gcc/int-vector-builder.h

   1 /* A class for building vector integer 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_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, int_vector_builder<T> >
  30 {
  31   typedef vector_builder<T, int_vector_builder> parent;
  32   friend class vector_builder<T, int_vector_builder>;
  33
  34 public:
  35   int_vector_builder () {}
  36   int_vector_builder (poly_uint64, unsigned int, unsigned int);
  37
  38   using parent::new_vector;
  39
  40 private:
  41   bool equal_p (T, T) const;
  42   bool allow_steps_p () const { return true; }
  43   bool integral_p (T) const { return true; }
  44   T step (T, T) const;
  45   T apply_step (T, unsigned int, T) const;
  46   bool can_elide_p (T) const { return true; }
  47   void note_representative (T *, T) {}
  48 };
  49
  50 /* Create a new builder for a vector with FULL_NELTS elements.
  51    Initially encode the value as NPATTERNS interleaved patterns with
  52    NELTS_PER_PATTERN elements each.  */
  53
  54 template<typename T>
  55 inline
  56 int_vector_builder<T>::int_vector_builder (poly_uint64 full_nelts,
  57                                            unsigned int npatterns,
  58                                            unsigned int nelts_per_pattern)
  59 {
  60   new_vector (full_nelts, npatterns, nelts_per_pattern);
  61 }
  62
  63 /* Return true if elements ELT1 and ELT2 are equal.  */
  64
  65 template<typename T>
  66 inline bool
  67 int_vector_builder<T>::equal_p (T elt1, T elt2) const
  68 {
  69   return known_eq (elt1, elt2);
  70 }
  71
  72 /* Return the value of element ELT2 minus the value of element ELT1.  */
  73
  74 template<typename T>
  75 inline T
  76 int_vector_builder<T>::step (T elt1, T elt2) const
  77 {
  78   return elt2 - elt1;
  79 }
  80
  81 /* Return a vector element with the value BASE + FACTOR * STEP.  */
  82
  83 template<typename T>
  84 inline T
  85 int_vector_builder<T>::apply_step (T base, unsigned int factor, T step) const
  86 {
  87   return base + factor * step;
  88 }
  89
  90 #endif