1 /* Communication between reload.c and reload1.c.
2 Copyright (C) 1987, 1991 Free Software Foundation, Inc.
4 This file is part of GNU CC.
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)
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.
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. */
21 /* See reload.c and reload1.c for comments on these variables. */
23 /* Maximum number of reloads we can need. */
24 #define MAX_RELOADS (2 * MAX_RECOG_OPERANDS * (MAX_REGS_PER_ADDRESS + 1))
26 extern rtx reload_in
[MAX_RELOADS
];
27 extern rtx reload_out
[MAX_RELOADS
];
28 extern rtx reload_in_reg
[MAX_RELOADS
];
29 extern enum reg_class reload_reg_class
[MAX_RELOADS
];
30 extern enum machine_mode reload_inmode
[MAX_RELOADS
];
31 extern enum machine_mode reload_outmode
[MAX_RELOADS
];
32 extern char reload_strict_low
[MAX_RELOADS
];
33 extern char reload_optional
[MAX_RELOADS
];
34 extern int reload_inc
[MAX_RELOADS
];
35 extern int reload_needed_for_multiple
[MAX_RELOADS
];
36 extern rtx reload_needed_for
[MAX_RELOADS
];
37 extern int reload_secondary_reload
[MAX_RELOADS
];
38 extern int reload_secondary_p
[MAX_RELOADS
];
41 extern rtx reload_reg_rtx
[MAX_RELOADS
];
43 enum reload_when_needed
45 RELOAD_FOR_INPUT_RELOAD_ADDRESS
,
46 RELOAD_FOR_OUTPUT_RELOAD_ADDRESS
,
47 RELOAD_FOR_OPERAND_ADDRESS
,
48 /* The following two are not fully implemented.
49 They are used in emitting insns, but they aren't distinguished from
50 RELOAD_OTHER when computing the number of spills. What they accomplish
51 is to avoid precluding inheritance of already loaded values
52 for input reloads when there are also output reloads. */
58 extern enum reload_when_needed reload_when_needed
[MAX_RELOADS
];
60 extern rtx
*reg_equiv_constant
;
61 extern rtx
*reg_equiv_address
;
62 extern rtx
*reg_equiv_mem
;
64 /* All the "earlyclobber" operands of the current insn
66 extern int n_earlyclobbers
;
67 extern rtx reload_earlyclobbers
[MAX_RECOG_OPERANDS
];
69 /* First uid used by insns created by reload in this function.
70 Used in find_equiv_reg. */
71 extern int reload_first_uid
;
73 /* Nonzero if indirect addressing is supported when the innermost MEM is
74 of the form (MEM (SYMBOL_REF sym)). It is assumed that the level to
75 which these are valid is the same as spill_indirect_levels, above. */
77 extern char indirect_symref_ok
;
79 /* Nonzero if an address (plus (reg frame_pointer) (reg ...)) is valid. */
80 extern char double_reg_address_ok
;
84 void subst_reloads ();
85 rtx
eliminate_regs ();