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131
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1 /* A class for building vector rtx constants.
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2 Copyright (C) 2017-2018 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #ifndef GCC_RTX_VECTOR_BUILDER_H
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21 #define GCC_RTX_VECTOR_BUILDER_H
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22
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23 #include "vector-builder.h"
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24
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25 /* This class is used to build VECTOR_CSTs from a sequence of elements.
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26 See vector_builder for more details. */
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27 class rtx_vector_builder : public vector_builder<rtx, rtx_vector_builder>
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28 {
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29 typedef vector_builder<rtx, rtx_vector_builder> parent;
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30 friend class vector_builder<rtx, rtx_vector_builder>;
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31
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32 public:
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33 rtx_vector_builder () : m_mode (VOIDmode) {}
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34 rtx_vector_builder (machine_mode, unsigned int, unsigned int);
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35 rtx build (rtvec);
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36 rtx build ();
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37
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38 machine_mode mode () const { return m_mode; }
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39
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40 void new_vector (machine_mode, unsigned int, unsigned int);
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41
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42 private:
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43 bool equal_p (rtx, rtx) const;
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44 bool allow_steps_p () const;
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45 bool integral_p (rtx) const;
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46 wide_int step (rtx, rtx) const;
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47 rtx apply_step (rtx, unsigned int, const wide_int &) const;
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48 bool can_elide_p (rtx) const { return true; }
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49 void note_representative (rtx *, rtx) {}
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50
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51 rtx find_cached_value ();
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52
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53 machine_mode m_mode;
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54 };
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55
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56 /* Create a new builder for a vector of mode MODE. Initially encode the
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57 value as NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements
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58 each. */
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59
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60 inline
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61 rtx_vector_builder::rtx_vector_builder (machine_mode mode,
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62 unsigned int npatterns,
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63 unsigned int nelts_per_pattern)
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64 {
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65 new_vector (mode, npatterns, nelts_per_pattern);
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66 }
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67
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68 /* Start building a new vector of mode MODE. Initially encode the value
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69 as NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements each. */
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70
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71 inline void
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72 rtx_vector_builder::new_vector (machine_mode mode, unsigned int npatterns,
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73 unsigned int nelts_per_pattern)
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74 {
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75 m_mode = mode;
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76 parent::new_vector (GET_MODE_NUNITS (mode), npatterns, nelts_per_pattern);
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77 }
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78
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79 /* Return true if elements ELT1 and ELT2 are equal. */
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80
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81 inline bool
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82 rtx_vector_builder::equal_p (rtx elt1, rtx elt2) const
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83 {
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84 return rtx_equal_p (elt1, elt2);
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85 }
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86
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87 /* Return true if a stepped representation is OK. We don't allow
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88 linear series for anything other than integers, to avoid problems
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89 with rounding. */
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90
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91 inline bool
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92 rtx_vector_builder::allow_steps_p () const
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93 {
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94 return is_a <scalar_int_mode> (GET_MODE_INNER (m_mode));
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95 }
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96
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97 /* Return true if element ELT can be interpreted as an integer. */
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98
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99 inline bool
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100 rtx_vector_builder::integral_p (rtx elt) const
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101 {
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102 return CONST_SCALAR_INT_P (elt);
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103 }
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104
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105 /* Return the value of element ELT2 minus the value of element ELT1.
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106 Both elements are known to be CONST_SCALAR_INT_Ps. */
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107
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108 inline wide_int
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109 rtx_vector_builder::step (rtx elt1, rtx elt2) const
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110 {
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111 return wi::sub (rtx_mode_t (elt2, GET_MODE_INNER (m_mode)),
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112 rtx_mode_t (elt1, GET_MODE_INNER (m_mode)));
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113 }
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114
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115 #endif
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