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b4e0cbb5 RK |
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 | ||
defc614f RK |
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 | ||
b4e0cbb5 RK |
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]; | |
defc614f RK |
54 | #ifdef MAX_INSN_CODE |
55 | extern enum insn_code reload_secondary_icode[MAX_RELOADS]; | |
56 | #endif | |
b4e0cbb5 RK |
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 | ||
defc614f RK |
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 | ||
b4e0cbb5 RK |
108 | void init_reload (); |
109 | void find_reloads (); | |
110 | void subst_reloads (); | |
111 | rtx eliminate_regs (); |