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2f93eea8 PB |
1 | /* Generic hooks for the RTL middle-end. |
2 | Copyright (C) 2004 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 2, or (at your option) any later | |
9 | version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GCC; see the file COPYING. If not, write to the Free | |
18 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
19 | 02111-1307, USA. */ | |
20 | ||
21 | #include "config.h" | |
22 | #include "system.h" | |
23 | #include "coretypes.h" | |
24 | #include "tm.h" | |
25 | #include "rtl.h" | |
26 | #include "rtlhooks-def.h" | |
27 | #include "expr.h" | |
28 | \f | |
29 | ||
30 | /* For speed, we will copy the RTX hooks struct member-by-member | |
31 | instead of doing indirect calls. For these reason, we initialize | |
32 | *two* struct rtl_hooks globals: rtl_hooks is the one that is used | |
33 | to actually call the hooks, while general_rtl_hooks is used | |
34 | to restore the hooks by passes that modify them. */ | |
35 | ||
36 | const struct rtl_hooks general_rtl_hooks = RTL_HOOKS_INITIALIZER; | |
37 | struct rtl_hooks rtl_hooks = RTL_HOOKS_INITIALIZER; | |
38 | ||
39 | rtx | |
40 | gen_lowpart_general (enum machine_mode mode, rtx x) | |
41 | { | |
42 | rtx result = gen_lowpart_common (mode, x); | |
43 | ||
44 | if (result) | |
45 | return result; | |
f8cfc6aa | 46 | else if (REG_P (x)) |
2f93eea8 PB |
47 | { |
48 | /* Must be a hard reg that's not valid in MODE. */ | |
49 | result = gen_lowpart_common (mode, copy_to_reg (x)); | |
50 | if (result == 0) | |
51 | abort (); | |
52 | return result; | |
53 | } | |
3c0cb5de | 54 | else if (MEM_P (x)) |
2f93eea8 PB |
55 | { |
56 | /* The only additional case we can do is MEM. */ | |
57 | int offset = 0; | |
58 | ||
59 | /* The following exposes the use of "x" to CSE. */ | |
60 | if (GET_MODE_SIZE (GET_MODE (x)) <= UNITS_PER_WORD | |
61 | && SCALAR_INT_MODE_P (GET_MODE (x)) | |
62 | && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode), | |
63 | GET_MODE_BITSIZE (GET_MODE (x))) | |
64 | && ! no_new_pseudos) | |
65 | return gen_lowpart_general (mode, force_reg (GET_MODE (x), x)); | |
66 | ||
67 | if (WORDS_BIG_ENDIAN) | |
68 | offset = (MAX (GET_MODE_SIZE (GET_MODE (x)), UNITS_PER_WORD) | |
69 | - MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD)); | |
70 | ||
71 | if (BYTES_BIG_ENDIAN) | |
72 | /* Adjust the address so that the address-after-the-data | |
73 | is unchanged. */ | |
74 | offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode)) | |
75 | - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (x)))); | |
76 | ||
77 | return adjust_address (x, mode, offset); | |
78 | } | |
2f93eea8 PB |
79 | else |
80 | abort (); | |
81 | } | |
82 | ||
83 | rtx | |
84 | reg_num_sign_bit_copies_general (rtx x ATTRIBUTE_UNUSED, | |
85 | enum machine_mode mode ATTRIBUTE_UNUSED, | |
86 | rtx known_x ATTRIBUTE_UNUSED, | |
87 | enum machine_mode known_mode ATTRIBUTE_UNUSED, | |
88 | unsigned int known_ret ATTRIBUTE_UNUSED, | |
89 | unsigned int *result ATTRIBUTE_UNUSED) | |
90 | { | |
91 | return NULL; | |
92 | } | |
93 | ||
94 | rtx | |
95 | reg_nonzero_bits_general (rtx x ATTRIBUTE_UNUSED, | |
96 | enum machine_mode mode ATTRIBUTE_UNUSED, | |
97 | rtx known_x ATTRIBUTE_UNUSED, | |
98 | enum machine_mode known_mode ATTRIBUTE_UNUSED, | |
99 | unsigned HOST_WIDE_INT known_ret ATTRIBUTE_UNUSED, | |
100 | unsigned HOST_WIDE_INT *nonzero ATTRIBUTE_UNUSED) | |
101 | { | |
102 | return NULL; | |
103 | } |