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1/* A class for building vector tree constants.
2 Copyright (C) 2017 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 3, or (at your option) any later
9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License
17along with GCC; see the file COPYING3. If not see
18<http://www.gnu.org/licenses/>. */
19
20#ifndef GCC_TREE_VECTOR_BUILDER_H
21#define GCC_TREE_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. */
27class tree_vector_builder : public vector_builder<tree, tree_vector_builder>
28{
29 typedef vector_builder<tree, tree_vector_builder> parent;
30 friend class vector_builder<tree, tree_vector_builder>;
31
32public:
33 tree_vector_builder () : m_type (0) {}
34 tree_vector_builder (tree, unsigned int, unsigned int);
35 tree build ();
36
37 tree type () const { return m_type; }
38
39 void new_vector (tree, unsigned int, unsigned int);
40 bool new_unary_operation (tree, tree, bool);
41 bool new_binary_operation (tree, tree, tree, bool);
42
43 static unsigned int binary_encoded_nelts (tree, tree);
44
45private:
46 bool equal_p (const_tree, const_tree) const;
47 bool allow_steps_p () const;
48 bool integral_p (const_tree) const;
49 wide_int step (const_tree, const_tree) const;
50 tree apply_step (tree, unsigned int, const wide_int &) const;
51 bool can_elide_p (const_tree) const;
52 void note_representative (tree *, tree);
53
54 tree m_type;
55};
56
57/* Create a new builder for a vector of type TYPE. Initially encode the
58 value as NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements
59 each. */
60
61inline
62tree_vector_builder::tree_vector_builder (tree type, unsigned int npatterns,
63 unsigned int nelts_per_pattern)
64{
65 new_vector (type, npatterns, nelts_per_pattern);
66}
67
68/* Start building a new vector of type TYPE. Initially encode the value
69 as NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements each. */
70
71inline void
72tree_vector_builder::new_vector (tree type, unsigned int npatterns,
73 unsigned int nelts_per_pattern)
74{
75 m_type = type;
76 parent::new_vector (TYPE_VECTOR_SUBPARTS (type), npatterns,
77 nelts_per_pattern);
78}
79
80/* Return true if elements I1 and I2 are equal. */
81
82inline bool
83tree_vector_builder::equal_p (const_tree elt1, const_tree elt2) const
84{
85 return operand_equal_p (elt1, elt2, 0);
86}
87
88/* Return true if a stepped representation is OK. We don't allow
89 linear series for anything other than integers, to avoid problems
90 with rounding. */
91
92inline bool
93tree_vector_builder::allow_steps_p () const
94{
95 return INTEGRAL_TYPE_P (TREE_TYPE (m_type));
96}
97
98/* Return true if ELT can be interpreted as an integer. */
99
100inline bool
101tree_vector_builder::integral_p (const_tree elt) const
102{
103 return TREE_CODE (elt) == INTEGER_CST;
104}
105
106/* Return the value of element ELT2 minus the value of element ELT1.
107 Both elements are known to be INTEGER_CSTs. */
108
109inline wide_int
110tree_vector_builder::step (const_tree elt1, const_tree elt2) const
111{
112 return wi::to_wide (elt2) - wi::to_wide (elt1);
113}
114
115/* Return true if we can drop element ELT, even if the retained elements
116 are different. Return false if this would mean losing overflow
117 information. */
118
119inline bool
120tree_vector_builder::can_elide_p (const_tree elt) const
121{
122 return !CONSTANT_CLASS_P (elt) || !TREE_OVERFLOW (elt);
123}
124
125/* Record that ELT2 is being elided, given that ELT1_PTR points to the last
126 encoded element for the containing pattern. */
127
128inline void
129tree_vector_builder::note_representative (tree *elt1_ptr, tree elt2)
130{
131 if (CONSTANT_CLASS_P (elt2) && TREE_OVERFLOW (elt2))
132 {
133 gcc_assert (operand_equal_p (*elt1_ptr, elt2, 0));
134 if (!TREE_OVERFLOW (elt2))
135 *elt1_ptr = elt2;
136 }
137}
138
139#endif
140

Warning: That file was not part of the compilation database. It may have many parsing errors.