gcc/tree-vector-builder.c

   1 /* A class for building vector tree constants.
   2    Copyright (C) 2017-2019 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 #include "config.h"
  21 #include "system.h"
  22 #include "coretypes.h"
  23 #include "tree.h"
  24 #include "fold-const.h"
  25 #include "tree-vector-builder.h"
  26
  27 /* Return a vector element with the value BASE + FACTOR * STEP.  */
  28
  29 tree
  30 tree_vector_builder::apply_step (tree base, unsigned int factor,
  31                                  const wide_int &step) const
  32 {
  33   return wide_int_to_tree (TREE_TYPE (base),
  34                            wi::to_wide (base) + factor * step);
  35 }
  36
  37 /* Return a VECTOR_CST for the current constant.  */
  38
  39 tree
  40 tree_vector_builder::build ()
  41 {
  42   finalize ();
  43   gcc_assert (pow2p_hwi (npatterns ()));
  44   tree v = make_vector (exact_log2 (npatterns ()), nelts_per_pattern ());
  45   TREE_TYPE (v) = m_type;
  46   memcpy (VECTOR_CST_ENCODED_ELTS (v), address (),
  47           encoded_nelts () * sizeof (tree));
  48   return v;
  49 }