gcc/tree-scalar-evolution.c

   1 /* Scalar evolution detector.
   2    Copyright (C) 2003, 2004 Free Software Foundation, Inc.
   3    Contributed by Sebastian Pop <s.pop@laposte.net>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "errors.h"
  27 #include "ggc.h"
  28 #include "tree.h"
  29 #include "rtl.h"
  30 #include "basic-block.h"
  31 #include "diagnostic.h"
  32 #include "tree-flow.h"
  33 #include "tree-dump.h"
  34 #include "timevar.h"
  35 #include "cfgloop.h"
  36 #include "tree-chrec.h"
  37 #include "tree-scalar-evolution.h"
  38
  39 /* Analyze all the parameters of the chrec that were left under a
  40    symbolic form.  LOOP is the loop in which symbolic names have to
  41    be analyzed and instantiated.  */
  42
  43 tree
  44 instantiate_parameters (struct loop *loop ATTRIBUTE_UNUSED,
  45                         tree chrec)
  46 {
  47   /* Just a dummy definition for now.  */
  48   return chrec;
  49 }
  50
  51 /* Checks whether OP behaves as a simple affine iv of LOOP in STMT and returns
  52    its BASE and STEP if possible.  */
  53
  54 bool
  55 simple_iv (struct loop *loop ATTRIBUTE_UNUSED, tree stmt ATTRIBUTE_UNUSED,
  56            tree op ATTRIBUTE_UNUSED, tree *base ATTRIBUTE_UNUSED,
  57            tree *step ATTRIBUTE_UNUSED)
  58 {
  59   /* Just a dummy definition for now.  */
  60   return false;
  61 }