re PR debug/47881 (-fcompare-debug failure (length) with -O -fno-dce -funroll-loops -fno-web)

	PR debug/47881
	* ira.c (ira): Call df_analyze again if delete_trivially_dead_insns
	removed anything.

	* gcc.dg/pr47881.c: New test.

From-SVN: r170780

gcc/ChangeLog

 2011-03-08  Jakub Jelinek  <jakub@redhat.com>
 
+	PR debug/47881
+	* ira.c (ira): Call df_analyze again if delete_trivially_dead_insns
+	removed anything.
+
 	PR tree-optimization/48022
 	* fold-const.c (fold_comparison): Don't call fold_overflow_warning
 	for EQ/NE_EXPR.

gcc/cp/ChangeLog

 2011-03-08  Dodji Seketeli  <dodji@redhat.com>
 
+	PR c++/47957
 	* name-lookup.c (binding_to_template_parms_of_scope_p): Only
 	consider scopes of primary template definitions.  Adjust comments.
 

gcc/ira.c

 /* Integrated Register Allocator (IRA) entry point.
-   Copyright (C) 2006, 2007, 2008, 2009, 2010
+   Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011
    Free Software Foundation, Inc.
    Contributed by Vladimir Makarov <vmakarov@redhat.com>.
 
@@ -3232,7 +3232,8 @@ ira (FILE *f)
     check_allocation ();
 #endif
 
-  delete_trivially_dead_insns (get_insns (), max_reg_num ());
+  if (delete_trivially_dead_insns (get_insns (), max_reg_num ()))
+    df_analyze ();
 
   init_reg_equiv_memory_loc ();
 

gcc/testsuite/ChangeLog

+2011-03-08  Jakub Jelinek  <jakub@redhat.com>
+
+	PR debug/47881
+	* gcc.dg/pr47881.c: New test.
+
 2011-03-08  Dodji Seketeli  <dodji@redhat.com>
 
+	PR c++/47957
 	* g++.dg/lookup/template3.C: New test.
 
 2011-03-08  Kai Tietz  <ktietz@redhat.com>

gcc/testsuite/gcc.dg/pr47881.c

+/* PR debug/47881 */
+/* { dg-do compile } */
+/* { dg-options "-O -fcompare-debug -fno-dce -funroll-loops -fno-web" } */
+
+extern int data[];
+
+int
+foo (int *t, int *f, int n)
+{
+  int i = 0, a, b, c, d;
+  while (data[*f] && n)
+    n--;
+  for (; i < n; i += 4)
+    {
+      a = data[*(f++) & 0x7f];
+      c = data[*(f++) & 0x7f];
+      c = data[*(f++) & 0x7f];
+      d = data[*(f++) & 0x7f];
+      if ((a & 0x80) || (b & 0x80) || (c & 0x80) || (d & 0x80))
+	return 1;
+      *(t++) = 16;
+    }
+  return 0;
+}