1 /* A class for building vector rtx constants.
2 Copyright (C) 2017-2018 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, 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:
rtx_vector_builder()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
mode()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;
can_elide_p(rtx)48 bool can_elide_p (rtx) const { return true; }
note_representative(rtx *,rtx)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
rtx_vector_builder(machine_mode mode,unsigned int npatterns,unsigned int nelts_per_pattern)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
new_vector(machine_mode mode,unsigned int npatterns,unsigned int nelts_per_pattern)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
equal_p(rtx elt1,rtx elt2)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
allow_steps_p()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
integral_p(rtx elt)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
step(rtx elt1,rtx elt2)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
116