]>
Commit | Line | Data |
---|---|---|
1 | /* A class for building vector rtx constants. | |
2 | Copyright (C) 2017-2020 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 3, 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 COPYING3. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "config.h" | |
21 | #include "system.h" | |
22 | #include "coretypes.h" | |
23 | #include "tm.h" | |
24 | #include "rtl.h" | |
25 | #include "rtx-vector-builder.h" | |
26 | ||
27 | /* Return a CONST_VECTOR for the current constant. V is an existing | |
28 | rtvec that contains all the elements. */ | |
29 | ||
30 | rtx | |
31 | rtx_vector_builder::build (rtvec v) | |
32 | { | |
33 | finalize (); | |
34 | ||
35 | rtx x = find_cached_value (); | |
36 | if (x) | |
37 | return x; | |
38 | ||
39 | x = gen_rtx_raw_CONST_VECTOR (m_mode, v); | |
40 | CONST_VECTOR_NPATTERNS (x) = npatterns (); | |
41 | CONST_VECTOR_NELTS_PER_PATTERN (x) = nelts_per_pattern (); | |
42 | return x; | |
43 | } | |
44 | ||
45 | /* Return a vector element with the value BASE + FACTOR * STEP. */ | |
46 | ||
47 | rtx | |
48 | rtx_vector_builder::apply_step (rtx base, unsigned int factor, | |
49 | const wide_int &step) const | |
50 | { | |
51 | scalar_int_mode int_mode = as_a <scalar_int_mode> (GET_MODE_INNER (m_mode)); | |
52 | return immed_wide_int_const (wi::add (rtx_mode_t (base, int_mode), | |
53 | factor * step), | |
54 | int_mode); | |
55 | } | |
56 | ||
57 | /* Return a CONST_VECTOR for the current constant. */ | |
58 | ||
59 | rtx | |
60 | rtx_vector_builder::build () | |
61 | { | |
62 | finalize (); | |
63 | ||
64 | rtx x = find_cached_value (); | |
65 | if (x) | |
66 | return x; | |
67 | ||
68 | unsigned int nelts; | |
69 | if (!GET_MODE_NUNITS (m_mode).is_constant (&nelts)) | |
70 | nelts = encoded_nelts (); | |
71 | rtvec v = rtvec_alloc (nelts); | |
72 | for (unsigned int i = 0; i < nelts; ++i) | |
73 | RTVEC_ELT (v, i) = elt (i); | |
74 | x = gen_rtx_raw_CONST_VECTOR (m_mode, v); | |
75 | CONST_VECTOR_NPATTERNS (x) = npatterns (); | |
76 | CONST_VECTOR_NELTS_PER_PATTERN (x) = nelts_per_pattern (); | |
77 | return x; | |
78 | } | |
79 | ||
80 | /* Check whether there is a global cached value for the vector. | |
81 | Return it if so, otherwise return null. */ | |
82 | ||
83 | rtx | |
84 | rtx_vector_builder::find_cached_value () | |
85 | { | |
86 | if (encoded_nelts () != 1) | |
87 | return NULL_RTX; | |
88 | ||
89 | rtx elt = (*this)[0]; | |
90 | ||
91 | if (GET_MODE_CLASS (m_mode) == MODE_VECTOR_BOOL) | |
92 | { | |
93 | if (elt == const1_rtx || elt == constm1_rtx) | |
94 | return CONST1_RTX (m_mode); | |
95 | else if (elt == const0_rtx) | |
96 | return CONST0_RTX (m_mode); | |
97 | else | |
98 | gcc_unreachable (); | |
99 | } | |
100 | ||
101 | /* We can be called before the global vector constants are set up, | |
102 | but in that case we'll just return null. */ | |
103 | scalar_mode inner_mode = GET_MODE_INNER (m_mode); | |
104 | if (elt == CONST0_RTX (inner_mode)) | |
105 | return CONST0_RTX (m_mode); | |
106 | else if (elt == CONST1_RTX (inner_mode)) | |
107 | return CONST1_RTX (m_mode); | |
108 | else if (elt == CONSTM1_RTX (inner_mode)) | |
109 | return CONSTM1_RTX (m_mode); | |
110 | ||
111 | return NULL_RTX; | |
112 | } |