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3245eea0 CH |
1 | /* Define control and data flow tables, and regsets. |
2 | Copyright (C) 1987 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 | /* Number of bits in each actual element of a regset. */ | |
22 | ||
23 | #define REGSET_ELT_BITS HOST_BITS_PER_WIDE_INT | |
24 | ||
25 | /* Type to use for a regset element. Note that lots of code assumes | |
26 | that the initial part of a regset that contains information on the | |
27 | hard registers is the same format as a HARD_REG_SET. */ | |
28 | ||
344080e6 | 29 | #define REGSET_ELT_TYPE unsigned HOST_WIDE_INT |
3245eea0 CH |
30 | |
31 | /* Define the type for a pointer to a set with a bit for each | |
32 | (hard or pseudo) register. */ | |
33 | ||
34 | typedef REGSET_ELT_TYPE *regset; | |
35 | ||
36 | /* Size of a regset for the current function, | |
37 | in (1) bytes and (2) elements. */ | |
38 | ||
39 | extern int regset_bytes; | |
40 | extern int regset_size; | |
41 | ||
42 | /* Number of basic blocks in the current function. */ | |
43 | ||
44 | extern int n_basic_blocks; | |
45 | ||
46 | /* Index by basic block number, get first insn in the block. */ | |
47 | ||
48 | extern rtx *basic_block_head; | |
49 | ||
50 | /* Index by basic block number, get last insn in the block. */ | |
51 | ||
52 | extern rtx *basic_block_end; | |
53 | ||
54 | /* Index by basic block number, get address of regset | |
55 | describing the registers live at the start of that block. */ | |
56 | ||
57 | extern regset *basic_block_live_at_start; | |
58 | ||
59 | /* Indexed by n, gives number of basic block that (REG n) is used in. | |
60 | If the value is REG_BLOCK_GLOBAL (-2), | |
61 | it means (REG n) is used in more than one basic block. | |
62 | REG_BLOCK_UNKNOWN (-1) means it hasn't been seen yet so we don't know. | |
63 | This information remains valid for the rest of the compilation | |
64 | of the current function; it is used to control register allocation. */ | |
65 | ||
66 | #define REG_BLOCK_UNKNOWN -1 | |
67 | #define REG_BLOCK_GLOBAL -2 | |
09d2cd9b | 68 | extern int *reg_basic_block; |