re PR rtl-optimization/27735 (ICE at -O3 caused by loop unswitching)

	PR rtl-optimization/27735
	* cfgloopmanip.c (fix_loop_placements, fix_bb_placements, unloop):
	Add new argument to keep track of whether an irreducible region
	was affected.  All callers changed.
	(fix_irreducible_loops): Removed.
	(remove_path): Call mark_irreducible_loops if EDGE_IRREDUCIBLE_LOOP
	flags were invalidated.

	* gcc.dg/loop-unswitch-1.c: New test.

From-SVN: r116582

gcc/ChangeLog

+2006-08-30  Zdenek Dvorak <dvorakz@suse.cz>
+
+	PR rtl-optimization/27735
+	* cfgloopmanip.c (fix_loop_placements, fix_bb_placements, unloop):
+	Add new argument to keep track of whether an irreducible region
+	was affected.  All callers changed.
+	(fix_irreducible_loops): Removed.
+	(remove_path): Call mark_irreducible_loops if EDGE_IRREDUCIBLE_LOOP
+	flags were invalidated.
+
 2006-08-29  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* config/i386/i386.md (*fop_df_comm_mixed): Match DF operands

gcc/testsuite/ChangeLog

+2006-08-30  Zdenek Dvorak  <dvorakz@suse.cz>
+
+	PR rtl-optimization/27735
+	* gcc.dg/loop-unswitch-1.c: New test.
+
 2006-08-30  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/28885

gcc/testsuite/gcc.dg/loop-unswitch-1.c

+/* For PR rtl-optimization/27735  */
+/* { dg-do compile } */
+/* { dg-options "-O2 -funswitch-loops" } */
+
+void set_color(void);
+void xml_colorize_line(unsigned int *p, int state)
+{
+  int c;
+  switch(state) 
+    {
+    case 1:
+      goto parse_tag;
+    case 2:
+      goto parse_comment;
+    }
+
+  for(;;) 
+    {
+      c = *p;  
+      if (c == '<' && state == 0) 
+	{
+parse_comment: ;
+	  while (*p != '\n') 
+	    state = 3;
+parse_tag: ;
+	  while (*p != '\n') 
+	    state = 0;
+	  set_color();
+	}
+      else
+	p++;
+    }
+}
+