Initial checkin of GCC 4.9.0 from trunk (r208799).

Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba

1 files changed, 60 insertions, 0 deletions

diff --git a/gcc-4.9/gcc/lower-subreg.h b/gcc-4.9/gcc/lower-subreg.h
new file mode 100644
index 000000000..8f106674d
--- /dev/null
+++ b/gcc-4.9/gcc/lower-subreg.h
@@ -0,0 +1,60 @@
+/* Target-dependent costs for lower-subreg.c.
+   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option; any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef LOWER_SUBREG_H
+#define LOWER_SUBREG_H 1
+
+/* Information about whether, and where, lower-subreg should be applied.  */
+struct lower_subreg_choices {
+  /* A boolean vector for move splitting that is indexed by mode and is
+     true for each mode that is to have its copies split.  */
+  bool move_modes_to_split[MAX_MACHINE_MODE];
+
+  /* True if zero-extensions from word_mode to twice_word_mode should
+     be split.  */
+  bool splitting_zext;
+
+  /* Index X is true if twice_word_mode shifts by X + BITS_PER_WORD
+     should be split.  */
+  bool splitting_ashift[MAX_BITS_PER_WORD];
+  bool splitting_lshiftrt[MAX_BITS_PER_WORD];
+  bool splitting_ashiftrt[MAX_BITS_PER_WORD];
+
+  /* True if there is at least one mode that is worth splitting.  */
+  bool something_to_do;
+};
+
+/* Target-specific information for the subreg lowering pass.  */
+struct target_lower_subreg {
+  /* An integer mode that is twice as wide as word_mode.  */
+  enum machine_mode x_twice_word_mode;
+
+  /* What we have decided to do when optimizing for size (index 0)
+     and speed (index 1).  */
+  struct lower_subreg_choices x_choices[2];
+};
+
+extern struct target_lower_subreg default_target_lower_subreg;
+#if SWITCHABLE_TARGET
+extern struct target_lower_subreg *this_target_lower_subreg;
+#else
+#define this_target_lower_subreg (&default_target_lower_subreg)
+#endif
+
+#endif