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131
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1 /* A class for building vector tree 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_TREE_VECTOR_BUILDER_H
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21 #define GCC_TREE_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 tree_vector_builder : public vector_builder<tree, tree_vector_builder>
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28 {
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29 typedef vector_builder<tree, tree_vector_builder> parent;
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30 friend class vector_builder<tree, tree_vector_builder>;
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31
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32 public:
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33 tree_vector_builder () : m_type (0) {}
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34 tree_vector_builder (tree, unsigned int, unsigned int);
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35 tree build ();
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36
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37 tree type () const { return m_type; }
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38
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39 void new_vector (tree, unsigned int, unsigned int);
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40 bool new_unary_operation (tree, tree, bool);
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41 bool new_binary_operation (tree, tree, tree, bool);
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42
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43 static unsigned int binary_encoded_nelts (tree, tree);
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44
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45 private:
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46 bool equal_p (const_tree, const_tree) const;
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47 bool allow_steps_p () const;
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48 bool integral_p (const_tree) const;
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49 wide_int step (const_tree, const_tree) const;
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50 tree apply_step (tree, unsigned int, const wide_int &) const;
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51 bool can_elide_p (const_tree) const;
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52 void note_representative (tree *, tree);
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53
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54 tree m_type;
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55 };
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56
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57 /* Create a new builder for a vector of type TYPE. Initially encode the
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58 value as NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements
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59 each. */
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60
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61 inline
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62 tree_vector_builder::tree_vector_builder (tree type, 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 (type, 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 type TYPE. 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 tree_vector_builder::new_vector (tree type, unsigned int npatterns,
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73 unsigned int nelts_per_pattern)
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74 {
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75 m_type = type;
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76 parent::new_vector (TYPE_VECTOR_SUBPARTS (type), npatterns,
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77 nelts_per_pattern);
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78 }
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79
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80 /* Return true if elements I1 and I2 are equal. */
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81
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82 inline bool
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83 tree_vector_builder::equal_p (const_tree elt1, const_tree elt2) const
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84 {
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85 return operand_equal_p (elt1, elt2, 0);
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86 }
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87
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88 /* Return true if a stepped representation is OK. We don't allow
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89 linear series for anything other than integers, to avoid problems
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90 with rounding. */
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91
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92 inline bool
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93 tree_vector_builder::allow_steps_p () const
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94 {
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95 return INTEGRAL_TYPE_P (TREE_TYPE (m_type));
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96 }
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97
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98 /* Return true if ELT can be interpreted as an integer. */
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99
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100 inline bool
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101 tree_vector_builder::integral_p (const_tree elt) const
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102 {
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103 return TREE_CODE (elt) == INTEGER_CST;
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104 }
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105
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106 /* Return the value of element ELT2 minus the value of element ELT1.
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107 Both elements are known to be INTEGER_CSTs. */
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108
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109 inline wide_int
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110 tree_vector_builder::step (const_tree elt1, const_tree elt2) const
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111 {
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112 return wi::to_wide (elt2) - wi::to_wide (elt1);
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113 }
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114
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115 /* Return true if we can drop element ELT, even if the retained elements
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116 are different. Return false if this would mean losing overflow
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117 information. */
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118
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119 inline bool
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120 tree_vector_builder::can_elide_p (const_tree elt) const
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121 {
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122 return !CONSTANT_CLASS_P (elt) || !TREE_OVERFLOW (elt);
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123 }
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124
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125 /* Record that ELT2 is being elided, given that ELT1_PTR points to the last
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126 encoded element for the containing pattern. */
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127
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128 inline void
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129 tree_vector_builder::note_representative (tree *elt1_ptr, tree elt2)
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130 {
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131 if (CONSTANT_CLASS_P (elt2) && TREE_OVERFLOW (elt2))
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132 {
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133 gcc_assert (operand_equal_p (*elt1_ptr, elt2, 0));
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134 if (!TREE_OVERFLOW (elt2))
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135 *elt1_ptr = elt2;
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136 }
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137 }
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138
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139 #endif
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