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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
1.1.1.6 ! root 18: the Free Software Foundation, 59 Temple Place - Suite 330,
! 19: Boston, MA 02111-1307, USA. */
1.1 root 20:
21:
22: /* If secondary reloads are the same for inputs and outputs, define those
23: macros here. */
24:
25: #ifdef SECONDARY_RELOAD_CLASS
26: #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
27: SECONDARY_RELOAD_CLASS (CLASS, MODE, X)
28: #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
29: SECONDARY_RELOAD_CLASS (CLASS, MODE, X)
30: #endif
31:
32: /* If either macro is defined, show that we need secondary reloads. */
33: #if defined(SECONDARY_INPUT_RELOAD_CLASS) || defined(SECONDARY_OUTPUT_RELOAD_CLASS)
34: #define HAVE_SECONDARY_RELOADS
35: #endif
36:
37: /* See reload.c and reload1.c for comments on these variables. */
38:
39: /* Maximum number of reloads we can need. */
40: #define MAX_RELOADS (2 * MAX_RECOG_OPERANDS * (MAX_REGS_PER_ADDRESS + 1))
41:
42: extern rtx reload_in[MAX_RELOADS];
43: extern rtx reload_out[MAX_RELOADS];
44: extern rtx reload_in_reg[MAX_RELOADS];
45: extern enum reg_class reload_reg_class[MAX_RELOADS];
46: extern enum machine_mode reload_inmode[MAX_RELOADS];
47: extern enum machine_mode reload_outmode[MAX_RELOADS];
48: extern char reload_optional[MAX_RELOADS];
49: extern int reload_inc[MAX_RELOADS];
1.1.1.4 root 50: extern int reload_opnum[MAX_RELOADS];
1.1 root 51: extern int reload_secondary_p[MAX_RELOADS];
1.1.1.5 root 52: extern int reload_secondary_in_reload[MAX_RELOADS];
53: extern int reload_secondary_out_reload[MAX_RELOADS];
1.1 root 54: #ifdef MAX_INSN_CODE
1.1.1.5 root 55: extern enum insn_code reload_secondary_in_icode[MAX_RELOADS];
56: extern enum insn_code reload_secondary_out_icode[MAX_RELOADS];
1.1 root 57: #endif
58: extern int n_reloads;
59:
60: extern rtx reload_reg_rtx[MAX_RELOADS];
61:
1.1.1.4 root 62: /* Encode the usage of a reload. The following codes are supported:
63:
64: RELOAD_FOR_INPUT reload of an input operand
65: RELOAD_FOR_OUTPUT likewise, for output
66: RELOAD_FOR_INSN a reload that must not conflict with anything
67: used in the insn, but may conflict with
68: something used before or after the insn
69: RELOAD_FOR_INPUT_ADDRESS reload for parts of the address of an object
70: that is an input reload
71: RELOAD_FOR_OUTPUT_ADDRESS likewise, for output reload
72: RELOAD_FOR_OPERAND_ADDRESS reload for the address of a non-reloaded
73: operand; these don't conflict with
74: any other addresses.
1.1.1.5 root 75: RELOAD_FOR_OPADDR_ADDR reload needed for RELOAD_FOR_OPERAND_ADDRESS
76: reloads; usually secondary reloads
1.1.1.4 root 77: RELOAD_OTHER none of the above, usually multiple uses
78: RELOAD_FOR_OTHER_ADDRESS reload for part of the address of an input
79: that is marked RELOAD_OTHER.
80:
81: This used to be "enum reload_when_needed" but some debuggers have trouble
82: with an enum tag and variable of the same name. */
83:
84: enum reload_type
1.1 root 85: {
1.1.1.4 root 86: RELOAD_FOR_INPUT, RELOAD_FOR_OUTPUT, RELOAD_FOR_INSN,
87: RELOAD_FOR_INPUT_ADDRESS, RELOAD_FOR_OUTPUT_ADDRESS,
1.1.1.5 root 88: RELOAD_FOR_OPERAND_ADDRESS, RELOAD_FOR_OPADDR_ADDR,
89: RELOAD_OTHER, RELOAD_FOR_OTHER_ADDRESS
1.1 root 90: };
91:
1.1.1.4 root 92: extern enum reload_type reload_when_needed[MAX_RELOADS];
1.1 root 93:
94: extern rtx *reg_equiv_constant;
1.1.1.2 root 95: extern rtx *reg_equiv_memory_loc;
1.1 root 96: extern rtx *reg_equiv_address;
97: extern rtx *reg_equiv_mem;
98:
99: /* All the "earlyclobber" operands of the current insn
100: are recorded here. */
101: extern int n_earlyclobbers;
102: extern rtx reload_earlyclobbers[MAX_RECOG_OPERANDS];
103:
1.1.1.4 root 104: /* Save the number of operands. */
105: extern int reload_n_operands;
106:
1.1 root 107: /* First uid used by insns created by reload in this function.
108: Used in find_equiv_reg. */
109: extern int reload_first_uid;
110:
111: /* Nonzero if indirect addressing is supported when the innermost MEM is
112: of the form (MEM (SYMBOL_REF sym)). It is assumed that the level to
113: which these are valid is the same as spill_indirect_levels, above. */
114:
115: extern char indirect_symref_ok;
116:
117: /* Nonzero if an address (plus (reg frame_pointer) (reg ...)) is valid. */
118: extern char double_reg_address_ok;
119:
120: #ifdef MAX_INSN_CODE
121: /* These arrays record the insn_code of insns that may be needed to
122: perform input and output reloads of special objects. They provide a
123: place to pass a scratch register. */
124: extern enum insn_code reload_in_optab[];
125: extern enum insn_code reload_out_optab[];
126: #endif
127:
1.1.1.4 root 128: /* Functions from reload.c: */
129:
130: /* Return a memory location that will be used to copy X in mode MODE.
131: If we haven't already made a location for this mode in this insn,
132: call find_reloads_address on the location being returned. */
133: extern rtx get_secondary_mem PROTO((rtx, enum machine_mode,
134: int, enum reload_type));
135:
136: /* Clear any secondary memory locations we've made. */
137: extern void clear_secondary_mem PROTO((void));
138:
139: /* Transfer all replacements that used to be in reload FROM to be in
140: reload TO. */
141: extern void transfer_replacements PROTO((int, int));
142:
143: /* Return 1 if ADDR is a valid memory address for mode MODE,
144: and check that each pseudo reg has the proper kind of
145: hard reg. */
146: extern int strict_memory_address_p PROTO((enum machine_mode, rtx));
147:
148: /* Like rtx_equal_p except that it allows a REG and a SUBREG to match
149: if they are the same hard reg, and has special hacks for
150: autoincrement and autodecrement. */
151: extern int operands_match_p PROTO((rtx, rtx));
152:
153: /* Return the number of times character C occurs in string S. */
154: extern int n_occurrences PROTO((int, char *));
155:
156: /* Return 1 if altering OP will not modify the value of CLOBBER. */
157: extern int safe_from_earlyclobber PROTO((rtx, rtx));
158:
159: /* Search the body of INSN for values that need reloading and record them
160: with push_reload. REPLACE nonzero means record also where the values occur
161: so that subst_reloads can be used. */
162: extern void find_reloads PROTO((rtx, int, int, int, short *));
163:
164: /* Compute the sum of X and Y, making canonicalizations assumed in an
165: address, namely: sum constant integers, surround the sum of two
166: constants with a CONST, put the constant as the second operand, and
167: group the constant on the outermost sum. */
168: extern rtx form_sum PROTO((rtx, rtx));
169:
170: /* Substitute into the current INSN the registers into which we have reloaded
171: the things that need reloading. */
172: extern void subst_reloads PROTO((void));
173:
174: /* Make a copy of any replacements being done into X and move those copies
175: to locations in Y, a copy of X. We only look at the highest level of
176: the RTL. */
177: extern void copy_replacements PROTO((rtx, rtx));
178:
179: /* If LOC was scheduled to be replaced by something, return the replacement.
180: Otherwise, return *LOC. */
181: extern rtx find_replacement PROTO((rtx *));
182:
183: /* Return nonzero if register in range [REGNO, ENDREGNO)
184: appears either explicitly or implicitly in X
185: other than being stored into. */
186: extern int refers_to_regno_for_reload_p PROTO((int, int, rtx, rtx *));
187:
188: /* Nonzero if modifying X will affect IN. */
189: extern int reg_overlap_mentioned_for_reload_p PROTO((rtx, rtx));
190:
191: /* Return nonzero if anything in X contains a MEM. Look also for pseudo
192: registers. */
193: extern int refers_to_mem_for_reload_p PROTO((rtx));
194:
195: /* Check the insns before INSN to see if there is a suitable register
196: containing the same value as GOAL. */
197: extern rtx find_equiv_reg PROTO((rtx, rtx, enum reg_class, int, short *,
198: int, enum machine_mode));
199:
200: /* Return 1 if register REGNO is the subject of a clobber in insn INSN. */
201: extern int regno_clobbered_p PROTO((int, rtx));
202:
203:
204: /* Functions in reload1.c: */
205:
206: /* Initialize the reload pass once per compilation. */
207: extern void init_reload PROTO((void));
208:
209: /* The reload pass itself. */
210: extern int reload STDIO_PROTO((rtx, int, FILE *));
211:
212: /* Mark the slots in regs_ever_live for the hard regs
213: used by pseudo-reg number REGNO. */
214: extern void mark_home_live PROTO((int));
215:
216: /* Scan X and replace any eliminable registers (such as fp) with a
217: replacement (such as sp), plus an offset. */
218: extern rtx eliminate_regs PROTO((rtx, enum machine_mode, rtx));
219:
1.1.1.5 root 220: /* Emit code to perform a reload from IN (which may be a reload register) to
221: OUT (which may also be a reload register). IN or OUT is from operand
222: OPNUM with reload type TYPE. */
223: extern rtx gen_reload PROTO((rtx, rtx, int, enum reload_type));
1.1.1.4 root 224:
225: /* Functions in caller-save.c: */
226:
227: /* Initialize for caller-save. */
228: extern void init_caller_save PROTO((void));
229:
230: /* Initialize save areas by showing that we haven't allocated any yet. */
231: extern void init_save_areas PROTO((void));
232:
233: /* Allocate save areas for any hard registers that might need saving. */
234: extern int setup_save_areas PROTO((int *));
235:
236: /* Find the places where hard regs are live across calls and save them. */
237: extern void save_call_clobbered_regs PROTO((enum machine_mode));
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