re PR lto/40758 ([LTO] ICE in partition_view_bitmap, at tree-ssa-live.c:331)

	PR lto/40758
	PR middle-end/41470
	* tree-ssa-coalesce.c (coalesce_ssa_name): Add only SSA names
	that are mentioned in the body.

testsuite/
	* gcc.dg/pr41470.c: New test.

From-SVN: r152203

gcc/ChangeLog

 2009-09-26  Michael Matz  <matz@suse.de>
 
+	PR lto/40758
+	PR middle-end/41470
+	* tree-ssa-coalesce.c (coalesce_ssa_name): Add only SSA names
+	that are mentioned in the body.
+
+2009-09-26  Michael Matz  <matz@suse.de>
+
 	PR tree-optimization/41454
 	* tree-ssa-dom (stmts_to_rescan): Remove variable.
 	(tree_ssa_dominator_optimize): Don't allocate and free it.

gcc/testsuite/ChangeLog

+2009-09-26  Michael Matz  <matz@suse.de>
+
+	PR lto/40758
+	PR middle-end/41470
+	* gcc.dg/pr41470.c: New test.
+
 2009-09-26  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gnat.dg/array9.adb: New test.

gcc/testsuite/gcc.dg/pr41470.c

+/* { dg-do compile } */
+/* { dg-options "-fexceptions" } */
+void *
+af (void *a)
+{
+  return a;
+}
+void
+bf (void)
+{
+  void *p;
+  {
+    int i = 1;
+    char v[i];
+    p = af (v);
+  }
+  cf (p);
+}

gcc/tree-ssa-coalesce.c

@@ -1377,7 +1377,10 @@ coalesce_ssa_name (void)
 	{
 	  tree a = ssa_name (i);
 
-	  if (a && SSA_NAME_VAR (a) && !DECL_ARTIFICIAL (SSA_NAME_VAR (a)))
+	  if (a
+	      && SSA_NAME_VAR (a)
+	      && !DECL_ARTIFICIAL (SSA_NAME_VAR (a))
+	      && (!has_zero_uses (a) || !SSA_NAME_IS_DEFAULT_DEF (a)))
 	    {
 	      tree *slot = (tree *) htab_find_slot (ssa_name_hash, a, INSERT);