re PR rtl-optimization/32729 (Loop unrolling not performed with large constant loop bound)

	PR rtl-optimization/32729
	* cfghooks.c (can_duplicate_block_p): Do not forbid duplicating blocks
	that fallthru to exit.

From-SVN: r126576

gcc/ChangeLog

+2007-07-12  Zdenek Dvorak  <dvorakz@suse.cz>
+
+	PR rtl-optimization/32729
+	* cfghooks.c (can_duplicate_block_p): Do not forbid duplicating blocks
+	that fallthru to exit.
+
 2007-07-12  Kaz Kojima  <kkojima@gcc.gnu.org>
 
 	* config/sh/sh.md (symGOTOFF2reg): Add missing parenthesis.

gcc/cfghooks.c

@@ -838,8 +838,6 @@ tidy_fallthru_edges (void)
 bool
 can_duplicate_block_p (basic_block bb)
 {
-  edge e;
-
   if (!cfg_hooks->can_duplicate_block_p)
     internal_error ("%s does not support can_duplicate_block_p",
 		    cfg_hooks->name);
@@ -847,12 +845,6 @@ can_duplicate_block_p (basic_block bb)
   if (bb == EXIT_BLOCK_PTR || bb == ENTRY_BLOCK_PTR)
     return false;
 
-  /* Duplicating fallthru block to exit would require adding a jump
-     and splitting the real last BB.  */
-  e = find_edge (bb, EXIT_BLOCK_PTR);
-  if (e && (e->flags & EDGE_FALLTHRU))
-    return false;
-
   return cfg_hooks->can_duplicate_block_p (bb);
 }