[PATCH] Small cleanup in cleanup_cfg

[Marek Polacek]

I don't see any reason why we'd want to mark BBs in this case,
changed_bbs are thrown away right after fix_loop_structure
marks them.

Regtested/bootstrapped on x86_64-linux, ok for trunk?

2013-01-29  Marek Polacek  <pola...@redhat.com>

        * cfgcleanup.c (cleanup_cfg): Don't mark affected BBs.

--- gcc/cfgcleanup.c.mp 2013-01-29 13:53:21.740473075 +0100
+++ gcc/cfgcleanup.c    2013-01-29 13:53:27.942491341 +0100
@@ -3017,14 +3017,11 @@ cleanup_cfg (int mode)
       && (changed
          || (mode & CLEANUP_CFG_CHANGED)))
     {
-      bitmap changed_bbs;
       timevar_push (TV_REPAIR_LOOPS);
       /* The above doesn't preserve dominance info if available.  */
       gcc_assert (!dom_info_available_p (CDI_DOMINATORS));
       calculate_dominance_info (CDI_DOMINATORS);
-      changed_bbs = BITMAP_ALLOC (NULL);
-      fix_loop_structure (changed_bbs);
-      BITMAP_FREE (changed_bbs);
+      fix_loop_structure (NULL);
       free_dominance_info (CDI_DOMINATORS);
       timevar_pop (TV_REPAIR_LOOPS);
     }

        Marek