1 | /* A class for building vector rtx constants. |
2 | Copyright (C) 2017-2023 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 | #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, machine_mode, |
28 | rtx_vector_builder> |
29 | { |
30 | typedef vector_builder<rtx, machine_mode, rtx_vector_builder> parent; |
31 | friend class vector_builder<rtx, machine_mode, rtx_vector_builder>; |
32 | |
33 | public: |
34 | rtx_vector_builder () : m_mode (VOIDmode) {} |
35 | rtx_vector_builder (machine_mode, unsigned int, unsigned int); |
36 | rtx build (rtvec); |
37 | rtx build (); |
38 | |
39 | machine_mode mode () const { return m_mode; } |
40 | |
41 | void new_vector (machine_mode, unsigned int, unsigned int); |
42 | |
43 | private: |
44 | bool equal_p (rtx, rtx) const; |
45 | bool allow_steps_p () const; |
46 | bool integral_p (rtx) const; |
47 | poly_wide_int step (rtx, rtx) const; |
48 | rtx apply_step (rtx, unsigned int, const poly_wide_int &) const; |
49 | bool can_elide_p (rtx) const { return true; } |
50 | void note_representative (rtx *, rtx) {} |
51 | |
52 | static poly_uint64 shape_nelts (machine_mode mode) |
53 | { return GET_MODE_NUNITS (mode); } |
54 | static poly_uint64 nelts_of (const_rtx x) |
55 | { return CONST_VECTOR_NUNITS (x); } |
56 | static unsigned int npatterns_of (const_rtx x) |
57 | { return CONST_VECTOR_NPATTERNS (x); } |
58 | static unsigned int nelts_per_pattern_of (const_rtx x) |
59 | { return CONST_VECTOR_NELTS_PER_PATTERN (x); } |
60 | |
61 | rtx find_cached_value (); |
62 | |
63 | machine_mode m_mode; |
64 | }; |
65 | |
66 | /* Create a new builder for a vector of mode MODE. Initially encode the |
67 | value as NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements |
68 | each. */ |
69 | |
70 | inline |
71 | rtx_vector_builder::rtx_vector_builder (machine_mode mode, |
72 | unsigned int npatterns, |
73 | unsigned int nelts_per_pattern) |
74 | { |
75 | new_vector (mode, npatterns, nelts_per_pattern); |
76 | } |
77 | |
78 | /* Start building a new vector of mode MODE. Initially encode the value |
79 | as NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements each. */ |
80 | |
81 | inline void |
82 | rtx_vector_builder::new_vector (machine_mode mode, unsigned int npatterns, |
83 | unsigned int nelts_per_pattern) |
84 | { |
85 | m_mode = mode; |
86 | parent::new_vector (full_nelts: GET_MODE_NUNITS (mode), npatterns, nelts_per_pattern); |
87 | } |
88 | |
89 | /* Return true if elements ELT1 and ELT2 are equal. */ |
90 | |
91 | inline bool |
92 | rtx_vector_builder::equal_p (rtx elt1, rtx elt2) const |
93 | { |
94 | return rtx_equal_p (elt1, elt2); |
95 | } |
96 | |
97 | /* Return true if a stepped representation is OK. We don't allow |
98 | linear series for anything other than integers, to avoid problems |
99 | with rounding. */ |
100 | |
101 | inline bool |
102 | rtx_vector_builder::allow_steps_p () const |
103 | { |
104 | return is_a <scalar_int_mode> (GET_MODE_INNER (m_mode)); |
105 | } |
106 | |
107 | /* Return true if element ELT can be interpreted as an integer. */ |
108 | |
109 | inline bool |
110 | rtx_vector_builder::integral_p (rtx elt) const |
111 | { |
112 | return CONST_SCALAR_INT_P (elt); |
113 | } |
114 | |
115 | /* Return the value of element ELT2 minus the value of element ELT1. |
116 | Both elements are known to be CONST_SCALAR_INT_Ps. */ |
117 | |
118 | inline poly_wide_int |
119 | rtx_vector_builder::step (rtx elt1, rtx elt2) const |
120 | { |
121 | return (wi::to_poly_wide (x: elt2, GET_MODE_INNER (m_mode)) |
122 | - wi::to_poly_wide (x: elt1, GET_MODE_INNER (m_mode))); |
123 | } |
124 | |
125 | #endif |
126 | |