gcc/int-vector-builder.h

   1 /* A class for building vector integer constants.
   2    Copyright (C) 2017-2020 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_INT_VECTOR_BUILDER_H
  21 #define GCC_INT_VECTOR_BUILDER_H 1
  22
  23 #include "vector-builder.h"
  24
  25 /* This class is used to build vectors of integer type T using the same
  26    encoding as tree and rtx constants.  See vector_builder for more
  27    details.  */
  28 template<typename T>
  29 class int_vector_builder : public vector_builder<T, poly_uint64,
  30                                                  int_vector_builder<T> >
  31 {
  32   typedef vector_builder<T, poly_uint64, int_vector_builder> parent;
  33   friend class vector_builder<T, poly_uint64, int_vector_builder>;
  34
  35 public:
  36   int_vector_builder () {}
  37   int_vector_builder (poly_uint64, unsigned int, unsigned int);
  38
  39   using parent::new_vector;
  40
  41 private:
  42   bool equal_p (T, T) const;
  43   bool allow_steps_p () const { return true; }
  44   bool integral_p (T) const { return true; }
  45   T step (T, T) const;
  46   T apply_step (T, unsigned int, T) const;
  47   bool can_elide_p (T) const { return true; }
  48   void note_representative (T *, T) {}
  49
  50   static poly_uint64 shape_nelts (poly_uint64 x) { return x; }
  51 };
  52
  53 /* Create a new builder for a vector with FULL_NELTS elements.
  54    Initially encode the value as NPATTERNS interleaved patterns with
  55    NELTS_PER_PATTERN elements each.  */
  56
  57 template<typename T>
  58 inline
  59 int_vector_builder<T>::int_vector_builder (poly_uint64 full_nelts,
  60                                            unsigned int npatterns,
  61                                            unsigned int nelts_per_pattern)
  62 {
  63   new_vector (full_nelts, npatterns, nelts_per_pattern);
  64 }
  65
  66 /* Return true if elements ELT1 and ELT2 are equal.  */
  67
  68 template<typename T>
  69 inline bool
  70 int_vector_builder<T>::equal_p (T elt1, T elt2) const
  71 {
  72   return known_eq (elt1, elt2);
  73 }
  74
  75 /* Return the value of element ELT2 minus the value of element ELT1.  */
  76
  77 template<typename T>
  78 inline T
  79 int_vector_builder<T>::step (T elt1, T elt2) const
  80 {
  81   return elt2 - elt1;
  82 }
  83
  84 /* Return a vector element with the value BASE + FACTOR * STEP.  */
  85
  86 template<typename T>
  87 inline T
  88 int_vector_builder<T>::apply_step (T base, unsigned int factor, T step) const
  89 {
  90   return base + factor * step;
  91 }
  92
  93 #endif