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a80726d1 | 1 | /* A class for building vector rtx constants. |
8e8f6434 | 2 | Copyright (C) 2017-2018 Free Software Foundation, Inc. |
a80726d1 | 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 | #ifndef GCC_RTX_VECTOR_BUILDER_H | |
21 | #define GCC_RTX_VECTOR_BUILDER_H | |
22 | ||
23 | #include "vector-builder.h" | |
24 | ||
25 | /* This class is used to build VECTOR_CSTs from a sequence of elements. | |
26 | See vector_builder for more details. */ | |
27 | class rtx_vector_builder : public vector_builder<rtx, rtx_vector_builder> | |
28 | { | |
29 | typedef vector_builder<rtx, rtx_vector_builder> parent; | |
30 | friend class vector_builder<rtx, rtx_vector_builder>; | |
31 | ||
32 | public: | |
33 | rtx_vector_builder () : m_mode (VOIDmode) {} | |
34 | rtx_vector_builder (machine_mode, unsigned int, unsigned int); | |
35 | rtx build (rtvec); | |
36 | rtx build (); | |
37 | ||
38 | machine_mode mode () const { return m_mode; } | |
39 | ||
40 | void new_vector (machine_mode, unsigned int, unsigned int); | |
41 | ||
42 | private: | |
43 | bool equal_p (rtx, rtx) const; | |
44 | bool allow_steps_p () const; | |
45 | bool integral_p (rtx) const; | |
46 | wide_int step (rtx, rtx) const; | |
47 | rtx apply_step (rtx, unsigned int, const wide_int &) const; | |
48 | bool can_elide_p (rtx) const { return true; } | |
49 | void note_representative (rtx *, rtx) {} | |
50 | ||
51 | rtx find_cached_value (); | |
52 | ||
53 | machine_mode m_mode; | |
54 | }; | |
55 | ||
56 | /* Create a new builder for a vector of mode MODE. Initially encode the | |
57 | value as NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements | |
58 | each. */ | |
59 | ||
60 | inline | |
61 | rtx_vector_builder::rtx_vector_builder (machine_mode mode, | |
62 | unsigned int npatterns, | |
63 | unsigned int nelts_per_pattern) | |
64 | { | |
65 | new_vector (mode, npatterns, nelts_per_pattern); | |
66 | } | |
67 | ||
68 | /* Start building a new vector of mode MODE. Initially encode the value | |
69 | as NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements each. */ | |
70 | ||
71 | inline void | |
72 | rtx_vector_builder::new_vector (machine_mode mode, unsigned int npatterns, | |
73 | unsigned int nelts_per_pattern) | |
74 | { | |
75 | m_mode = mode; | |
76 | parent::new_vector (GET_MODE_NUNITS (mode), npatterns, nelts_per_pattern); | |
77 | } | |
78 | ||
79 | /* Return true if elements ELT1 and ELT2 are equal. */ | |
80 | ||
81 | inline bool | |
82 | rtx_vector_builder::equal_p (rtx elt1, rtx elt2) const | |
83 | { | |
84 | return rtx_equal_p (elt1, elt2); | |
85 | } | |
86 | ||
87 | /* Return true if a stepped representation is OK. We don't allow | |
88 | linear series for anything other than integers, to avoid problems | |
89 | with rounding. */ | |
90 | ||
91 | inline bool | |
92 | rtx_vector_builder::allow_steps_p () const | |
93 | { | |
94 | return is_a <scalar_int_mode> (GET_MODE_INNER (m_mode)); | |
95 | } | |
96 | ||
97 | /* Return true if element ELT can be interpreted as an integer. */ | |
98 | ||
99 | inline bool | |
100 | rtx_vector_builder::integral_p (rtx elt) const | |
101 | { | |
102 | return CONST_SCALAR_INT_P (elt); | |
103 | } | |
104 | ||
105 | /* Return the value of element ELT2 minus the value of element ELT1. | |
106 | Both elements are known to be CONST_SCALAR_INT_Ps. */ | |
107 | ||
108 | inline wide_int | |
109 | rtx_vector_builder::step (rtx elt1, rtx elt2) const | |
110 | { | |
111 | return wi::sub (rtx_mode_t (elt2, GET_MODE_INNER (m_mode)), | |
112 | rtx_mode_t (elt1, GET_MODE_INNER (m_mode))); | |
113 | } | |
114 | ||
115 | #endif |