAD_FOR_INPUT,
        !            72:   RELOAD_FOR_OUTPUT,
        !            73:   RELOAD_OTHER
        !            74: };
        !            75: 
        !            76: extern enum reload_when_needed reload_when_needed[MAX_RELOADS];
        !            77: 
        !            78: extern rtx *reg_equiv_constant;
        !            79: extern rtx *reg_equiv_address;
        !            80: extern rtx *reg_equiv_mem;
        !            81: 
        !            82: /* All the "earlyclobber" operands of the current insn
        !            83:    are recorded here.  */
        !            84: extern int n_earlyclobbers;
        !            85: extern rtx reload_earlyclobbers[MAX_RECOG_OPERANDS];
        !            86: 
        !            87: /* First uid used by insns created by reload in this function.
        !            88:    Used in find_equiv_reg.  */
        !            89: extern int reload_first_uid;
        !            90: 
        !            91: /* Nonzero if indirect addressing is supported when the innermost MEM is
        !            92:    of the form (MEM (SYMBOL_REF sym)).  It is assumed that the level to
        !            93:    which these are valid is the same as spill_indirect_levels, above.   */
        !            94: 
        !            95: extern char indirect_symref_ok;
        !            96: 
        !            97: /* Nonzero if an address (plus (reg frame_pointer) (reg ...)) is valid.  */
        !            98: extern char double_reg_address_ok;
        !            99: 
        !           100: #ifdef MAX_INSN_CODE
        !           101: /* These arrays record the insn_code of insns that may be needed to
        !           102:    perform input and output reloads of special objects.  They provide a
        !           103:    place to pass a scratch register.  */
        !           104: extern enum insn_code reload_in_optab[];
        !           105: extern enum insn_code reload_out_optab[];
        !           106: #endif
        !           107: 
        !           108: extern void init_reload ();
        !           109: extern void find_reloads ();
        !           110: extern void subst_reloads ();
        !           111: extern rtx eliminate_regs ();
        !           112: extern rtx gen_input_reload ();

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