obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
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1 files changed, 218 insertions, 0 deletions

diff --git a/gcc/lists.c b/gcc/lists.c
new file mode 100644
index 000000000..4628e68b9
--- /dev/null
+++ b/gcc/lists.c
@@ -0,0 +1,218 @@
+/* List management for the GCC expander.
+   Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
+   1999, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+   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/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "diagnostic-core.h"
+#include "rtl.h"
+#include "ggc.h"
+
+static void free_list (rtx *, rtx *);
+
+/* Functions for maintaining cache-able lists of EXPR_LIST and INSN_LISTs.  */
+
+/* An INSN_LIST containing all INSN_LISTs allocated but currently unused.  */
+static GTY ((deletable)) rtx unused_insn_list;
+
+/* An EXPR_LIST containing all EXPR_LISTs allocated but currently unused.  */
+static GTY ((deletable)) rtx unused_expr_list;
+
+/* This function will free an entire list of either EXPR_LIST, INSN_LIST
+   or DEPS_LIST nodes.  This is to be used only on lists that consist
+   exclusively of nodes of one type only.  This is only called by
+   free_EXPR_LIST_list, free_INSN_LIST_list and free_DEPS_LIST_list.  */
+static void
+free_list (rtx *listp, rtx *unused_listp)
+{
+  rtx link, prev_link;
+
+  prev_link = *listp;
+  link = XEXP (prev_link, 1);
+
+  gcc_assert (unused_listp != &unused_insn_list
+	      || GET_CODE (prev_link) == INSN_LIST);
+
+  while (link)
+    {
+      gcc_assert (unused_listp != &unused_insn_list
+		  || GET_CODE (prev_link) == INSN_LIST);
+
+      prev_link = link;
+      link = XEXP (link, 1);
+    }
+
+  XEXP (prev_link, 1) = *unused_listp;
+  *unused_listp = *listp;
+  *listp = 0;
+}
+
+/* Find corresponding to ELEM node in the list pointed to by LISTP.
+   This node must exist in the list.  Returns pointer to that node.  */
+static rtx *
+find_list_elem (rtx elem, rtx *listp)
+{
+  while (XEXP (*listp, 0) != elem)
+    listp = &XEXP (*listp, 1);
+  return listp;
+}
+
+/* Remove the node pointed to by LISTP from the list.  */
+static void
+remove_list_node (rtx *listp)
+{
+  rtx node;
+
+  node = *listp;
+  *listp = XEXP (node, 1);
+  XEXP (node, 1) = 0;
+}
+
+/* Removes corresponding to ELEM node from the list pointed to by LISTP.
+   Returns that node.  */
+rtx
+remove_list_elem (rtx elem, rtx *listp)
+{
+  rtx node;
+
+  listp = find_list_elem (elem, listp);
+  node = *listp;
+  remove_list_node (listp);
+  return node;
+}
+
+/* This call is used in place of a gen_rtx_INSN_LIST. If there is a cached
+   node available, we'll use it, otherwise a call to gen_rtx_INSN_LIST
+   is made.  */
+rtx
+alloc_INSN_LIST (rtx val, rtx next)
+{
+  rtx r;
+
+  if (unused_insn_list)
+    {
+      r = unused_insn_list;
+      unused_insn_list = XEXP (r, 1);
+      XEXP (r, 0) = val;
+      XEXP (r, 1) = next;
+      PUT_REG_NOTE_KIND (r, VOIDmode);
+
+      gcc_assert (GET_CODE (r) == INSN_LIST);
+    }
+  else
+    r = gen_rtx_INSN_LIST (VOIDmode, val, next);
+
+  return r;
+}
+
+/* This call is used in place of a gen_rtx_EXPR_LIST. If there is a cached
+   node available, we'll use it, otherwise a call to gen_rtx_EXPR_LIST
+   is made.  */
+rtx
+alloc_EXPR_LIST (int kind, rtx val, rtx next)
+{
+  rtx r;
+
+  if (unused_expr_list)
+    {
+      r = unused_expr_list;
+      unused_expr_list = XEXP (r, 1);
+      XEXP (r, 0) = val;
+      XEXP (r, 1) = next;
+      PUT_REG_NOTE_KIND (r, kind);
+    }
+  else
+    r = gen_rtx_EXPR_LIST ((enum machine_mode) kind, val, next);
+
+  return r;
+}
+
+/* This function will free up an entire list of EXPR_LIST nodes.  */
+void
+free_EXPR_LIST_list (rtx *listp)
+{
+  if (*listp == 0)
+    return;
+  free_list (listp, &unused_expr_list);
+}
+
+/* This function will free up an entire list of INSN_LIST nodes.  */
+void
+free_INSN_LIST_list (rtx *listp)
+{
+  if (*listp == 0)
+    return;
+  free_list (listp, &unused_insn_list);
+}
+
+/* This function will free up an individual EXPR_LIST node.  */
+void
+free_EXPR_LIST_node (rtx ptr)
+{
+  XEXP (ptr, 1) = unused_expr_list;
+  unused_expr_list = ptr;
+}
+
+/* This function will free up an individual INSN_LIST node.  */
+void
+free_INSN_LIST_node (rtx ptr)
+{
+  gcc_assert (GET_CODE (ptr) == INSN_LIST);
+  XEXP (ptr, 1) = unused_insn_list;
+  unused_insn_list = ptr;
+}
+
+/* Remove and free corresponding to ELEM node in the INSN_LIST pointed to
+   by LISTP.  */
+void
+remove_free_INSN_LIST_elem (rtx elem, rtx *listp)
+{
+  free_INSN_LIST_node (remove_list_elem (elem, listp));
+}
+
+/* Remove and free the first node in the INSN_LIST pointed to by LISTP.  */
+rtx
+remove_free_INSN_LIST_node (rtx *listp)
+{
+  rtx node = *listp;
+  rtx elem = XEXP (node, 0);
+
+  remove_list_node (listp);
+  free_INSN_LIST_node (node);
+
+  return elem;
+}
+
+/* Remove and free the first node in the EXPR_LIST pointed to by LISTP.  */
+rtx
+remove_free_EXPR_LIST_node (rtx *listp)
+{
+  rtx node = *listp;
+  rtx elem = XEXP (node, 0);
+
+  remove_list_node (listp);
+  free_EXPR_LIST_node (node);
+
+  return elem;
+}
+
+#include "gt-lists.h"