gcc/lambda-trans.c

   1 /* Lambda matrix transformations.
   2    Copyright (C) 2003, 2004, 2007, 2008, 2010 Free Software Foundation, Inc.
   3    Contributed by Daniel Berlin <dberlin@dberlin.org>.
   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 3, 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 COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "tree-flow.h"
  25 #include "lambda.h"
  26
  27 /* Allocate a new transformation matrix.  */
  28
  29 lambda_trans_matrix
  30 lambda_trans_matrix_new (int colsize, int rowsize,
  31                          struct obstack * lambda_obstack)
  32 {
  33   lambda_trans_matrix ret;
  34
  35   ret = (lambda_trans_matrix)
  36     obstack_alloc (lambda_obstack, sizeof (struct lambda_trans_matrix_s));
  37   LTM_MATRIX (ret) = lambda_matrix_new (rowsize, colsize, lambda_obstack);
  38   LTM_ROWSIZE (ret) = rowsize;
  39   LTM_COLSIZE (ret) = colsize;
  40   LTM_DENOMINATOR (ret) = 1;
  41   return ret;
  42 }
  43
  44 /* Return true if MAT is an identity matrix.  */
  45
  46 bool
  47 lambda_trans_matrix_id_p (lambda_trans_matrix mat)
  48 {
  49   if (LTM_ROWSIZE (mat) != LTM_COLSIZE (mat))
  50     return false;
  51   return lambda_matrix_id_p (LTM_MATRIX (mat), LTM_ROWSIZE (mat));
  52 }
  53
  54
  55 /* Compute the inverse of the transformation matrix MAT.  */
  56
  57 lambda_trans_matrix
  58 lambda_trans_matrix_inverse (lambda_trans_matrix mat,
  59                              struct obstack * lambda_obstack)
  60 {
  61   lambda_trans_matrix inverse;
  62   int determinant;
  63
  64   inverse = lambda_trans_matrix_new (LTM_ROWSIZE (mat), LTM_COLSIZE (mat),
  65                                      lambda_obstack);
  66   determinant = lambda_matrix_inverse (LTM_MATRIX (mat), LTM_MATRIX (inverse),
  67                                        LTM_ROWSIZE (mat), lambda_obstack);
  68   LTM_DENOMINATOR (inverse) = determinant;
  69   return inverse;
  70 }
  71
  72
  73 /* Print out a transformation matrix.  */
  74
  75 void
  76 print_lambda_trans_matrix (FILE *outfile, lambda_trans_matrix mat)
  77 {
  78   print_lambda_matrix (outfile, LTM_MATRIX (mat), LTM_ROWSIZE (mat),
  79                        LTM_COLSIZE (mat));
  80 }