1/* A class for building vector rtx constants.
2 Copyright (C) 2017-2023 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_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. */
27class 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
33public:
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
43private:
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
70inline
71rtx_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
81inline void
82rtx_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
91inline bool
92rtx_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
101inline bool
102rtx_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
109inline bool
110rtx_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
118inline poly_wide_int
119rtx_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

source code of gcc/rtx-vector-builder.h