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1.1 root 1: /* Communication between reload.c and reload1.c. 1.1.1.5 ! root 2: Copyright (C) 1987, 1991, 1992, 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 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_optional[MAX_RELOADS]; 48: extern int reload_inc[MAX_RELOADS]; 1.1.1.4 root 49: extern int reload_opnum[MAX_RELOADS]; 1.1 root 50: extern int reload_secondary_p[MAX_RELOADS]; 1.1.1.5 ! root 51: extern int reload_secondary_in_reload[MAX_RELOADS]; ! 52: extern int reload_secondary_out_reload[MAX_RELOADS]; 1.1 root 53: #ifdef MAX_INSN_CODE 1.1.1.5 ! root 54: extern enum insn_code reload_secondary_in_icode[MAX_RELOADS]; ! 55: extern enum insn_code reload_secondary_out_icode[MAX_RELOADS]; 1.1 root 56: #endif 57: extern int n_reloads; 58: 59: extern rtx reload_reg_rtx[MAX_RELOADS]; 60: 1.1.1.4 root 61: /* Encode the usage of a reload. The following codes are supported: 62: 63: RELOAD_FOR_INPUT reload of an input operand 64: RELOAD_FOR_OUTPUT likewise, for output 65: RELOAD_FOR_INSN a reload that must not conflict with anything 66: used in the insn, but may conflict with 67: something used before or after the insn 68: RELOAD_FOR_INPUT_ADDRESS reload for parts of the address of an object 69: that is an input reload 70: RELOAD_FOR_OUTPUT_ADDRESS likewise, for output reload 71: RELOAD_FOR_OPERAND_ADDRESS reload for the address of a non-reloaded 72: operand; these don't conflict with 73: any other addresses. 1.1.1.5 ! root 74: RELOAD_FOR_OPADDR_ADDR reload needed for RELOAD_FOR_OPERAND_ADDRESS ! 75: reloads; usually secondary reloads 1.1.1.4 root 76: RELOAD_OTHER none of the above, usually multiple uses 77: RELOAD_FOR_OTHER_ADDRESS reload for part of the address of an input 78: that is marked RELOAD_OTHER. 79: 80: This used to be "enum reload_when_needed" but some debuggers have trouble 81: with an enum tag and variable of the same name. */ 82: 83: enum reload_type 1.1 root 84: { 1.1.1.4 root 85: RELOAD_FOR_INPUT, RELOAD_FOR_OUTPUT, RELOAD_FOR_INSN, 86: RELOAD_FOR_INPUT_ADDRESS, RELOAD_FOR_OUTPUT_ADDRESS, 1.1.1.5 ! root 87: RELOAD_FOR_OPERAND_ADDRESS, RELOAD_FOR_OPADDR_ADDR, ! 88: RELOAD_OTHER, RELOAD_FOR_OTHER_ADDRESS 1.1 root 89: }; 90: 1.1.1.4 root 91: extern enum reload_type reload_when_needed[MAX_RELOADS]; 1.1 root 92: 93: extern rtx *reg_equiv_constant; 1.1.1.2 root 94: extern rtx *reg_equiv_memory_loc; 1.1 root 95: extern rtx *reg_equiv_address; 96: extern rtx *reg_equiv_mem; 97: 98: /* All the "earlyclobber" operands of the current insn 99: are recorded here. */ 100: extern int n_earlyclobbers; 101: extern rtx reload_earlyclobbers[MAX_RECOG_OPERANDS]; 102: 1.1.1.4 root 103: /* Save the number of operands. */ 104: extern int reload_n_operands; 105: 1.1 root 106: /* First uid used by insns created by reload in this function. 107: Used in find_equiv_reg. */ 108: extern int reload_first_uid; 109: 110: /* Nonzero if indirect addressing is supported when the innermost MEM is 111: of the form (MEM (SYMBOL_REF sym)). It is assumed that the level to 112: which these are valid is the same as spill_indirect_levels, above. */ 113: 114: extern char indirect_symref_ok; 115: 116: /* Nonzero if an address (plus (reg frame_pointer) (reg ...)) is valid. */ 117: extern char double_reg_address_ok; 118: 119: #ifdef MAX_INSN_CODE 120: /* These arrays record the insn_code of insns that may be needed to 121: perform input and output reloads of special objects. They provide a 122: place to pass a scratch register. */ 123: extern enum insn_code reload_in_optab[]; 124: extern enum insn_code reload_out_optab[]; 125: #endif 126: 1.1.1.4 root 127: /* Functions from reload.c: */ 128: 129: /* Return a memory location that will be used to copy X in mode MODE. 130: If we haven't already made a location for this mode in this insn, 131: call find_reloads_address on the location being returned. */ 132: extern rtx get_secondary_mem PROTO((rtx, enum machine_mode, 133: int, enum reload_type)); 134: 135: /* Clear any secondary memory locations we've made. */ 136: extern void clear_secondary_mem PROTO((void)); 137: 138: /* Transfer all replacements that used to be in reload FROM to be in 139: reload TO. */ 140: extern void transfer_replacements PROTO((int, int)); 141: 142: /* Return 1 if ADDR is a valid memory address for mode MODE, 143: and check that each pseudo reg has the proper kind of 144: hard reg. */ 145: extern int strict_memory_address_p PROTO((enum machine_mode, rtx)); 146: 147: /* Like rtx_equal_p except that it allows a REG and a SUBREG to match 148: if they are the same hard reg, and has special hacks for 149: autoincrement and autodecrement. */ 150: extern int operands_match_p PROTO((rtx, rtx)); 151: 152: /* Return the number of times character C occurs in string S. */ 153: extern int n_occurrences PROTO((int, char *)); 154: 155: /* Return 1 if altering OP will not modify the value of CLOBBER. */ 156: extern int safe_from_earlyclobber PROTO((rtx, rtx)); 157: 158: /* Search the body of INSN for values that need reloading and record them 159: with push_reload. REPLACE nonzero means record also where the values occur 160: so that subst_reloads can be used. */ 161: extern void find_reloads PROTO((rtx, int, int, int, short *)); 162: 163: /* Compute the sum of X and Y, making canonicalizations assumed in an 164: address, namely: sum constant integers, surround the sum of two 165: constants with a CONST, put the constant as the second operand, and 166: group the constant on the outermost sum. */ 167: extern rtx form_sum PROTO((rtx, rtx)); 168: 169: /* Substitute into the current INSN the registers into which we have reloaded 170: the things that need reloading. */ 171: extern void subst_reloads PROTO((void)); 172: 173: /* Make a copy of any replacements being done into X and move those copies 174: to locations in Y, a copy of X. We only look at the highest level of 175: the RTL. */ 176: extern void copy_replacements PROTO((rtx, rtx)); 177: 178: /* If LOC was scheduled to be replaced by something, return the replacement. 179: Otherwise, return *LOC. */ 180: extern rtx find_replacement PROTO((rtx *)); 181: 182: /* Return nonzero if register in range [REGNO, ENDREGNO) 183: appears either explicitly or implicitly in X 184: other than being stored into. */ 185: extern int refers_to_regno_for_reload_p PROTO((int, int, rtx, rtx *)); 186: 187: /* Nonzero if modifying X will affect IN. */ 188: extern int reg_overlap_mentioned_for_reload_p PROTO((rtx, rtx)); 189: 190: /* Return nonzero if anything in X contains a MEM. Look also for pseudo 191: registers. */ 192: extern int refers_to_mem_for_reload_p PROTO((rtx)); 193: 194: /* Check the insns before INSN to see if there is a suitable register 195: containing the same value as GOAL. */ 196: extern rtx find_equiv_reg PROTO((rtx, rtx, enum reg_class, int, short *, 197: int, enum machine_mode)); 198: 199: /* Return 1 if register REGNO is the subject of a clobber in insn INSN. */ 200: extern int regno_clobbered_p PROTO((int, rtx)); 201: 202: 203: /* Functions in reload1.c: */ 204: 205: /* Initialize the reload pass once per compilation. */ 206: extern void init_reload PROTO((void)); 207: 208: /* The reload pass itself. */ 209: extern int reload STDIO_PROTO((rtx, int, FILE *)); 210: 211: /* Mark the slots in regs_ever_live for the hard regs 212: used by pseudo-reg number REGNO. */ 213: extern void mark_home_live PROTO((int)); 214: 215: /* Scan X and replace any eliminable registers (such as fp) with a 216: replacement (such as sp), plus an offset. */ 217: extern rtx eliminate_regs PROTO((rtx, enum machine_mode, rtx)); 218: 1.1.1.5 ! root 219: /* Emit code to perform a reload from IN (which may be a reload register) to ! 220: OUT (which may also be a reload register). IN or OUT is from operand ! 221: OPNUM with reload type TYPE. */ ! 222: extern rtx gen_reload PROTO((rtx, rtx, int, enum reload_type)); 1.1.1.4 root 223: 224: /* Functions in caller-save.c: */ 225: 226: /* Initialize for caller-save. */ 227: extern void init_caller_save PROTO((void)); 228: 229: /* Initialize save areas by showing that we haven't allocated any yet. */ 230: extern void init_save_areas PROTO((void)); 231: 232: /* Allocate save areas for any hard registers that might need saving. */ 233: extern int setup_save_areas PROTO((int *)); 234: 235: /* Find the places where hard regs are live across calls and save them. */ 236: extern void save_call_clobbered_regs PROTO((enum machine_mode));
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